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

Quick assessment

Affected
gpac gpac
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GPAC MP4Box是多媒体打包器。它主要用于处理 ISOBMF 文件（例如 MP4、3GP），但也可用于从AVI, MPG, MKV, MPEG-2 TS等容器文件中导入/导出媒体。 GPAC MP4Box 86b0e36之前版本存在安全漏洞，该漏洞源于处理特制NHML文件时gf_xml_parse_bit_sequence_bs函数存在堆缓冲区溢出，可能导致越界写入。

CVSS 5.8 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-33144

Vulnerability Information
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Vulnerability Title
GPAC MP4Box Heap Buffer Overflow Write in gf_xml_parse_bit_sequence_bs (NHML BS Parsing)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
GPAC MP4Box 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GPAC MP4Box是多媒体打包器。它主要用于处理 ISOBMF 文件（例如 MP4、3GP），但也可用于从AVI, MPG, MKV, MPEG-2 TS等容器文件中导入/导出媒体。 GPAC MP4Box 86b0e36之前版本存在安全漏洞，该漏洞源于处理特制NHML文件时gf_xml_parse_bit_sequence_bs函数存在堆缓冲区溢出，可能导致越界写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gpac gpac < 86b0e36ea4c71402fbdaf7e13d73ba8841003e72 -

II. Public POCs for CVE-2026-33144

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III. Intelligence Information for CVE-2026-33144

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Patches & Fixes for CVE-2026-33144 (1)

Vendor Advisories for CVE-2026-33144 (1)

IV. Related Vulnerabilities

Same product: gpac
Same vendor: gpac
Same weakness: CWE-787

V. Comments for CVE-2026-33144

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