Bug 2569550 (CVE-2026-125178)

Summary: CVE-2026-125178 ffmpeg: ffmpeg: Denial of Service via crafted TDSC cursor dimensions
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bbrownin
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FFmpeg. The TDSC video decoder fails to properly validate cursor dimensions before storing them. By convincing a user to open a specially crafted AVI file with oversized cursor dimensions, an attacker can trigger an out-of-bounds memory read. This can lead to a Denial of Service (DoS) through an application crash or cause information disclosure by leaking memory into decoded video frames.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-11-10 13:02:32 UTC 
FFmpeg through 9.0.2 contains an out-of-bounds heap read vulnerability in tdsc_load_cursor() in libavcodec/tdsc.c, which stores cursor dimensions before validating them. Attackers can supply a crafted AVI file with oversized TDSC cursor dimensions so tdsc_paint_cursor() reads past the cursor buffer, crashing the decoder or leaking heap memory into frames.