CVE-2025-55640 Memory corruption in n/a
A heap buffer overflow in GPAC MP4Box allows attackers to cause a Denial of Service by providing a crafted MP4 file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-55640?
CVE-2025-55640 is a medium-severity memory corruption vulnerability in n/a, published on 16 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A heap buffer overflow in the stbl_AddSize function (isomedia/stbl_write.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.
Weakness: CWE-122
Which versions are affected by CVE-2025-55640?
How do I fix CVE-2025-55640?
No fix has been published for CVE-2025-55640 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-2025-55640 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-55640 exists.
Sources
Also known as GHSA-9g23-86wf-5x87, UBUNTU-CVE-2025-55640.