CVE-2026-110596 quirc through 1.2 Denial of Service via find_alignment_pattern Spiral Search
Attackers can cause a denial of service in the quirc library by supplying a crafted QR image that triggers excessive CPU usage during decoding.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-110596?
CVE-2026-110596 is a medium-severity denial of service vulnerability in dlbeer quirc, published on 14 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-834
Which versions are affected by CVE-2026-110596?
How do I fix CVE-2026-110596?
No fix has been published for CVE-2026-110596 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-110596 being exploited?
There is no known exploitation of CVE-2026-110596 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-110596, GHSA-fjm5-xm8f-3gjj, UBUNTU-CVE-2026-110596.