CVE-2026-110596: Excessive Iteration in dlbeer quirc
Description
quirc versions up to 1.2 contain a vulnerability in the find_alignment_pattern() function that allows crafted QR images to cause excessive CPU usage. This occurs when three finder patterns produce a near-degenerate perspective transform, leading to billions of iterations in region_code() and hanging the quirc_end() function. The vulnerability has a medium severity with a CVSS score of 6.8.
CVSS v4.0
Score 6.8medium
Affected software
dlbeer
quirc
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
quirc through version 1.2 has an excessive-iteration vulnerability in the find_alignment_pattern() function located in lib/identify.c. An attacker can craft QR images with three finder patterns arranged to produce a near-degenerate perspective transform. This causes the region_code() function to perform billions of iterations, exhausting CPU resources and causing the quirc_end() function to hang. The vulnerability allows denial of service via CPU exhaustion during QR code decoding.
Potential Impact
The vulnerability allows an attacker to cause a denial of service by hanging the quirc_end() function through CPU exhaustion. This impacts applications using quirc to decode attacker-supplied QR images, potentially leading to application unavailability or degraded performance.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid processing untrusted QR images with vulnerable versions of quirc.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-14T13:07:18.898Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6acf92e92cdf04f6568a2e17
Added to database: 10/14/2026, 14:34:17 UTC
Last enriched: 10/14/2026, 15:18:53 UTC
Last updated: 10/14/2026, 19:00:33 UTC
Views: 1
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