CVE-2025-9300: libsixel Buffer Overflow

Description

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.

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CVSS v3.1 Score

5.3

MEDIUM

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

Weakness Type (CWE)

CWE-119 Buffer Overflow

CWE-121 CWE-121

CWE-787 Out-of-bounds Write

Affected Products

Vendor	Product	Versions
saitoha	libsixel	< 1.8.7

References

Advisories & Patches

https://github.com/saitoha/libsixel/commit/316c086e79d66b62c0c4bc66229ee894e4fdb7d1 https://github.com/saitoha/libsixel/commit/316c086e79d66b62c0c4bc66229ee894e4fdb7d1

Exploits

https://drive.google.com/file/d/1IIvvRFgUQZcySqeoqXXhsxd0HZCjClJ7/view?usp=sharing https://github.com/saitoha/libsixel/issues/200 https://github.com/saitoha/libsixel/issues/200#issuecomment-3178785635 https://vuldb.com/?submit.632366 https://github.com/saitoha/libsixel/issues/200 https://github.com/saitoha/libsixel/issues/200#issuecomment-3178785635 https://vuldb.com/?submit.632366

Other References

https://vuldb.com/?ctiid.320905 https://vuldb.com/?id.320905

Frequently Asked Questions

What is CVE-2025-9300? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-9300? +

CVE-2025-9300 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-9300? +

CVE-2025-9300 affects products from saitoha, specifically: libsixel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-9300? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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