Buffer overflow in Gpac
CVE-2026-33144
GPAC is an open-source multimedia framework. Prior to commit 86b0e36, a heap-based buffer overflow (write) vulnerability was discovered in GPAC MP4Box. The vulnerability exists in the gf_xml_parse_bit_sequence_bs function in utils/xml_bin_custom.c when processing a crafted NHML file containing malicious <BS> (BitSequence) elements. An attacker can exploit this by providing a specially crafted NHML file, causing an out-of-bounds write on the heap. This issue has been via commit 86b0e36.
Vulnerability class: Buffer Overflow
EPSS: 0.002 (6.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H.
Affected products
- Gpac — versions < 86b0e36ea4c71402fbdaf7e13d73ba8841003e72
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-33144?
- CVE-2026-33144 is a medium-severity vulnerability in Gpac, classified under Out-of-bounds Write. CVSS score: 5.8/10. Published 2026-03-20.
- How severe is CVE-2026-33144?
- Medium severity. CVSS v3 base score is 5.8 out of 10.