CVE-2026-91059
JPEG decoder: a duplicate SOF0 after SOS publishes a pixelmap that misreports its own allocation size
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Active
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
JPEG decoder: a duplicate SOF0 after SOS publishes a pixelmap that misreports its own allocation size
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.
- Record
CVE-2026-91059- CVSS 4.0
- 6.8 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N - Weakness
- CWE-125
- Updated
- 2026-11-02
EUVDEUVD-2026-105042
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.
- Record
EUVD-2026-105042- CVSS 4.0
- 6.8 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N - Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-91059- CVSS 4.0
- 6.8 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Weakness
- CWE-125
- Updated
- 2026-11-02
OSV
JPEG decoder: a duplicate SOF0 after SOS publishes a pixelmap that misreports its own allocation size
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.
- Record
CVE-2026-91059- CVSS 4.0
- 6.8 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N - Weakness
- CWE-125
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-91059 is a medium vulnerability (CVSS 6.8) in Eclipse Foundation Threadx - Guix, published October 20, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.16%, the 5th percentile. No source names a fixed version.