Medium 5.8Published Mar 20, 2026

CVE-2026-33144GPAC MP4Box Heap Buffer Overflow Write in gf_xml_parse_bit_sequence_bs (NHML BS Parsing)

Updated under an hour ago (Oct 27, 2026, 4:20 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 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.

CVSS: 5.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

gpac gpac gpac:gpac (from the name)	before 86b0e36ea4c71402fbdaf7e13d73ba8841003e72	CNA record
gpac gpac gpac:gpac	before 2026-03-17	NVD

References

References

https://github.com/gpac/gpac/security/advisories/GHSA-3jw5-9pmw-vmfg	x-refsource-confirm, exploit, vendor-advisory
https://github.com/gpac/gpac/commit/86b0e36ea4c71402fbdaf7e13d73ba8841003e72	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.