CVE-2016-9824 Libav CVE debrief

Who should care

Teams that run Libav 11.8 or ship software that embeds Libav for parsing or transcoding user-supplied media files should review this issue, especially if crashes would affect service availability.

Technical summary

The NVD record identifies an integer overflow in libswscale/x86/swscale.c in Libav 11.8 and maps it to CWE-190. The published CVSS vector is CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H, indicating an availability-impacting crash condition rather than a confidentiality or integrity issue. The supplied references include a SecurityFocus BID entry and a Gentoo advisory discussing crashes observed in the affected code path.

Defensive priority

Medium. The issue is limited to a specific Libav version and is described as causing crashes rather than code execution, but it still matters for systems that routinely process untrusted files or need high availability.

Recommended defensive actions

• Inventory systems and applications that depend on Libav 11.8 or bundle its swscale component.
• Update or replace the affected Libav package through your distribution or software vendor as soon as a fixed build is available.
• Treat media files from untrusted sources as high risk and isolate parsing/transcoding workloads where possible.
• Run file-processing services with least privilege and add process isolation or sandboxing to limit crash impact.
• Monitor for repeated crashes or abnormal exits in media handling workflows and validate stability after remediation.

Evidence notes

The CVE description states that an integer overflow in libswscale/x86/swscale.c in Libav 11.8 can let crafted files cause a denial-of-service crash. NVD lists the affected CPE as libav:libav:11.8, classifies the weakness as CWE-190, and assigns CVSS 5.5/Medium. The reference set also points to a SecurityFocus BID and a Gentoo advisory documenting crashes in the affected area.

Official resources