CVE-2026-33144
GPAC MP4Box Heap Buffer Overflow Write in gf_xml_parse_bit_sequence_bs (NHML BS Parsing)
CVSS Score
5.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | gpac |
| Product | gpac |
| Published | Mar 20, 2026 |
| Last Updated | Mar 20, 2026 |
Stay Ahead of the Next One
Get instant alerts for gpac gpac
Be the first to know when new medium vulnerabilities affecting gpac gpac are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High
Affected Versions
gpac / gpac
< 86b0e36ea4c71402fbdaf7e13d73ba8841003e72