What’s Vulnerable › Vulnerabilities

CVE-2026-110596: quirc through 1.2 Denial of Service via find_alignment_pattern Spiral Search

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-20
• Weakness: CWE-834

Description

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.

Affected products

• dlbeer quirc: through 1.2

References

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

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