CVE-2025-25467
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedInsufficient tracking and releasing of allocated used memory in libx264 git master allows attackers to execute arbitrary code via creating a crafted AAC file.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA memory management vulnerability in libx264 master branch involves insufficient tracking and releasing of allocated memory, allowing attackers to achieve arbitrary code execution by supplying a crafted AAC file to the encoder library.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Locate libx264 library on the systemSearch for libx264 files: 'find / -name "libx264*" 2>/dev/null' on Linux, or check common library paths like /usr/lib/, /usr/local/lib/, or within application directories on WindowsAffected if libx264 library file is found on the system
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Identify the installed libx264 versionRun 'pkg-config --modversion x264' or 'x264 --version' if the CLI tool is available; alternatively, inspect the library file name which may contain the version (e.g., libx264.so.164)Affected if The version number cannot be determined or is older than the patched version (when known)
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Determine if applications use libx264 for AAC audio processingReview application documentation or configuration to confirm whether libx264 is used for muxing/demuxing AAC audio files; check process memory or runtime dependencies with 'ldd <application>' or 'lsof' during AAC processingAffected if libx264 is linked to applications that handle AAC audio files
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Verify if processing of untrusted AAC files is permittedReview application or system settings for AAC file handling; check if there are input validation controls or if applications accept AAC files from network sources or user uploadsAffected if Applications accept and process AAC files from untrusted or external sources without validation
The system is affected if libx264 is installed, handles AAC files, and processes content from untrusted sources, especially when the libx264 version is older than the patched release.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUsers should avoid processing untrusted AAC files with development versions of libx264 and monitor for stable releases that address this memory management flaw; consider input validation and sandboxing as defense-in-depth until patched.
- Consultation2.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-25467 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-25467 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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