CVE-2026-44638

LowCVSS 2.5/10Last modified Oct 26, 2026

Description

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a wrong NULL check after an allocation call in sixel_decode_raw and sixel_decode causes a NULL pointer dereference whenever the allocation fails. The check tests the address of the output parameter (always non-NULL) instead of the value the malloc returned. On allocation failure, the function continues and writes through a NULL pointer, crashing the process. This is a denial of service against any caller of these public APIs that hits a low-memory condition. This vulnerability is fixed in 1.8.7-r2.

Metrics

CVSS 3.1 2.5/10CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-476 CWE-690

Affected software

Vendor	Product	Versions
saitoha	libsixel	>= 1.0.0, < 1.8.7-r2

References

https://github.com/saitoha/libsixel/security/advisories/GHSA-wpx3-h5g8-qr3wExploit, Vendor Advisory
https://github.com/saitoha/libsixel/security/advisories/GHSA-wpx3-h5g8-qr3wExploit, Vendor Advisory

Timeline

Published: May 14, 2026
Last modified: Oct 26, 2026
NVD status: Analyzed

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