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CVE-2026-27821— GPAC NHML Demuxer (dmx_nhml.c) Vulnerable to Stack Buffer Overflow

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是GPAC开源的一款开源的多媒体框架。 GPAC 26.02.0及之前版本存在安全漏洞，该漏洞源于NHML文件解析时存在栈缓冲区溢出，可能导致执行任意代码。

AI Predicted 8.8 Difficulty: Easy EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-27821

Vulnerability Information
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Vulnerability Title
GPAC NHML Demuxer (dmx_nhml.c) Vulnerable to Stack Buffer Overflow
Source: CVE Program / CVE List V5
Vulnerability Description
GPAC is an open-source multimedia framework. In versions up to and including 26.02.0, a stack buffer overflow occurs during NHML file parsing in `src/filters/dmx_nhml.c`. The value of the xmlHeaderEnd XML attribute is copied from att->value into szXmlHeaderEnd[1000] using strcpy() without any length validation. If the input exceeds 1000 bytes, it overwrites beyond the stack buffer boundary. Commit 9bd7137fded2db40de61a2cf3045812c8741ec52 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
GPAC 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GPAC是GPAC开源的一款开源的多媒体框架。 GPAC 26.02.0及之前版本存在安全漏洞，该漏洞源于NHML文件解析时存在栈缓冲区溢出，可能导致执行任意代码。
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 <= 26.02.0 -

II. Public POCs for CVE-2026-27821

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III. Intelligence Information for CVE-2026-27821

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Patches & Fixes for CVE-2026-27821 (1)

Vendor Advisories for CVE-2026-27821 (1)

IV. Related Vulnerabilities

Same product: gpac
Same vendor: gpac
Same weakness: CWE-121

V. Comments for CVE-2026-27821

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