Quick answers
- Is CVE-2026-88377 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-88377 being exploited in the wild.
- How severe is CVE-2026-88377?
- Informational severity, published 24 September 2026.
- Which products and versions are affected?
- Axiomatic Systems Bento4 1.6.0.0.
- Is there a fix for CVE-2026-88377?
- 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-2026-88377 attacked?
- It is attacked with local access or over the network, in a software library.
- Am I affected by CVE-2026-88377?
- 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
The vulnerability is an integer underflow (CWE-787) in AP4_AvccAtom::Create() and AP4_HvccAtom::Create() functions. When an MP4 atom header declares a size smaller than the 8-byte header itself (AP4_ATOM_HEADER_SIZE), the payload_size calculation wraps to a huge unsigned value, allowing a buffer overread and invalid pointer dereference in the AP4_DataBuffer copy operation. Attack vector is local/network (file parsing); no authentication or user interaction required beyond opening the malformed MP4.
Affected products
- Axiomatic Systems Bento4 1.6.0.0
Timeline
- 2026-09-24: disclosed