CVE-2026-91059 JPEG decoder: a duplicate SOF0 after SOS publishes a pixelmap that misreports its own allocation size
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-91059?
CVE-2026-91059 is a medium-severity vulnerability in Eclipse ThreadX - GUIX, published on 20 Oct 2026.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-91059?
How do I fix CVE-2026-91059?
No fix has been published for CVE-2026-91059 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-91059 being exploited?
There is no known exploitation of CVE-2026-91059 in the wild and no public exploit code.
Sources
Also known as GHSA-cxf2-pgvg-pcw3.