libsixel: libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel
CVE-2026-44638 is fixed in libsixel on 1 platform by DEBIAN-CVE-2026-44638 (version 1:1.8.7-r2-1), released May 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libsixel · Debian 14 | 1:1.8.7-r2-1 | DEBIAN-CVE-2026-44638 | May 27, 2026 |
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