# CVE-2026-36908: axiomatic-systems Bento4 stack overflow in AP4_TrunAtom

Source: https://junglewise.ai/threats/cve-2026-36908-axiomatic-systems-bento4-stack-overflow-in-ap4-trunatom  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-26. Updated: 2026-06-26  
License: CC BY 4.0 with a link back

CVE-2026-36908 · Severity: info · CVSS 5.5 · Published 2026-06-26

Bento4 is a popular library and toolset used for processing MP4 and other digital media files. A vulnerability in how it handles specific media data structures allows an attacker to crash applications using the library by providing a specially crafted MP4 file. This can lead to a denial-of-service, impacting the availability of media processing services or applications like media players.

Technologies: [Axiomatic Systems Bento4](https://junglewise.ai/threats/technologies/bento4). Vendors: [Axiomatic Systems](https://junglewise.ai/threats/vendors/axiomatic-systems).

## Quick answers

**Is CVE-2026-36908 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-36908 being exploited in the wild.

**How severe is CVE-2026-36908?** Informational severity, with a CVSS score of 5.5, published 26 June 2026.

**Which products and versions are affected?** Axiomatic Systems Bento4 before v1.8.9.

**Is there a fix for CVE-2026-36908?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-36908 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-36908?** Check whether you run Axiomatic Systems Bento4 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A vulnerability exists in the AP4_Array<AP4_TrunAtom::Entry>::EnsureCapacity component of Bento4. The issue is triggered when the library attempts to process a Track Run Atom (trun) within a crafted MP4 file, leading to an uncontrolled memory allocation or stack exhaustion during capacity adjustment. An attacker can exploit this by providing a malicious MP4 file to an application linked with Bento4, such as mp42aac or media players like MPC-BE. This results in an out-of-memory (OOM) condition or a crash, causing a denial of service. The vulnerability is addressed in version 1.8.9.

## Affected products

- axiomatic-systems Bento4 before v1.8.9

## Timeline

- 2023-03-14: disclosed: Initial issue reported on GitHub
- 2026-06-26: advisory: CVE published to NVD

## References

- [https://github.com/Aleksoid1978/MPC-BE/issues/1005](https://github.com/Aleksoid1978/MPC-BE/issues/1005)
- [https://github.com/axiomatic-systems/Bento4/issues/842](https://github.com/axiomatic-systems/Bento4/issues/842)

## Related threats

- [Bento4 integer underflow in MP4 atom parsing](https://junglewise.ai/threats/cve-2026-88377-bento4-1-6-0-0-contains-an-integer-underflow-vulnerability-in-the)
- [Bento4 integer underflow in avcC/hvcC atom parsing](https://junglewise.ai/threats/cve-2026-88376-bento4-1-6-0-0-contains-an-integer-underflow-vulnerability-in-ap4)
- [Axiomatic-systems Bento4 stack overflow in AP4_StsdAtom](https://junglewise.ai/threats/cve-2026-36907-axiomatic-systems-bento4-stack-overflow-in-ap4-stsdatom)