CVE-2026-44638

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.

• CWE-476
• CWE-690
• CWE-476

• 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

Published

May 14, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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