Heap Buffer Overflow in GPAC MP4Box Affects Media Processing
CVE-2025-55640

5.5MEDIUM

Key Information:

Vendor

GPAC

Status
MP4Box
Vendor
CVE Published:
16 October 2026

What is CVE-2025-55640?

A heap buffer overflow vulnerability exists in the stbl_AddSize function of GPAC MP4Box version 2.4. This flaw occurs when the application processes specially crafted MP4 files, allowing an attacker to exploit this weakness and cause a Denial of Service. By manipulating certain parameters, an attacker can disrupt the normal operation of the application, making it critical for users to apply necessary security measures.

References

https://github.com/gpac/gpac/issues/3261
https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Bo...
https://github.com/gpac/gpac/commit/321624f28d19a413449fd...

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.