CVE-2026-110596 dlbeer CVE debrief

Who should care

Defenders responsible for QR image decoding applications, particularly those using the quirc library, should assess exposure and prioritize verification and remediation efforts. This includes reviewing and updating quirc to a non-affected version, implementing compensating controls, and monitoring for suspicious activity. Additionally, defenders should review QR image decoding applications to handle crafted images and consider asset inventory and rollback/

Why it matters

CVE-2026-110596 is a Denial of Service vulnerability in quirc through 1.2, allowing attackers to hang quirc_end() with a crafted image, potentially leading to CPU exhaustion. Defenders should prioritize verifying and updating quirc, implementing compensating controls, and monitoring for suspicious activity.

• Potential CPU exhaustion in applications decoding QR images
• Denial of Service (DoS) vulnerability in quirc library
• Need for verification and updating quirc to a non-affected version

Technical summary

The quirc library through version 1.2 contains an excessive-iteration vulnerability in the find_alignment_pattern() function in lib/identify.c. This vulnerability allows attackers to craft an image that causes the quirc_end() function to hang, potentially leading to CPU exhaustion in applications that decode QR images. The vulnerability is triggered by a specific arrangement of finder patterns that produce a near-degenerate perspective transform. This can cause billions of iterations of the region_code() function, leading to a denial of service. Defenders should prioritize verifying and updating quirc to a non-affected version, if available, and implement compensating controls such as input validation and

Defensive priority

Defenders should prioritize verifying and updating quirc to a non-affected version, if available, and implement compensating controls such as input validation and monitoring for suspicious QR image decoding activity.

Recommended defensive actions

• Verify and update quirc to a non-affected version, if available
• Implement compensating controls such as input validation and monitoring for suspicious QR image decoding activity
• Review and update QR image decoding applications to handle crafted images
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, CVSS score, and affected versions. However, the corpus does not establish versions beyond 1.2, exploitation, impact, or remediation, which require verification from the supplied official sources.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.