Heap-Based Buffer Overflow in Axiomatic Bento4 MP4 File Parser
CVE-2026-5235

4.8MEDIUM

Key Information:

Vendor

Axiomatic

Status
Bento4
Vendor
CVE Published:
31 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5235?

A significant vulnerability exists in Axiomatic Bento4 up to version 1.6.0-641, specifically within the AP4_BitReader::ReadCache function found in Ap4Dac4Atom.cpp. This issue can lead to a heap-based buffer overflow when exploited locally. Notably, the problem has been publicly disclosed, raising concerns for potential exploitation. Although the project was notified early through an issue report, there has yet to be a response or remediation from the developers.

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Affected Version(s)

Bento4 1.6.0-641

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-5235 - Proof of Concept

References

https://vuldb.com/vuln/354386
vdb-entrytechnical-description
https://vuldb.com/vuln/354386/cti
signaturepermissions-required
https://vuldb.com/submit/780472
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

breakingbad (VulDB User)
JSON
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