CVE-2026-5236 Axiomatic Bento4 DSI v1 Ap4Dac4Atom.cpp SkipBits heap-based overflow
A heap-based buffer overflow in the Bento4 library allows local attackers to execute arbitrary code or cause denial of service via a crafted file.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5236?
CVE-2026-5236 is a medium-severity memory corruption vulnerability in Axiomatic Bento4, published on 31 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was identified in Axiomatic Bento4 up to 1.6.0-641. Affected is the function AP4_BitReader::SkipBits of the file Ap4Dac4Atom.cpp of the component DSI v1 Parser. Such manipulation of the argument n_presentations leads to heap-based buffer overflow. The attack needs to be performed locally. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.
Which versions are affected by CVE-2026-5236?
How do I fix CVE-2026-5236?
No fix has been published for CVE-2026-5236 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-5236 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5236 exists.
Sources
Also known as GHSA-9jwv-5qpr-m876.