CVE-2026-121942 ZBar through 0.23.95 Out-of-Bounds Read via _zbar_sq_decode() in sqcode.c
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-121942?
CVE-2026-121942 is a medium-severity vulnerability in mchehab zbar, published on 4 Nov 2026.
Official description
ZBar through 0.23.95 contains an out-of-bounds read vulnerability in _zbar_sq_decode() in zbar/sqcode.c that allows attackers to read heap memory outside the image buffer via crafted SQ code images. Attackers can supply an image with a skewed SQ code finder pattern near the edge, producing unchecked sample coordinates that crash the decoder and leak bytes into output.
Weakness: CWE-125
Which versions are affected by CVE-2026-121942?
How do I fix CVE-2026-121942?
No fix has been published for CVE-2026-121942 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-121942 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-121942 exists.
Sources
Also known as DEBIAN-CVE-2026-121942, ECHO-602a-474e-847a, GHSA-mcxw-xh39-2qjq, UBUNTU-CVE-2026-121942.