Medium severity · published Oct 14, 2026
CVE-2026-110596
quirc through 1.2 Denial of Service via find_alignment_pattern Spiral Search
5.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QU
quirc · dlbeer
through 1.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-110596
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-110596
issue-tracking
https://github.com/dlbeer/quirc/pull/159
issue-tracking
https://github.com/dlbeer/quirc/issues/162
third-party-advisory
https://hackmd.io/@haind-pwn/quirc-alignment-pattern-infinite-loop-dos
technical-description
https://github.com/dlbeer/quirc/blob/542848dd6b9b0eaa9587bbf25b9bc67bd8a71fca/lib/identify.c#L578-L636
third-party-advisory
https://www.vulncheck.com/advisories/quirc-through-1.2-denial-of-service-via-find-alignment-pattern-spiral-search