GPAC MP4Box Heap Buffer Overflow Write in gf_xml_parse_bit_sequence_bs (NHML BS Parsing)

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Summary

CVECVE-2026-33144
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-20 21:17:15 UTC
Updated2026-04-14 18:21:42 UTC
DescriptionGPAC 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.000160000 probability, percentile 0.034940000 (date 2026-04-15)

Problem Types: CWE-787 | CWE-787 CWE-787: Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1[email protected]Secondary5.8MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H
3.1CNADECLARED5.8MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Gpac Gpac All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gpac Gpac affected < 86b0e36ea4c71402fbdaf7e13d73ba8841003e72 Not specified

References

ReferenceSourceLinkTags
github.com/gpac/gpac/security/advisories/GHSA-3jw5-9pmw-vmfg 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Vendor Advisory
github.com/gpac/gpac/commit/86b0e36ea4c71402fbdaf7e13d73ba8841003e72 [email protected] github.com Patch
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