CVE-2026-125247
Received Received - Intake

Integer Overflow in FFmpeg Leads to Memory Leak

Publication date: 2026-11-09

Last updated on: 2026-11-09

Assigner: VulnCheck

Description
FFmpeg through 9.0.2 contains an integer overflow vulnerability in dng_decode_tiles() that allows attackers to leak uninitialized memory via crafted DNG tile dimensions. Attackers can set TileWidth or TileLength near INT_MAX so the tile loop never runs, outputting a frame exposing uninitialized or stale heap memory.

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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-2026-125247
EUVD
EUVD-2026-120197

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
FFmpeg FFmpeg From 0 (inc) to 9.0.2 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-190 The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

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Executive Summary

CVE-2026-125247 is an integer overflow vulnerability in FFmpeg through version 9.0.2. It occurs in the dng_decode_tiles() function within libavcodec/tiff.c. Attackers can exploit this by setting TileWidth or TileLength near INT_MAX, causing the tile loop to never run. This results in a frame being output with uninitialized or stale heap memory, potentially leaking sensitive data.

Detection Guidance

To detect this vulnerability, monitor for crashes or memory leaks when processing TIFF or DNG files with FFmpeg. Use tools like AddressSanitizer or Valgrind to detect memory corruption during file processing. Check FFmpeg version against 9.0.2 to identify affected systems.

Impact Analysis

This vulnerability could allow attackers to leak uninitialized memory, which may contain sensitive information such as passwords, encryption keys, or other confidential data. If exploited, it could lead to further attacks like arbitrary code execution or denial of service by corrupting memory.

Mitigation Strategies

Update FFmpeg to the latest patched version immediately. Avoid processing untrusted TIFF or DNG files until updated. Implement input validation for file dimensions to prevent crafted files from triggering the overflow.

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