CVE-2026-125199
Received Received - Intake

Memory Leak in FFmpeg VC-1 Decoder

Publication date: 2026-11-09

Last updated on: 2026-11-09

Assigner: VulnCheck

Description
FFmpeg through 9.0.2 contains a memory leak vulnerability in vc1_decode_frame() in libavcodec/vc1dec.c that leaks slice buffers when init_get_bits8() fails. Attackers can supply crafted files with repeated oversized VC-1 slices exceeding the bit reader limit to exhaust memory of decoding applications.

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Meta Information

Published
2026-11-09
Last Modified
2026-11-09
Generated
2026-11-09
AI Q&A
2026-11-09
EPSS Evaluated
N/A
NVD
CVE-2026-125199
EUVD
EUVD-2026-120288

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
FFmpeg FFmpeg From 8.1 (inc) to 9.0.2 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-401 The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

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Executive Summary

This vulnerability is a memory leak in FFmpeg versions up to 9.0.2. It occurs in the vc1_decode_frame() function within libavcodec/vc1dec.c. When init_get_bits8() fails, slice buffers are not properly released, causing memory exhaustion. Attackers can exploit this by providing files with repeated oversized VC-1 slices that exceed the bit reader's capacity.

Impact Analysis

This vulnerability can cause denial-of-service conditions by consuming excessive memory on systems running vulnerable FFmpeg versions. Applications processing malicious media files may crash or become unresponsive due to memory exhaustion. Local attackers with file access could trigger this issue.

Mitigation Strategies

Update FFmpeg to the latest version (9.0.3 or later) to patch the memory leak in vc1_decode_frame(). Avoid processing untrusted VC-1 video files until patched.

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