Out-of-bounds read via DHAV duration offset underflow
Published Oct 6, 2025 · Updated Oct 6, 2025
Out-of-bounds access in affected FFmpeg 8.0 development snapshots allows context-dependent attackers to read memory via crafted DHAV files. In libavformat/dhav.c get_duration, a 32-bit header offset can place end_pos before end_buffer_pos, and their subtraction underflows before the duration read. Processing a DHAV file larger than 0x100000 bytes with a crafted offset is required; the resulting access reads before the allocated buffer and can expose process memory.
Summary
What happened
Out-of-bounds access in affected FFmpeg 8.0 development snapshots allows context-dependent attackers to read memory via crafted DHAV files. In libavformat/dhav.c get_duration, a 32-bit header offset can place end_pos before end_buffer_pos, and their subtraction underflows before the duration read. Processing a DHAV file larger than 0x100000 bytes with a crafted offset is required; the resulting access reads before the allocated buffer and can expose process memory.
The record
- CVE
- CVE-2025-59729
- Published
- Oct 6, 2025
- Updated
- Oct 6, 2025
- Vendor
- FFmpeg
- Product
- FFmpeg
- Classifications
- CWE-787, T1204.002
- Attack vector
- adjacent
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 6, 2025CVE publishedPublication date reported by the CVE source.
- 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?
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- Affected versionversion=a218cafe4d3be005ab0c61130f90db4d21afb5db <8.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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