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Vulnerability record · CVE-2026-33144 · published 20 March 2026

CVE-2026-33144: Gpac out-of-bounds write vulnerability

Gpac · Gpac

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.

7.8 CVSS 3.1 High EPSS 0.17% · top 93.9% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/gpac/gpac/commit/86b0e36ea4c71402fbdaf7e13d73ba8841003e72 Patch
https://github.com/gpac/gpac/security/advisories/GHSA-3jw5-9pmw-vmfg ExploitVendor Advisory
https://github.com/gpac/gpac/security/advisories/GHSA-3jw5-9pmw-vmfg ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-46427Gpac null pointer dereference vulnerabilityAn issue was discovered in gpac version 2.3-DEV-rev588-g7edc40fee-master, allows remote attackers to execute arbitrary code, cause a denial of servic…EPSS 1.1%9.8CVE-2024-0321Gpac stack-based buffer overflow vulnerabilityStack-based Buffer Overflow in GitHub repository gpac/gpac prior to 2.3-DEV.EPSS 1.0%9.8CVE-2023-46932Gpac out-of-bounds write vulnerabilityHeap Buffer Overflow vulnerability in GPAC version 2.3-DEV-rev617-g671976fcc-master, allows attackers to execute arbitrary code and cause a denial of…EPSS 1.1%9.8CVE-2023-2840Gpac null pointer dereference vulnerabilityNULL Pointer Dereference in GitHub repository gpac/gpac prior to 2.2.2.EPSS 0.65%9.8CVE-2022-36190Gpac use after free vulnerabilityGPAC mp4box 2.1-DEV-revUNKNOWN-master has a use-after-free vulnerability in function gf_isom_dovi_config_get. This vulnerability was fixed in commit …EPSS 1.1%9.8CVE-2022-1795Gpac use after free vulnerabilityUse After Free in GitHub repository gpac/gpac prior to v2.1.0-DEV.EPSS 1.0%9.8CVE-2021-28300Gpac null pointer dereference vulnerabilityNULL Pointer Dereference in the "isomedia/track.c" module's "MergeTrack()" function of GPAC v0.5.2 allows attackers to execute arbitrary code or caus…EPSS 2.1%9.8CVE-2020-11558Gpac use after free vulnerabilityAn issue was discovered in libgpac.a in GPAC 0.8.0, as demonstrated by MP4Box. audio_sample_entry_Read in isomedia/box_code_base.c does not properly …EPSS 1.5%

Source: NIST National Vulnerability Database (record CVE-2026-33144), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.