GPAC MP4Box utils/xml_bin_custom.c gf_xml_parse_bit_sequence_bs out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.17

Summaryinfo

A vulnerability has been found in GPAC and classified as critical. The impacted element is the function gf_xml_parse_bit_sequence_bs of the file utils/xml_bin_custom.c of the component MP4Box. This manipulation causes out-of-bounds write. This vulnerability is tracked as CVE-2026-33144. The attack is possible to be carried out remotely. No exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability classified as critical was found in GPAC (the affected version unknown). Affected by this vulnerability is the function gf_xml_parse_bit_sequence_bs of the file utils/xml_bin_custom.c of the component MP4Box. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-33144 since 03/17/2026. The exploitation appears to be difficult. The attack can be launched remotely. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 303265 (Linux Distros Unpatched Vulnerability : CVE-2026-33144), which helps to determine the existence of the flaw in a target environment.

Applying the patch 86b0e36ea4c71402fbdaf7e13d73ba8841003e72 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the databases at Tenable (303265) and EUVD (EUVD-2026-13782). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.8
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 303265
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-33144

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 86b0e36ea4c71402fbdaf7e13d73ba8841003e72

Timelineinfo

03/17/2026 CVE reserved
03/20/2026 +3 days Advisory disclosed
03/20/2026 +0 days VulDB entry created
03/27/2026 +7 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-3jw5-9pmw-vmfg
Status: Confirmed

CVE: CVE-2026-33144 (🔒)
GCVE (CVE): GCVE-0-2026-33144
GCVE (VulDB): GCVE-100-352117
EUVD: 🔒

Entryinfo

Created: 03/20/2026 23:24
Updated: 03/27/2026 01:04
Changes: 03/20/2026 23:24 (67), 03/21/2026 03:55 (1), 03/22/2026 11:18 (2), 03/27/2026 01:04 (2)
Complete: 🔍
Cache ID: 216:3D0:103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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