CVE-2026-125100
Received Received - Intake

Integer Overflow in FFmpeg OpenEXR Decoder

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 the OpenEXR decoder's decode_frame() in libavcodec/exr.c that miscalculates the tiled block count. Attackers can supply a crafted tiled OpenEXR image with large dimensions and small tiles to skip decoding and disclose uninitialized memory or stale frame data.

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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-2026-125100
EUVD
EUVD-2026-120254

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

This vulnerability is an integer overflow in FFmpeg's OpenEXR decoder. It occurs when the decoder miscalculates the number of tiled blocks in an image due to large dimensions and small tiles. Attackers can exploit this to skip decoding and access uninitialized or stale memory data.

Impact Analysis

This vulnerability could allow attackers to read sensitive memory contents, potentially exposing confidential data. It may also lead to crashes or unexpected behavior in applications using FFmpeg to process OpenEXR images.

Mitigation Strategies

Update FFmpeg to version 9.0.3 or later to address the integer overflow in the OpenEXR decoder. Avoid processing untrusted OpenEXR files with large dimensions and small tiles until patched.

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