CVE-2026-20911 LibRaw CVE debrief

Who should care

Developers and users of LibRaw, especially those using versions Commit 0b56545 and Commit d20315b, should be aware of this vulnerability and take steps to mitigate it. This vulnerability can be exploited by providing a malicious file, which can lead to a heap buffer overflow. Therefore, anyone who uses or develops software with LibRaw should prioritize patching this vulnerability.

Technical summary

The CVE-2026-20911 vulnerability is a heap-based buffer overflow in the HuffTable::initval functionality of LibRaw. This vulnerability can be triggered by providing a specially crafted malicious file. The vulnerability has a CVSS score of 9.8, indicating a high severity level. The affected versions of LibRaw are Commit 0b56545 and Commit d20315b. The Common Weakness Enumeration (CWE) for this vulnerability is CWE-131 and CWE-120.

Defensive priority

This vulnerability has a high defensive priority due to its critical severity and potential for arbitrary code execution. Immediate patching or mitigation is recommended.

Recommended defensive actions

• Patch LibRaw to the latest version
• Restrict access to untrusted files
• Implement memory safety mechanisms
• Monitor for suspicious file uploads or processing
• Perform regular vulnerability scans and updates

Evidence notes

The CVE-2026-20911 vulnerability was published on April 7, 2026, and modified on June 30, 2026. The vulnerability affects LibRaw versions Commit 0b56545 and Commit d20315b. The CVSS score is 9.8, indicating a critical severity level. The CWE for this vulnerability is CWE-131 and CWE-120.

Official resources