CVE-2026-121942

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.

References

• https://github.com/mchehab/zbar/blob/0.23.95/zbar/sqcode.c#L529-L567
• https://github.com/mchehab/zbar/issues/351
• https://hackmd.io/@haindpwn/zbar-sqcode-sampling-oob-read
• https://www.vulncheck.com/advisories/zbar-through-0.23.95-out-of-bounds-read-via-zbar-sq-decode-in-sqcode-c
• https://hackmd.io/@haindpwn/cve-2026-121942-zbar-sqcode-sampling-oob-read