CVE-2025-59733

Memory corruption via mixed-type OpenEXR channel miscalculation

Published Oct 6, 2025 · Updated Oct 6, 2025

Out-of-bounds write in FFmpeg before 8.0 allows context-dependent attackers to corrupt memory via a crafted DWAA- or DWAB-compressed OpenEXR file. The dwa_uncompress function advances an output pointer using the main color channels' four-byte type while duplicate or unknown half-size channels received only two-byte buffer allocations. A user or application must decode the crafted file, after which the write exceeds td->uncompressed_data and corrupts decoder-process memory.

CVSS severity8.7
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds write in FFmpeg before 8.0 allows context-dependent attackers to corrupt memory via a crafted DWAA- or DWAB-compressed OpenEXR file. The dwa_uncompress function advances an output pointer using the main color channels' four-byte type while duplicate or unknown half-size channels received only two-byte buffer allocations. A user or application must decode the crafted file, after which the write exceeds td->uncompressed_data and corrupts decoder-process memory.

The record

CVE
CVE-2025-59733
Published
Oct 6, 2025
Updated
Oct 6, 2025
Vendor
FFmpeg
Product
FFmpeg
Classifications
CWE-787, T1203
Attack vector
adjacent
Privileges
unauthenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 privilegesunauthenticated

What is affected?

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

Published CVSS scores

8.7Google Inc.CVSS:4.0/AV:A/AC:H/AT:N/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo