CVE-2026-110596

quirc through 1.2 contains an excessive-iteration vulnerability in find_alignment_pattern() in lib/identify.c that allows attackers to hang quirc_end() with a crafted image. Attackers can arrange three finder patterns producing a near-degenerate perspective transform, causing billions of region_code() iterations that exhaust CPU in applications decoding attacker-supplied QR images.

Score

CVSS 4.0 6.8 Medium

Status

Deferred - disclosure@vulncheck.com

Published

2026-10-14

Last modified

2026-10-20

Weaknesses

CWE-834

Affected products

• Quirc (Dlbeer)

References

• https://github.com/dlbeer/quirc/pull/159
• https://github.com/dlbeer/quirc/issues/162
• https://hackmd.io/@haind-pwn/quirc-alignment-pattern-infinite-loop-dos
• https://github.com/dlbeer/quirc/blob/542848dd6b9b0eaa9587bbf25b9bc67bd8a71fca/lib/identify.c#L578-L636
• https://www.vulncheck.com/advisories/quirc-through-1.2-denial-of-service-via-find-alignment-pattern-spiral-search