Vulnerability Description
The GUIX JPEG software decoder enforces no ordering on JPEG markers. A file that places a second `SOF0` frame header after `SOS` re-runs the frame header parser after the output buffer has already been allocated and its geometry latched. The decoder returns `GX_SUCCESS` and publishes a `GX_PIXELMAP` whose reported dimensions and `data_size` exceed the allocation behind it. Any consumer that trusts the returned structure reads out of bounds, including GUIX's own display drivers, reached through the ordinary draw path. Reproduces in the shipped default configuration; `GX_SOFTWARE_DECODER_SUPPORT` is enabled by default.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-91059?
CVE-2026-91059 is a documented vulnerability. The GUIX JPEG software decoder enforces no ordering on JPEG markers. A file that places a second `SOF0` frame header after `SOS` re-runs the frame header parser after the output buffer has already bee...
How severe is CVE-2026-91059?
CVSS scoring is not yet available for CVE-2026-91059. Check NVD for updates.
Is there a patch for CVE-2026-91059?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.