CVE-2026-27821— GPAC NHML Demuxer (dmx_nhml.c) Vulnerable to Stack Buffer Overflow
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
栈缓冲区溢出
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-27821
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- fix buffer overflow in nhml dmx · gpac/gpac@9bd7137 · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-27821
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