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CVE-2026-33023 (GCVE-0-2026-33023)

Vulnerability from nvd – Published: 2026-04-14 22:05 – Updated: 2026-04-15 20:02

Title

libsixel: Use-after-free in load_with_gdkpixbuf()

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. In versions 1.8.7 and prior, when built with the --with-gdk-pixbuf2 option, a use-after-free vulnerability exists in load_with_gdkpixbuf() in loader.c. The cleanup path manually frees the sixel_frame_t object and its internal buffers without consulting the reference count, even though the object was created via the refcounted constructor sixel_frame_new() and exposed to the public callback. A callback that calls sixel_frame_ref(frame) to retain a logically valid reference will hold a dangling pointer after sixel_helper_load_image_file() returns, and any subsequent access to the frame or its fields triggers a use-after-free confirmed by AddressSanitizer. The root cause is a consistency failure between two cleanup strategies in the same codebase: sixel_frame_unref() is used in load_with_builtin() but raw free() is used in load_with_gdkpixbuf(). An attacker supplying a crafted image to any application built against libsixel with gdk-pixbuf2 support can trigger this reliably, potentially leading to information disclosure, memory corruption, or code execution. This issue has been fixed in version 1.8.7-r1.

Severity ?

7.8 (High)


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

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

URL

Tags

	https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM
	https://github.com/saitoha/libsixel/releases/tag/…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	Affected: < 1.8.7-r1

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-33023",
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      "title": "libsixel: Use-after-free in load_with_gdkpixbuf()"
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CVE-2026-33021 (GCVE-0-2026-33021)

Vulnerability from nvd – Published: 2026-04-14 21:57 – Updated: 2026-04-16 13:54

Title

libsixel: Use-after-free in sixel_encoder_encode_bytes()

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain a use-after-free vulnerability in sixel_encoder_encode_bytes() because sixel_frame_init() stores the caller-owned pixel buffer pointer directly in frame->pixels without making a defensive copy. When a resize operation is triggered, sixel_frame_convert_to_rgb888() unconditionally frees this caller-owned buffer and replaces it with a new internal allocation, leaving the caller with a dangling pointer. Any subsequent access to the original buffer by the caller constitutes a use-after-free, confirmed by AddressSanitizer. An attacker who controls incoming frames can trigger this bug repeatedly and predictably, resulting in a reliable crash with potential for code execution. This issue has been fixed in version 1.8.7-r1.

Severity ?

7.3 (High)


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

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

URL

Tags

	https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM
	https://github.com/saitoha/libsixel/releases/tag/…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	Affected: < 1.8.7-r1

Show details on NVD website

JSON

To clipboard

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CVE-2026-33020 (GCVE-0-2026-33020)

Vulnerability from nvd – Published: 2026-04-14 21:53 – Updated: 2026-04-15 13:30

Title

libsixel: Integer Overflow in write_png_to_file() leads to Heap-based Buffer Overflow

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain an integer overflow which leads to a heap buffer overflow via sixel_frame_convert_to_rgb888() in frame.c, where allocation size and pointer offset computations for palettised images (PAL1, PAL2, PAL4) are performed using int arithmetic before casting to size_t. For images whose pixel count exceeds INT_MAX / 4, the overflow produces an undersized heap allocation for the conversion buffer and a negative pointer offset for the normalization sub-buffer, after which sixel_helper_normalize_pixelformat() writes the full image data starting from the invalid pointer, causing massive heap corruption confirmed by ASAN. An attacker providing a specially crafted large palettised PNG can corrupt the heap of the victim process, resulting in a reliable crash and potential arbitrary code execution. This issue has been fixed in version 1.8.7-r1.

Severity ?

7.1 (High)


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

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

URL

Tags

	https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM
	https://github.com/saitoha/libsixel/releases/tag/…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	Affected: < 1.8.7-r1

Show details on NVD website

JSON

To clipboard

{
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    "adp": [
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33020",
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    ],
    "cna": {
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          "product": "libsixel",
          "vendor": "saitoha",
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CVE-2026-33019 (GCVE-0-2026-33019)

Vulnerability from nvd – Published: 2026-04-14 21:49 – Updated: 2026-04-15 20:02

Title

libsixel: Integer overflow leads to Out-of-bounds Read in img2sixel

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain an integer overflow leading to an out-of-bounds heap read in the --crop option handling of img2sixel, where positive coordinates up to INT_MAX are accepted without overflow-safe bounds checking. In sixel_encoder_do_clip(), the expression clip_w + clip_x overflows to a large negative value when clip_x is INT_MAX, causing the bounds guard to be skipped entirely, and the unclamped coordinate is passed through sixel_frame_clip() to clip(), which computes a source pointer far beyond the image buffer and passes it to memmove(). An attacker supplying a specially crafted crop argument with any valid image can trigger an out-of-bounds read in the heap, resulting in a reliable crash and potential information disclosure. This issue has been fixed in version 1.8.7-r1.

Severity ?

7.1 (High)


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

CWE

CWE-125 - Out-of-bounds Read
CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

URL

Tags

	https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM
	https://github.com/saitoha/libsixel/releases/tag/…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	Affected: < 1.8.7-r1

Show details on NVD website

JSON

To clipboard

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          "vendor": "saitoha",
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        }
      ],
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            "attackComplexity": "LOW",
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CVE-2026-33018 (GCVE-0-2026-33018)

Vulnerability from nvd – Published: 2026-04-14 21:45 – Updated: 2026-04-16 13:53

Title

libsixel: Use-After-Free in load_gif()

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain a Use-After-Free vulnerability via the load_gif() function in fromgif.c, where a single sixel_frame_t object is reused across all frames of an animated GIF and gif_init_frame() unconditionally frees and reallocates frame->pixels between frames without consulting the object's reference count. Because the public API explicitly provides sixel_frame_ref() to retain a frame and sixel_frame_get_pixels() to access the raw pixel buffer, a callback following this documented usage pattern will hold a dangling pointer after the second frame is decoded, resulting in a heap use-after-free confirmed by ASAN. Any application using sixel_helper_load_image_file() with a multi-frame callback to process user-supplied animated GIFs is affected, with a reliable crash as the minimum impact and potential for code execution. This issue has been fixed in version 1.8.7-r1.

Severity ?

7 (High)


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

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

URL

Tags

	https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM
	https://github.com/saitoha/libsixel/releases/tag/…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	Affected: < 1.8.7-rc1

Show details on NVD website

JSON

To clipboard

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CVE-2025-61146 (GCVE-0-2025-61146)

Vulnerability from nvd – Published: 2026-02-23 00:00 – Updated: 2026-02-23 20:45

Summary

saitoha libsixel until v1.8.7 was discovered to contain a memory leak via the component malloc_stub.c.

Severity ?

4 (Medium)


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

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/saitoha/libsixel/issues/207
	https://github.com/saitoha/libsixel/commit/e0ba66…
	https://gist.github.com/optionGo/1100e5be05c55585…

Show details on NVD website

JSON

To clipboard

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CVE-2025-9300 (GCVE-0-2025-9300)

Vulnerability from nvd – Published: 2025-08-21 13:02 – Updated: 2025-08-21 14:46

Title

saitoha libsixel img2sixel encoder.c sixel_debug_print_palette stack-based overflow

Summary

A vulnerability was found in saitoha libsixel up to 1.10.3. Affected by this issue is the function sixel_debug_print_palette of the file src/encoder.c of the component img2sixel. The manipulation results in stack-based buffer overflow. The attack must be initiated from a local position. The exploit has been made public and could be used. The patch is identified as 316c086e79d66b62c0c4bc66229ee894e4fdb7d1. Applying a patch is advised to resolve this issue.

Severity ?

4.8 (Medium)


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

5.3 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

5.3 (Medium)


                        
                          CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

CWE

CWE-121 - Stack-based Buffer Overflow
CWE-119 - Memory Corruption

Assigner

VulDB

References

URL

Tags

	https://vuldb.com/?id.320905	vdb-entrytechnical-description
	https://vuldb.com/?ctiid.320905	signaturepermissions-required
	https://vuldb.com/?submit.632366	third-party-advisory
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	https://drive.google.com/file/d/1IIvvRFgUQZcySqeo…	exploit
	https://github.com/saitoha/libsixel/commit/316c08…	patch

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	Affected: 1.10.0 Affected: 1.10.1 Affected: 1.10.2 Affected: 1.10.3

Credits

xdcao (VulDB User)

Show details on NVD website

JSON

To clipboard

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CVE-2022-29978 (GCVE-0-2022-29978)

Vulnerability from nvd – Published: 2022-05-11 13:12 – Updated: 2024-08-03 06:40

Summary

There is a floating point exception error in sixel_encoder_do_resize, encoder.c:633 in libsixel img2sixel 1.8.6. Remote attackers could leverage this vulnerability to cause a denial-of-service via a crafted JPEG file.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/166

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2022-29977 (GCVE-0-2022-29977)

Vulnerability from nvd – Published: 2022-05-11 13:10 – Updated: 2024-08-03 06:40

Summary

There is an assertion failure error in stbi__jpeg_huff_decode, stb_image.h:1894 in libsixel img2sixel 1.8.6. Remote attackers could leverage this vulnerability to cause a denial-of-service via a crafted JPEG file.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/165

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2022-27046 (GCVE-0-2022-27046)

Vulnerability from nvd – Published: 2022-04-08 14:51 – Updated: 2024-08-03 05:18

Summary

libsixel 1.8.6 suffers from a Heap Use After Free vulnerability in in libsixel/src/dither.c:388.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/157

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2022-27044 (GCVE-0-2022-27044)

Vulnerability from nvd – Published: 2022-04-08 14:58 – Updated: 2024-08-03 05:18

Summary

libsixel 1.8.6 is affected by Buffer Overflow in libsixel/src/quant.c:876.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/156

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2022-27938 (GCVE-0-2022-27938)

Vulnerability from nvd – Published: 2022-03-26 12:49 – Updated: 2024-08-03 05:41

Summary

stb_image.h (aka the stb image loader) 2.19, as used in libsixel and other products, has a reachable assertion in stbi__create_png_image_raw.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/163

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2021-46700 (GCVE-0-2021-46700)

Vulnerability from nvd – Published: 2022-02-19 18:22 – Updated: 2024-08-04 05:17

Summary

In libsixel 1.8.6, sixel_encoder_output_without_macro (called from sixel_encoder_encode_frame in encoder.c) has a double free.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/158

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2020-21548 (GCVE-0-2020-21548)

Vulnerability from nvd – Published: 2021-09-17 20:34 – Updated: 2024-08-04 14:30

Summary

Libsixel 1.8.3 contains a heap-based buffer overflow in the sixel_encode_highcolor function in tosixel.c.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/116

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2020-21547 (GCVE-0-2020-21547)

Vulnerability from nvd – Published: 2021-09-17 20:34 – Updated: 2024-08-04 14:30

Summary

Libsixel 1.8.2 contains a heap-based buffer overflow in the dither_func_fs function in tosixel.c.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/114

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2026-33023 (GCVE-0-2026-33023)

Vulnerability from cvelistv5 – Published: 2026-04-14 22:05 – Updated: 2026-04-15 20:02

Title

libsixel: Use-after-free in load_with_gdkpixbuf()

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. In versions 1.8.7 and prior, when built with the --with-gdk-pixbuf2 option, a use-after-free vulnerability exists in load_with_gdkpixbuf() in loader.c. The cleanup path manually frees the sixel_frame_t object and its internal buffers without consulting the reference count, even though the object was created via the refcounted constructor sixel_frame_new() and exposed to the public callback. A callback that calls sixel_frame_ref(frame) to retain a logically valid reference will hold a dangling pointer after sixel_helper_load_image_file() returns, and any subsequent access to the frame or its fields triggers a use-after-free confirmed by AddressSanitizer. The root cause is a consistency failure between two cleanup strategies in the same codebase: sixel_frame_unref() is used in load_with_builtin() but raw free() is used in load_with_gdkpixbuf(). An attacker supplying a crafted image to any application built against libsixel with gdk-pixbuf2 support can trigger this reliably, potentially leading to information disclosure, memory corruption, or code execution. This issue has been fixed in version 1.8.7-r1.

Severity ?

7.8 (High)


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

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

URL

Tags

	https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM
	https://github.com/saitoha/libsixel/releases/tag/…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	Affected: < 1.8.7-r1

Show details on NVD website

JSON

To clipboard

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CVE-2026-33021 (GCVE-0-2026-33021)

Vulnerability from cvelistv5 – Published: 2026-04-14 21:57 – Updated: 2026-04-16 13:54

Title

libsixel: Use-after-free in sixel_encoder_encode_bytes()

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain a use-after-free vulnerability in sixel_encoder_encode_bytes() because sixel_frame_init() stores the caller-owned pixel buffer pointer directly in frame->pixels without making a defensive copy. When a resize operation is triggered, sixel_frame_convert_to_rgb888() unconditionally frees this caller-owned buffer and replaces it with a new internal allocation, leaving the caller with a dangling pointer. Any subsequent access to the original buffer by the caller constitutes a use-after-free, confirmed by AddressSanitizer. An attacker who controls incoming frames can trigger this bug repeatedly and predictably, resulting in a reliable crash with potential for code execution. This issue has been fixed in version 1.8.7-r1.

Severity ?

7.3 (High)


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

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

URL

Tags

	https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM
	https://github.com/saitoha/libsixel/releases/tag/…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	Affected: < 1.8.7-r1

Show details on NVD website

JSON

To clipboard

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CVE-2026-33020 (GCVE-0-2026-33020)

Vulnerability from cvelistv5 – Published: 2026-04-14 21:53 – Updated: 2026-04-15 13:30

Title

libsixel: Integer Overflow in write_png_to_file() leads to Heap-based Buffer Overflow

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain an integer overflow which leads to a heap buffer overflow via sixel_frame_convert_to_rgb888() in frame.c, where allocation size and pointer offset computations for palettised images (PAL1, PAL2, PAL4) are performed using int arithmetic before casting to size_t. For images whose pixel count exceeds INT_MAX / 4, the overflow produces an undersized heap allocation for the conversion buffer and a negative pointer offset for the normalization sub-buffer, after which sixel_helper_normalize_pixelformat() writes the full image data starting from the invalid pointer, causing massive heap corruption confirmed by ASAN. An attacker providing a specially crafted large palettised PNG can corrupt the heap of the victim process, resulting in a reliable crash and potential arbitrary code execution. This issue has been fixed in version 1.8.7-r1.

Severity ?

7.1 (High)


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

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

URL

Tags

	https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM
	https://github.com/saitoha/libsixel/releases/tag/…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	Affected: < 1.8.7-r1

Show details on NVD website

JSON

To clipboard

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CVE-2026-33019 (GCVE-0-2026-33019)

Vulnerability from cvelistv5 – Published: 2026-04-14 21:49 – Updated: 2026-04-15 20:02

Title

libsixel: Integer overflow leads to Out-of-bounds Read in img2sixel

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain an integer overflow leading to an out-of-bounds heap read in the --crop option handling of img2sixel, where positive coordinates up to INT_MAX are accepted without overflow-safe bounds checking. In sixel_encoder_do_clip(), the expression clip_w + clip_x overflows to a large negative value when clip_x is INT_MAX, causing the bounds guard to be skipped entirely, and the unclamped coordinate is passed through sixel_frame_clip() to clip(), which computes a source pointer far beyond the image buffer and passes it to memmove(). An attacker supplying a specially crafted crop argument with any valid image can trigger an out-of-bounds read in the heap, resulting in a reliable crash and potential information disclosure. This issue has been fixed in version 1.8.7-r1.

Severity ?

7.1 (High)


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

CWE

CWE-125 - Out-of-bounds Read
CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

URL

Tags

	https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM
	https://github.com/saitoha/libsixel/releases/tag/…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	Affected: < 1.8.7-r1

Show details on NVD website

JSON

To clipboard

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CVE-2026-33018 (GCVE-0-2026-33018)

Vulnerability from cvelistv5 – Published: 2026-04-14 21:45 – Updated: 2026-04-16 13:53

Title

libsixel: Use-After-Free in load_gif()

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain a Use-After-Free vulnerability via the load_gif() function in fromgif.c, where a single sixel_frame_t object is reused across all frames of an animated GIF and gif_init_frame() unconditionally frees and reallocates frame->pixels between frames without consulting the object's reference count. Because the public API explicitly provides sixel_frame_ref() to retain a frame and sixel_frame_get_pixels() to access the raw pixel buffer, a callback following this documented usage pattern will hold a dangling pointer after the second frame is decoded, resulting in a heap use-after-free confirmed by ASAN. Any application using sixel_helper_load_image_file() with a multi-frame callback to process user-supplied animated GIFs is affected, with a reliable crash as the minimum impact and potential for code execution. This issue has been fixed in version 1.8.7-r1.

Severity ?

7 (High)


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

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

URL

Tags

	https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM
	https://github.com/saitoha/libsixel/releases/tag/…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	Affected: < 1.8.7-rc1

Show details on NVD website

JSON

To clipboard

{
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CVE-2025-61146 (GCVE-0-2025-61146)

Vulnerability from cvelistv5 – Published: 2026-02-23 00:00 – Updated: 2026-02-23 20:45

Summary

saitoha libsixel until v1.8.7 was discovered to contain a memory leak via the component malloc_stub.c.

Severity ?

4 (Medium)


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

CWE

n/a

Assigner

mitre

References

URL

Tags

	https://github.com/saitoha/libsixel/issues/207
	https://github.com/saitoha/libsixel/commit/e0ba66…
	https://gist.github.com/optionGo/1100e5be05c55585…

Show details on NVD website

JSON

To clipboard

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CVE-2025-9300 (GCVE-0-2025-9300)

Vulnerability from cvelistv5 – Published: 2025-08-21 13:02 – Updated: 2025-08-21 14:46

Title

saitoha libsixel img2sixel encoder.c sixel_debug_print_palette stack-based overflow

Summary

A vulnerability was found in saitoha libsixel up to 1.10.3. Affected by this issue is the function sixel_debug_print_palette of the file src/encoder.c of the component img2sixel. The manipulation results in stack-based buffer overflow. The attack must be initiated from a local position. The exploit has been made public and could be used. The patch is identified as 316c086e79d66b62c0c4bc66229ee894e4fdb7d1. Applying a patch is advised to resolve this issue.

Severity ?

4.8 (Medium)


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

5.3 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

5.3 (Medium)


                        
                          CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

CWE

CWE-121 - Stack-based Buffer Overflow
CWE-119 - Memory Corruption

Assigner

VulDB

References

URL

Tags

	https://vuldb.com/?id.320905	vdb-entrytechnical-description
	https://vuldb.com/?ctiid.320905	signaturepermissions-required
	https://vuldb.com/?submit.632366	third-party-advisory
	https://github.com/saitoha/libsixel/issues/200	issue-tracking
	https://github.com/saitoha/libsixel/issues/200#is…	issue-tracking
	https://drive.google.com/file/d/1IIvvRFgUQZcySqeo…	exploit
	https://github.com/saitoha/libsixel/commit/316c08…	patch

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	Affected: 1.10.0 Affected: 1.10.1 Affected: 1.10.2 Affected: 1.10.3

Credits

xdcao (VulDB User)

Show details on NVD website

JSON

To clipboard

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CVE-2022-29978 (GCVE-0-2022-29978)

Vulnerability from cvelistv5 – Published: 2022-05-11 13:12 – Updated: 2024-08-03 06:40

Summary

There is a floating point exception error in sixel_encoder_do_resize, encoder.c:633 in libsixel img2sixel 1.8.6. Remote attackers could leverage this vulnerability to cause a denial-of-service via a crafted JPEG file.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/166

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2022-29977 (GCVE-0-2022-29977)

Vulnerability from cvelistv5 – Published: 2022-05-11 13:10 – Updated: 2024-08-03 06:40

Summary

There is an assertion failure error in stbi__jpeg_huff_decode, stb_image.h:1894 in libsixel img2sixel 1.8.6. Remote attackers could leverage this vulnerability to cause a denial-of-service via a crafted JPEG file.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/165

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2022-27044 (GCVE-0-2022-27044)

Vulnerability from cvelistv5 – Published: 2022-04-08 14:58 – Updated: 2024-08-03 05:18

Summary

libsixel 1.8.6 is affected by Buffer Overflow in libsixel/src/quant.c:876.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/156

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2022-27046 (GCVE-0-2022-27046)

Vulnerability from cvelistv5 – Published: 2022-04-08 14:51 – Updated: 2024-08-03 05:18

Summary

libsixel 1.8.6 suffers from a Heap Use After Free vulnerability in in libsixel/src/dither.c:388.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/157

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2022-27938 (GCVE-0-2022-27938)

Vulnerability from cvelistv5 – Published: 2022-03-26 12:49 – Updated: 2024-08-03 05:41

Summary

stb_image.h (aka the stb image loader) 2.19, as used in libsixel and other products, has a reachable assertion in stbi__create_png_image_raw.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/163

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2021-46700 (GCVE-0-2021-46700)

Vulnerability from cvelistv5 – Published: 2022-02-19 18:22 – Updated: 2024-08-04 05:17

Summary

In libsixel 1.8.6, sixel_encoder_output_without_macro (called from sixel_encoder_encode_frame in encoder.c) has a double free.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/158

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2020-21548 (GCVE-0-2020-21548)

Vulnerability from cvelistv5 – Published: 2021-09-17 20:34 – Updated: 2024-08-04 14:30

Summary

Libsixel 1.8.3 contains a heap-based buffer overflow in the sixel_encode_highcolor function in tosixel.c.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/116

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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CVE-2020-21547 (GCVE-0-2020-21547)

Vulnerability from cvelistv5 – Published: 2021-09-17 20:34 – Updated: 2024-08-04 14:30

Summary

Libsixel 1.8.2 contains a heap-based buffer overflow in the dither_func_fs function in tosixel.c.

Severity ?

No CVSS data available.

CWE

n/a

Assigner

mitre

References

URL

Tags

https://github.com/saitoha/libsixel/issues/114

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

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Search criteria ⓘ Use this form to refine search results. Full-text search supports keyword queries with ranking and filtering. You can combine vendor, product, and sources to narrow results. Enable “Apply ordering” to sort by date instead of relevance.

90 vulnerabilities found for libsixel by saitoha

CVE-2026-33023 (GCVE-0-2026-33023)

CVE-2026-33021 (GCVE-0-2026-33021)

CVE-2026-33020 (GCVE-0-2026-33020)

CVE-2026-33019 (GCVE-0-2026-33019)

CVE-2026-33018 (GCVE-0-2026-33018)

CVE-2025-61146 (GCVE-0-2025-61146)

CVE-2025-9300 (GCVE-0-2025-9300)

CVE-2022-29978 (GCVE-0-2022-29978)

CVE-2022-29977 (GCVE-0-2022-29977)

CVE-2022-27046 (GCVE-0-2022-27046)

CVE-2022-27044 (GCVE-0-2022-27044)

CVE-2022-27938 (GCVE-0-2022-27938)

CVE-2021-46700 (GCVE-0-2021-46700)

CVE-2020-21548 (GCVE-0-2020-21548)

CVE-2020-21547 (GCVE-0-2020-21547)

CVE-2026-33023 (GCVE-0-2026-33023)

CVE-2026-33021 (GCVE-0-2026-33021)

CVE-2026-33020 (GCVE-0-2026-33020)

CVE-2026-33019 (GCVE-0-2026-33019)

CVE-2026-33018 (GCVE-0-2026-33018)

CVE-2025-61146 (GCVE-0-2025-61146)

CVE-2025-9300 (GCVE-0-2025-9300)

CVE-2022-29978 (GCVE-0-2022-29978)

CVE-2022-29977 (GCVE-0-2022-29977)

CVE-2022-27044 (GCVE-0-2022-27044)

CVE-2022-27046 (GCVE-0-2022-27046)

CVE-2022-27938 (GCVE-0-2022-27938)

CVE-2021-46700 (GCVE-0-2021-46700)

CVE-2020-21548 (GCVE-0-2020-21548)

CVE-2020-21547 (GCVE-0-2020-21547)

Search criteria ⓘ Use this form to refine search results.
Full-text search supports keyword queries with ranking and filtering.
You can combine vendor, product, and sources to narrow results.
Enable “Apply ordering” to sort by date instead of relevance.