Vulnerability in Dlbeer Quirc
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.
Published .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/dlbeer/quirc/pull/159 (issue-tracking, patch)
- github.com/dlbeer/quirc/issues/162 (issue-tracking)
- hackmd.io/@haind-pwn/quirc-alignment-pattern-infinite-loop-dos (third-party-advisory)
- github.com/dlbeer/quirc/blob/542848dd6b9b0eaa9587bbf25b9bc67bd8a71fca/lib/ident… (technical-description)
- www.vulncheck.com/advisories/quirc-through-1.2-denial-of-service-via-find-align… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110596?
- CVE-2026-110596 is a medium-severity vulnerability in Dlbeer Quirc, classified under Excessive Iteration. CVSS score: 5.5/10. Published 2026-10-14.
- How severe is CVE-2026-110596?
- Medium severity. CVSS v3 base score is 5.5 out of 10.