Local crash via unchecked DSI presentation count
Published Mar 31, 2026 · Updated Mar 31, 2026
Heap-based buffer overflow in Bento4 1.6.0-641 allows local users to crash MP4-processing applications with a crafted MP4 file. In the DSI v1 path, AP4_Dac4Atom trusts the 9-bit n_presentations count and repeatedly calls AP4_BitReader::SkipBits beyond a short dac4 payload without checking remaining bits. Exploitation requires local low-privileged access to submit and parse the file; the demonstrated result is an out-of-bounds read and process crash.
Summary
What happened
Heap-based buffer overflow in Bento4 1.6.0-641 allows local users to crash MP4-processing applications with a crafted MP4 file. In the DSI v1 path, AP4_Dac4Atom trusts the 9-bit n_presentations count and repeatedly calls AP4_BitReader::SkipBits beyond a short dac4 payload without checking remaining bits. Exploitation requires local low-privileged access to submit and parse the file; the demonstrated result is an out-of-bounds read and process crash.
The record
- CVE
- CVE-2026-5236
- Published
- Mar 31, 2026
- Updated
- Mar 31, 2026
- Vendor
- Axiomatic Systems LLC
- Product
- Bento4
- Classifications
- CWE-122, CWE-119
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 31, 2026CVE publishedPublication date reported by the CVE source.
- Mar 31, 2026Record 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.
- Affected versionversion=1.6.0-641
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- poc3_dac4_heap_oob.mp4 proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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