Vulnerability-Lookup

OESA-2026-4654 (CVE-2026-91953)

Vulnerability from osv_openeuler – Published: 2026-10-29 09:04 – Updated: 2026-10-29 09:04 – Source website

Summary

freerdp security update

Details

FreeRDP is a client implementation of the Remote Desktop Protocol (RDP) that follows Microsoft's open specifications. This package provides the client applications xfreerdp.

Security Fix(es):

FreeRDP versions before 3.31.0 contain a heap buffer overflow vulnerability in nego_send_negotiation_request() that fails to validate the LB_LOAD_BALANCE_INFO field length before writing to a fixed 512-byte buffer. A malicious RDP server or man-in-the-middle can send a Server Redirection PDU with an oversized LB_LOAD_BALANCE_INFO value to overflow the buffer with attacker-controlled content, causing denial of service or heap corruption before authentication completes.(CVE-2026-91953)

FreeRDP before 3.31.0 contains an out-of-bounds read vulnerability in the URBDRC channel's func_get_ep_desc function that indexes interface arrays by position instead of protocol field InterfaceNumber. A malicious RDP server can send a crafted SELECT_CONFIGURATION message with permuted InterfaceNumber values to read past allocated heap memory and crash the client.(CVE-2026-91956)

FreeRDP is an implementation of the Remote Desktop Protocol (RDP) open sourced by the FreeRDP team. FreeRDP versions before 3.31.0 have a buffer error vulnerability. This vulnerability originates from buffer over-reading in the rts_read_result function in the RPC gateway transport parser. An attacker can trigger an out-of-bounds read by sending a specially crafted BIND_ACK PDU with truncated result entries, causing the process to terminate.(CVE-2026-91959)

FreeRDP versions before 3.31.0 contain an uninitialized heap memory disclosure vulnerability in the urbdrc USB redirection channel. A malicious RDP server can induce failing USB transfers to read uninitialized heap memory from the client, defeating ASLR and enabling remote code execution when chained with memory corruption vulnerabilities.(CVE-2026-91963)

FreeRDP versions before 3.31.0 contain a heap-based buffer overflow in nego_send_negotiation_request when processing Server Redirection PDU messages with attacker-controlled LoadBalanceInfo fields. A malicious RDP server can trigger the overflow by sending an arbitrary-length field that gets written to a fixed 512-byte buffer without validation, causing client crashes or potential code execution when chained with memory disclosure.(CVE-2026-91964)

Severity

8.7 (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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-91953	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-91956	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-91959	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-91963	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-91964	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "freerdp-2.11.8-11.oe2403sp1.aarch64.rpm",
          "freerdp-debuginfo-2.11.8-11.oe2403sp1.aarch64.rpm",
          "freerdp-debugsource-2.11.8-11.oe2403sp1.aarch64.rpm",
          "freerdp-devel-2.11.8-11.oe2403sp1.aarch64.rpm",
          "freerdp-help-2.11.8-11.oe2403sp1.aarch64.rpm",
          "libwinpr-2.11.8-11.oe2403sp1.aarch64.rpm",
          "libwinpr-devel-2.11.8-11.oe2403sp1.aarch64.rpm"
        ],
        "src": [
          "freerdp-2.11.8-11.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "freerdp-2.11.8-11.oe2403sp1.x86_64.rpm",
          "freerdp-debuginfo-2.11.8-11.oe2403sp1.x86_64.rpm",
          "freerdp-debugsource-2.11.8-11.oe2403sp1.x86_64.rpm",
          "freerdp-devel-2.11.8-11.oe2403sp1.x86_64.rpm",
          "freerdp-help-2.11.8-11.oe2403sp1.x86_64.rpm",
          "libwinpr-2.11.8-11.oe2403sp1.x86_64.rpm",
          "libwinpr-devel-2.11.8-11.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "freerdp",
        "purl": "pkg:rpm/openEuler/freerdp\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.11.8-11.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "FreeRDP is a client implementation of the Remote Desktop Protocol (RDP) that follows Microsoft\u0026amp;apos;s open specifications. This package provides the client applications xfreerdp.\r\n\r\nSecurity Fix(es):\n\nFreeRDP versions before 3.31.0 contain a heap buffer overflow vulnerability in nego_send_negotiation_request() that fails to validate the LB_LOAD_BALANCE_INFO field length before writing to a fixed 512-byte buffer. A malicious RDP server or man-in-the-middle can send a Server Redirection PDU with an oversized LB_LOAD_BALANCE_INFO value to overflow the buffer with attacker-controlled content, causing denial of service or heap corruption before authentication completes.(CVE-2026-91953)\n\nFreeRDP before 3.31.0 contains an out-of-bounds read vulnerability in the URBDRC channel\u0026apos;s func_get_ep_desc function that indexes interface arrays by position instead of protocol field InterfaceNumber. A malicious RDP server can send a crafted SELECT_CONFIGURATION message with permuted InterfaceNumber values to read past allocated heap memory and crash the client.(CVE-2026-91956)\n\nFreeRDP is an implementation of the Remote Desktop Protocol (RDP) open sourced by the FreeRDP team.\n FreeRDP versions before 3.31.0 have a buffer error vulnerability. This vulnerability originates from buffer over-reading in the rts_read_result function in the RPC gateway transport parser. An attacker can trigger an out-of-bounds read by sending a specially crafted BIND_ACK PDU with truncated result entries, causing the process to terminate.(CVE-2026-91959)\n\nFreeRDP versions before 3.31.0 contain an uninitialized heap memory disclosure vulnerability in the urbdrc USB redirection channel. A malicious RDP server can induce failing USB transfers to read uninitialized heap memory from the client, defeating ASLR and enabling remote code execution when chained with memory corruption vulnerabilities.(CVE-2026-91963)\n\nFreeRDP versions before 3.31.0 contain a heap-based buffer overflow in nego_send_negotiation_request when processing Server Redirection PDU messages with attacker-controlled LoadBalanceInfo fields. A malicious RDP server can trigger the overflow by sending an arbitrary-length field that gets written to a fixed 512-byte buffer without validation, causing client crashes or potential code execution when chained with memory disclosure.(CVE-2026-91964)",
  "id": "OESA-2026-4654",
  "modified": "2026-10-29T09:04:06Z",
  "published": "2026-10-29T09:04:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4654"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91953"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91956"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91959"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91963"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91964"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ],
  "summary": "freerdp security update",
  "upstream": [
    "CVE-2026-91953",
    "CVE-2026-91956",
    "CVE-2026-91959",
    "CVE-2026-91963",
    "CVE-2026-91964"
  ]
}

CVE-2026-91953 (GCVE-0-2026-91953)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-15 16:01

Title

FreeRDP before 3.31.0 Heap Buffer Overflow via LB_LOAD_BALANCE_INFO

Summary

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/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 · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 16:01 UTC

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7300 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/freerdp-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver) cpe:2.3:a:freerdp:freerdp::::::::

Date Public

2026-09-01 00:00

Show details on NVD website

JSON

To clipboard

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CVE-2026-91956 (GCVE-0-2026-91956)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-18 17:23

Title

FreeRDP before 3.31.0 Out-of-Bounds Read via URBDRC

Summary

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/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: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-18 17:15 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7300 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/freerdp-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver) cpe:2.3:a:freerdp:freerdp::::::::

Date Public

2026-09-01 00:00

Credits

Baixingyuu KeenSecurityLab

Show details on NVD website

JSON

To clipboard

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CVE-2026-91959 (GCVE-0-2026-91959)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-20 00:35

Title

FreeRDP before 3.31.0 Buffer Over-read via RTS Gateway

Summary

FreeRDP before 3.31.0 contains a buffer over-read vulnerability in the rts_read_result function within the RPC gateway transport parser. Attackers can send a malicious BIND_ACK PDU with a truncated result entry to trigger an out-of-bounds read causing process abort.

Severity

6.5 (Medium)


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

7.1 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-20 00:29 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7300 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/freerdp-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver) cpe:2.3:a:freerdp:freerdp::::::::

Date Public

2026-09-01 00:00

Credits

Nambers

Show details on NVD website

JSON

To clipboard

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CVE-2026-91963 (GCVE-0-2026-91963)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-15 15:58

Title

FreeRDP 2.0.0 through 3.30.0 Uninitialized Heap Memory Disclosure via urbdrc

Summary

Severity

7.1 (High)


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

6.5 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 15:56 UTC

CWE

CWE-457 - Use of Uninitialized Variable

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7300 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/freerdp-2.0.…	third-party-advisory

Impacted products

2 products

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 2.0.0 , < 3.0.0 (semver) Affected: 3.0.0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver)
FreeRDP	FreeRDP	Affected: 0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver)

Date Public

2026-09-01 00:00

Credits

iarce-qb

Show details on NVD website

JSON

To clipboard

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CVE-2026-91964 (GCVE-0-2026-91964)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-16 15:51

Title

FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken

Summary

Severity

8.7 (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: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-16 03:56 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7300 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/FreeRDP/FreeRDP/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/freerdp-2.0.…	third-party-advisory

Impacted products

2 products

Vendor	Product	Version
FreeRDP	FreeRDP	Affected: 2.0.0 , < 3.0.0 (semver) Affected: 3.0.0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver)
FreeRDP	FreeRDP	Affected: 0 , < 3.31.0 (semver) Unaffected: 3.31.0 (semver)

Date Public

2026-09-01 00:00

Credits

iarce-qb

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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OESA-2026-4654 (CVE-2026-91953)

CVE-2026-91953 (GCVE-0-2026-91953)

CVE-2026-91956 (GCVE-0-2026-91956)

CVE-2026-91959 (GCVE-0-2026-91959)

CVE-2026-91963 (GCVE-0-2026-91963)

CVE-2026-91964 (GCVE-0-2026-91964)

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