CVE-2025-55639 Null dereference in n/a
Attackers can cause a Denial of Service in GPAC MP4Box by providing a crafted MP4 file that triggers a NULL pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-55639?
CVE-2025-55639 is a medium-severity vulnerability in Gpac Gpac, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
GPAC MP4Box v2.4 was discovered to contain a NULL pointer dereference in the gf_isom_add_track_kind() function at isomedia/isom_write.c. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted MP4 file.
Weakness: CWE-476
Which versions are affected by CVE-2025-55639?
It affects 1 product.
Products include Gpac Gpac.
How do I fix CVE-2025-55639?
No fix has been published for CVE-2025-55639 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-55639 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-55639 exists.
Other vulnerabilities in Gpac Gpac
Sources
Also known as DEBIAN-CVE-2025-55639, GHSA-hr6c-43h9-9ghm, UBUNTU-CVE-2025-55639.