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CVE-2026-45700 (GCVE-0-2026-45700)

Vulnerability from nvd – Published: 2026-05-29 19:44 – Updated: 2026-06-02 03:55

Title

Heap-buffer-overflow write in planar bitmap decoder

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's planar bitmap decoder has an out-of-bounds heap write when decoding RLE planar data. In libfreerdp/codec/planar.c, freerdp_bitmap_decompress_planar() validates the X destination coordinate nXDst against the caller-provided destination stride (nDstStep) even when it is writing into the internal temp buffer pTempData. An attacker can bypass the check with a large nDstStep and a large nXDst, causing planar_decompress_plane_rle() to write past the end of pTempData. This vulnerability is fixed in 3.26.0.

Severity

7.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-787 - Out-of-bounds Write

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.26.0

Show details on NVD website

JSON

To clipboard

{
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                "id": "CVE-2026-45700",
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CVE-2026-44422 (GCVE-0-2026-44422)

Vulnerability from nvd – Published: 2026-05-29 19:41 – Updated: 2026-06-02 03:55

Title

FreeRDP RDPEAR NDR ref-id aliasing causes client-side UAF/double-free and type confusion

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's RDPEAR NDR parser accepts one non-null NDR pointer ref-id for multiple logical pointer fields without tracking the pointed object's expected NDR type or ownership. When the same ref-id is reused across two pointer fields, the parser assigns the same heap object to both output fields. The generic destructor later walks each field independently and destroys/frees both pointers. This causes a malicious-server-triggerable heap use-after-free / double-free in the FreeRDP client's RDPEAR authentication-redirection path. This vulnerability is fixed in 3.26.0.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free
CWE-415 - Double Free

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.26.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-44421 (GCVE-0-2026-44421)

Vulnerability from nvd – Published: 2026-05-29 19:40 – Updated: 2026-06-02 03:55

Title

FreeRDP RDPGFX CacheToSurface heap-buffer-overflow via clamped-rectangle validation bypass

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. This vulnerability is fixed in 3.26.0.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.26.0

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-44421",
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CVE-2026-44420 (GCVE-0-2026-44420)

Vulnerability from nvd – Published: 2026-05-29 19:42 – Updated: 2026-06-02 03:55

Title

FreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_CAPS

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP's server-side clipboard (cliprdr) channel by sending a CB_CLIP_CAPS PDU with a too-small capabilitySetLength. This can crash the server process (remote DoS) and may be exploitable for code execution because it corrupts heap memory. This vulnerability is fixed in 3.26.0.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/yhirose/cpp-httplib/security/a…	exploit

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.26.0

Show details on NVD website

JSON

To clipboard

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          ],
          "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mvpx-xj7r-3p3r"
        }
      ],
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  },
  "dataType": "CVE_RECORD",
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}

CVE-2026-40033 (GCVE-0-2026-40033)

Vulnerability from nvd – Published: 2026-05-26 14:08 – Updated: 2026-05-27 03:55

Title

FreeRDP - Heap-buffer-overflow in gdi_CacheToSurface via rectangle validation bypass

Summary

FreeRDP before 3.26.0 contains a heap-buffer-overflow vulnerability in gdi_CacheToSurface that allows remote attackers to write out-of-bounds heap memory. The vulnerability occurs because rectangle validation clamps coordinates to UINT16_MAX but performs copy operations using unclamped cache entry dimensions, enabling malicious RDP servers to trigger large out-of-bounds writes and potentially achieve remote code execution or client crash.

Severity

8.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

VulnCheck

References

3 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://github.com/FreeRDP/FreeRDP/commit/23b36cd…	patch
https://www.vulncheck.com/advisories/freerdp-heap…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 0 , < 3.26.0 (semver) Unaffected: 3.26.0 (semver)

Date Public

2026-05-12 00:00

Credits

kevin-valerio

Show details on NVD website

JSON

To clipboard

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CVE-2026-40254 (GCVE-0-2026-40254)

Vulnerability from nvd – Published: 2026-04-24 02:24 – Updated: 2026-04-24 12:06

Title

FreeRDP: contains_dotdot() off-by-one allows drive channel path traversal via terminal ..

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Versions prior to 3.25.0 have an off-by-one in the path traversal filter in `channels/drive/client/drive_file.c`. The `contains_dotdot()` function catches `../` and `..\` mid-path but misses `..` when it's the last component with no trailing separator. A rogue RDP server can read, list, or write files one directory above the client's shared folder through RDPDR requests. This requires the victim to connect with drive redirection enabled. Version 3.25.0 patches the issue.

Severity

4.2 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-193 - Off-by-one Error

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.25.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-33995 (GCVE-0-2026-33995)

Vulnerability from nvd – Published: 2026-03-30 21:43 – Updated: 2026-04-02 14:13

Title

FreeRDP: Possible double free in kerberos_AcceptSecurityContext

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a double-free vulnerability in kerberos_AcceptSecurityContext() and kerberos_InitializeSecurityContextA() (WinPR, winpr/libwinpr/sspi/Kerberos/kerberos.c) can cause a crash in any FreeRDP clients on systems where Kerberos and/or Kerberos U2U is configured (Samba AD member, or krb5 for NFS). The crash is triggered during NLA connection teardown and requires a failed authentication attempt. This issue has been patched in version 3.24.2.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-415 - Double Free

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/8078b8a…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-33987 (GCVE-0-2026-33987)

Vulnerability from nvd – Published: 2026-03-30 21:43 – Updated: 2026-03-31 15:32

Title

FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in persistent_cache_read_entry_v3() in libfreerdp/cache/persistent.c, persistent->bmpSize is updated before winpr_aligned_recalloc(). If realloc fails, bmpSize is inflated while bmpData points to the old buffer. This issue has been patched in version 3.24.2.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/1a890eb…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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    "cveId": "CVE-2026-33987",
    "datePublished": "2026-03-30T21:43:39.943Z",
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CVE-2026-33986 (GCVE-0-2026-33986)

Vulnerability from nvd – Published: 2026-03-30 21:43 – Updated: 2026-04-01 03:55

Title

FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in yuv_ensure_buffer() in libfreerdp/codec/h264.c, h264->width and h264->height are updated before the reallocation loop. If any winpr_aligned_recalloc() call fails, the function returns FALSE but width/height are already inflated. This issue has been patched in version 3.24.2.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/f6e43e2…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-33985 (GCVE-0-2026-33985)

Vulnerability from nvd – Published: 2026-03-30 21:43 – Updated: 2026-03-31 18:53

Title

FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, pixel data from adjacent heap memory is rendered to screen, potentially leaking sensitive data to the attacker. This issue has been patched in version 3.24.2.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/c49d1ad…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-33985",
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CVE-2026-33984 (GCVE-0-2026-33984)

Vulnerability from nvd – Published: 2026-03-30 21:42 – Updated: 2026-04-02 12:57

Title

FreeRDP: ClearCodec resize_vbar_entry() Heap OOB Write

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in resize_vbar_entry() in libfreerdp/codec/clear.c, vBarEntry->size is updated to vBarEntry->count before the winpr_aligned_recalloc() call. If realloc fails, size is inflated while pixels still points to the old, smaller buffer. On a subsequent call where count <= size (the inflated value), realloc is skipped. The caller then writes count * bpp bytes of attacker-controlled pixel data into the undersized buffer, causing a heap buffer overflow. This issue has been patched in version 3.24.2.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/dc7fdb1…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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        "metrics": [
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                "id": "CVE-2026-33984",
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          ],
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CVE-2026-33983 (GCVE-0-2026-33983)

Vulnerability from nvd – Published: 2026-03-30 21:42 – Updated: 2026-03-31 15:32

Title

FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, progressive_decompress_tile_upgrade() detects a mismatch via progressive_rfx_quant_cmp_equal() but only emits WLog_WARN, execution continues. The wrapped value (247) is used as a shift exponent, causing undefined behavior and an approximately 80 billion iteration loop (CPU DoS). This issue has been patched in version 3.24.2.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-190 - Integer Overflow or Wraparound
CWE-252 - Unchecked Return Value

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/78188ab…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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      {
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                "id": "CVE-2026-33983",
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      ],
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          ],
          "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4gfm-4p52-h478"
        },
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CVE-2026-33982 (GCVE-0-2026-33982)

Vulnerability from nvd – Published: 2026-03-30 21:42 – Updated: 2026-03-31 14:07

Title

FreeRDP: Persistent Cache Allocator Mismatch - Heap OOB Read

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, there is a heap-buffer-overflow READ vulnerability at 24 bytes before the allocation, in winpr_aligned_offset_recalloc(). This issue has been patched in version 3.24.2.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/a48dbde…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-33977 (GCVE-0-2026-33977)

Vulnerability from nvd – Published: 2026-03-30 21:41 – Updated: 2026-03-31 19:09

Title

FreeRDP: DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a malicious RDP server can crash the FreeRDP client by sending audio data in IMA ADPCM format with an invalid initial step index value (>= 89). The unvalidated step index is read directly from the network and used to index into a 89-entry lookup table, triggering a WINPR_ASSERT() failure and process abort via SIGABRT. This affects any FreeRDP client that has audio redirection (RDPSND) enabled, which is the default configuration. This issue has been patched in version 3.24.2.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-617 - Reachable Assertion

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/9be3f03…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-33952 (GCVE-0-2026-33952)

Vulnerability from nvd – Published: 2026-03-30 21:42 – Updated: 2026-04-02 14:11

Title

FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, an unvalidated auth_length field read from the network triggers a WINPR_ASSERT() failure in rts_read_auth_verifier_no_checks(), causing any FreeRDP client connecting through a malicious RDP Gateway to crash with SIGABRT. This is a pre-authentication denial of service affecting all FreeRDP clients using RPC-over-HTTP gateway transport. The assertion is active in default release builds (WITH_VERBOSE_WINPR_ASSERT=ON). This issue has been patched in version 3.24.2.

Severity

6 (Medium)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-617 - Reachable Assertion

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/4ac0b64…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-45700 (GCVE-0-2026-45700)

Vulnerability from cvelistv5 – Published: 2026-05-29 19:44 – Updated: 2026-06-02 03:55

Title

Heap-buffer-overflow write in planar bitmap decoder

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's planar bitmap decoder has an out-of-bounds heap write when decoding RLE planar data. In libfreerdp/codec/planar.c, freerdp_bitmap_decompress_planar() validates the X destination coordinate nXDst against the caller-provided destination stride (nDstStep) even when it is writing into the internal temp buffer pTempData. An attacker can bypass the check with a large nDstStep and a large nXDst, causing planar_decompress_plane_rle() to write past the end of pTempData. This vulnerability is fixed in 3.26.0.

Severity

7.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-787 - Out-of-bounds Write

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.26.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-44420 (GCVE-0-2026-44420)

Vulnerability from cvelistv5 – Published: 2026-05-29 19:42 – Updated: 2026-06-02 03:55

Title

FreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_CAPS

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP's server-side clipboard (cliprdr) channel by sending a CB_CLIP_CAPS PDU with a too-small capabilitySetLength. This can crash the server process (remote DoS) and may be exploitable for code execution because it corrupts heap memory. This vulnerability is fixed in 3.26.0.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/yhirose/cpp-httplib/security/a…	exploit

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.26.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-44422 (GCVE-0-2026-44422)

Vulnerability from cvelistv5 – Published: 2026-05-29 19:41 – Updated: 2026-06-02 03:55

Title

FreeRDP RDPEAR NDR ref-id aliasing causes client-side UAF/double-free and type confusion

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, FreeRDP's RDPEAR NDR parser accepts one non-null NDR pointer ref-id for multiple logical pointer fields without tracking the pointed object's expected NDR type or ownership. When the same ref-id is reused across two pointer fields, the parser assigns the same heap object to both output fields. The generic destructor later walks each field independently and destroys/frees both pointers. This causes a malicious-server-triggerable heap use-after-free / double-free in the FreeRDP client's RDPEAR authentication-redirection path. This vulnerability is fixed in 3.26.0.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free
CWE-415 - Double Free

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.26.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-44421 (GCVE-0-2026-44421)

Vulnerability from cvelistv5 – Published: 2026-05-29 19:40 – Updated: 2026-06-02 03:55

Title

FreeRDP RDPGFX CacheToSurface heap-buffer-overflow via clamped-rectangle validation bypass

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client by sending crafted RDPGFX PDUs. The bug is in gdi_CacheToSurface: it validates a destination rectangle that is clamped to UINT16_MAX, but then performs the copy using the original cacheEntry->width/height. This can cause a large out-of-bounds heap write and may lead to client crashes or code execution. This bug is reachable from a malicious RDP server, but only when the client has RDPGFX enabled. This vulnerability is fixed in 3.26.0.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.26.0

Show details on NVD website

JSON

To clipboard

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CVE-2026-40033 (GCVE-0-2026-40033)

Vulnerability from cvelistv5 – Published: 2026-05-26 14:08 – Updated: 2026-05-27 03:55

Title

FreeRDP - Heap-buffer-overflow in gdi_CacheToSurface via rectangle validation bypass

Summary

FreeRDP before 3.26.0 contains a heap-buffer-overflow vulnerability in gdi_CacheToSurface that allows remote attackers to write out-of-bounds heap memory. The vulnerability occurs because rectangle validation clamps coordinates to UINT16_MAX but performs copy operations using unclamped cache entry dimensions, enabling malicious RDP servers to trigger large out-of-bounds writes and potentially achieve remote code execution or client crash.

Severity

8.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

VulnCheck

References

3 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://github.com/FreeRDP/FreeRDP/commit/23b36cd…	patch
https://www.vulncheck.com/advisories/freerdp-heap…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 0 , < 3.26.0 (semver) Unaffected: 3.26.0 (semver)

Date Public

2026-05-12 00:00

Credits

kevin-valerio

Show details on NVD website

JSON

To clipboard

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          "name": "GHSA Advisory GHSA-p6r2-4hgm-m6ff",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-p6r2-4hgm-m6ff"
        },
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          "name": "https://github.com/FreeRDP/FreeRDP/commit/23b36cd00ebf0ccd97750fcdbc9aa2f362352da7",
          "tags": [
            "patch"
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        {
          "name": "VulnCheck Advisory: FreeRDP - Heap-buffer-overflow in gdi_CacheToSurface via rectangle validation bypass",
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          ],
          "url": "https://www.vulncheck.com/advisories/freerdp-heap-buffer-overflow-in-gdi-cachetosurface-via-rectangle-validation-bypass"
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    "datePublished": "2026-05-26T14:08:47.535Z",
    "dateReserved": "2026-04-08T13:36:55.304Z",
    "dateUpdated": "2026-05-27T03:55:40.563Z",
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  },
  "dataType": "CVE_RECORD",
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CVE-2026-40254 (GCVE-0-2026-40254)

Vulnerability from cvelistv5 – Published: 2026-04-24 02:24 – Updated: 2026-04-24 12:06

Title

FreeRDP: contains_dotdot() off-by-one allows drive channel path traversal via terminal ..

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Versions prior to 3.25.0 have an off-by-one in the path traversal filter in `channels/drive/client/drive_file.c`. The `contains_dotdot()` function catches `../` and `..\` mid-path but misses `..` when it's the last component with no trailing separator. A rogue RDP server can read, list, or write files one directory above the client's shared folder through RDPDR requests. This requires the victim to connect with drive redirection enabled. Version 3.25.0 patches the issue.

Severity

4.2 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-193 - Off-by-one Error

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.25.0

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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CVE-2026-33995 (GCVE-0-2026-33995)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:43 – Updated: 2026-04-02 14:13

Title

FreeRDP: Possible double free in kerberos_AcceptSecurityContext

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a double-free vulnerability in kerberos_AcceptSecurityContext() and kerberos_InitializeSecurityContextA() (WinPR, winpr/libwinpr/sspi/Kerberos/kerberos.c) can cause a crash in any FreeRDP clients on systems where Kerberos and/or Kerberos U2U is configured (Samba AD member, or krb5 for NFS). The crash is triggered during NLA connection teardown and requires a failed authentication attempt. This issue has been patched in version 3.24.2.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-415 - Double Free

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/8078b8a…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-33987 (GCVE-0-2026-33987)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:43 – Updated: 2026-03-31 15:32

Title

FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in persistent_cache_read_entry_v3() in libfreerdp/cache/persistent.c, persistent->bmpSize is updated before winpr_aligned_recalloc(). If realloc fails, bmpSize is inflated while bmpData points to the old buffer. This issue has been patched in version 3.24.2.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/1a890eb…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

{
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      {
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CVE-2026-33986 (GCVE-0-2026-33986)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:43 – Updated: 2026-04-01 03:55

Title

FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in yuv_ensure_buffer() in libfreerdp/codec/h264.c, h264->width and h264->height are updated before the reallocation loop. If any winpr_aligned_recalloc() call fails, the function returns FALSE but width/height are already inflated. This issue has been patched in version 3.24.2.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/f6e43e2…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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      "source": {
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        "discovery": "UNKNOWN"
      },
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    }
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CVE-2026-33985 (GCVE-0-2026-33985)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:43 – Updated: 2026-03-31 18:53

Title

FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, pixel data from adjacent heap memory is rendered to screen, potentially leaking sensitive data to the attacker. This issue has been patched in version 3.24.2.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/c49d1ad…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-33984 (GCVE-0-2026-33984)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:42 – Updated: 2026-04-02 12:57

Title

FreeRDP: ClearCodec resize_vbar_entry() Heap OOB Write

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in resize_vbar_entry() in libfreerdp/codec/clear.c, vBarEntry->size is updated to vBarEntry->count before the winpr_aligned_recalloc() call. If realloc fails, size is inflated while pixels still points to the old, smaller buffer. On a subsequent call where count <= size (the inflated value), realloc is skipped. The caller then writes count * bpp bytes of attacker-controlled pixel data into the undersized buffer, causing a heap buffer overflow. This issue has been patched in version 3.24.2.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/dc7fdb1…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-33983 (GCVE-0-2026-33983)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:42 – Updated: 2026-03-31 15:32

Title

FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, progressive_decompress_tile_upgrade() detects a mismatch via progressive_rfx_quant_cmp_equal() but only emits WLog_WARN, execution continues. The wrapped value (247) is used as a shift exponent, causing undefined behavior and an approximately 80 billion iteration loop (CPU DoS). This issue has been patched in version 3.24.2.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-190 - Integer Overflow or Wraparound
CWE-252 - Unchecked Return Value

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/78188ab…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-33982 (GCVE-0-2026-33982)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:42 – Updated: 2026-03-31 14:07

Title

FreeRDP: Persistent Cache Allocator Mismatch - Heap OOB Read

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, there is a heap-buffer-overflow READ vulnerability at 24 bytes before the allocation, in winpr_aligned_offset_recalloc(). This issue has been patched in version 3.24.2.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/a48dbde…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-33952 (GCVE-0-2026-33952)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:42 – Updated: 2026-04-02 14:11

Title

FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, an unvalidated auth_length field read from the network triggers a WINPR_ASSERT() failure in rts_read_auth_verifier_no_checks(), causing any FreeRDP client connecting through a malicious RDP Gateway to crash with SIGABRT. This is a pre-authentication denial of service affecting all FreeRDP clients using RPC-over-HTTP gateway transport. The assertion is active in default release builds (WITH_VERBOSE_WINPR_ASSERT=ON). This issue has been patched in version 3.24.2.

Severity

6 (Medium)


                        
                          CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-617 - Reachable Assertion

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/4ac0b64…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

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              "attackVector": "NETWORK",
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              "baseScore": 6.5,
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              "confidentialityImpact": "NONE",
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              "scope": "UNCHANGED",
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            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
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          "descriptions": [
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          "name": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4v4p-9v5x-hc93",
          "tags": [
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      "source": {
        "advisory": "GHSA-4v4p-9v5x-hc93",
        "discovery": "UNKNOWN"
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      "title": "FreeRDP: DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks"
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CVE-2026-33977 (GCVE-0-2026-33977)

Vulnerability from cvelistv5 – Published: 2026-03-30 21:41 – Updated: 2026-03-31 19:09

Title

FreeRDP: DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a malicious RDP server can crash the FreeRDP client by sending audio data in IMA ADPCM format with an invalid initial step index value (>= 89). The unvalidated step index is read directly from the network and used to index into a 89-entry lookup table, triggering a WINPR_ASSERT() failure and process abort via SIGABRT. This affects any FreeRDP client that has audio redirection (RDPSND) enabled, which is the default configuration. This issue has been patched in version 3.24.2.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-617 - Reachable Assertion

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/9be3f03…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: < 3.24.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
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                "id": "CVE-2026-33977",
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                "role": "CISA Coordinator",
                "timestamp": "2026-03-31T18:38:45.941200Z",
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            "tags": [
              "exploit"
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            "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8f2g-3q27-6xm5"
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        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "product": "FreeRDP",
          "vendor": "FreeRDP",
          "versions": [
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            }
          ]
        }
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        {
          "lang": "en",
          "value": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a malicious RDP server can crash the FreeRDP client by sending audio data in IMA ADPCM format with an invalid initial step index value (\u003e= 89). The unvalidated step index is read directly from the network and used to index into a 89-entry lookup table, triggering a WINPR_ASSERT() failure and process abort via SIGABRT. This affects any FreeRDP client that has audio redirection (RDPSND) enabled, which is the default configuration. This issue has been patched in version 3.24.2."
        }
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Search criteria

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CVE-2026-33985 (GCVE-0-2026-33985)

CVE-2026-33984 (GCVE-0-2026-33984)

CVE-2026-33983 (GCVE-0-2026-33983)

CVE-2026-33982 (GCVE-0-2026-33982)

CVE-2026-33977 (GCVE-0-2026-33977)

CVE-2026-33952 (GCVE-0-2026-33952)

CVE-2026-45700 (GCVE-0-2026-45700)

CVE-2026-44420 (GCVE-0-2026-44420)

CVE-2026-44422 (GCVE-0-2026-44422)

CVE-2026-44421 (GCVE-0-2026-44421)

CVE-2026-40033 (GCVE-0-2026-40033)

CVE-2026-40254 (GCVE-0-2026-40254)

CVE-2026-33995 (GCVE-0-2026-33995)

CVE-2026-33987 (GCVE-0-2026-33987)

CVE-2026-33986 (GCVE-0-2026-33986)

CVE-2026-33985 (GCVE-0-2026-33985)

CVE-2026-33984 (GCVE-0-2026-33984)

CVE-2026-33983 (GCVE-0-2026-33983)

CVE-2026-33982 (GCVE-0-2026-33982)

CVE-2026-33952 (GCVE-0-2026-33952)

CVE-2026-33977 (GCVE-0-2026-33977)