CVE-2025-59731

Heap-buffer overflow via unchecked EXR RLE length

Published Oct 6, 2025 · Updated Oct 6, 2025

Out-of-bounds access in FFmpeg before 8.0 allows context-dependent attackers to corrupt memory via a crafted DWAA- or DWAB-compressed OpenEXR file. In dwa_uncompress, file-controlled rle_raw_size allocates td->rle_raw_data, but pixel loops index it by image dimensions and half the declared length without verifying that the allocation covers those offsets. The malformed file must be processed by an application using the EXR decoder; the published record does not specify a crash or code-execution outcome.

CVSS severity6.9
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in FFmpeg before 8.0 allows context-dependent attackers to corrupt memory via a crafted DWAA- or DWAB-compressed OpenEXR file. In dwa_uncompress, file-controlled rle_raw_size allocates td->rle_raw_data, but pixel loops index it by image dimensions and half the declared length without verifying that the allocation covers those offsets. The malformed file must be processed by an application using the EXR decoder; the published record does not specify a crash or code-execution outcome.

The record

CVE
CVE-2025-59731
Published
Oct 6, 2025
Updated
Oct 6, 2025
Vendor
FFmpeg
Product
FFmpeg
Classifications
CWE-787, T1204.002
Attack vector
adjacent
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.1.1 <8.0
  2. Affected versionversion=9a32b863074ed4140141e0d3613905c6f1fe61c5 <8.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesUnavailable in this record.

What is affected?

FFmpeg · FFmpegversion=7.1.1 <8.0; version=9a32b863074ed4140141e0d3613905c6f1fe61c5 <8.0

Published CVSS scores

6.9Google Inc.CVSS:4.0/AV:A/AC:H/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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