CVE-2026-33144: Gpac

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Gpac Gpac: before 2026-03-17 (fixed in 2026-03-17)

Published 2026-03-20. Last modified 2026-06-17.