Gpac
CVE-2026-27821
HIGH
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Stack buffer overflow in GPAC's NHML file parser (versions up to 26.02.0) allows local attackers to achieve code execution by crafting malicious XML files with oversized xmlHeaderEnd attributes that bypass length validation. The vulnerability stems from unsafe use of strcpy() in src/filters/dmx_nhml.c and affects systems processing untrusted NHML files. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Attacker must supply a crafted NHML multimedia file with xmlHeaderEnd XML attribute value exceeding 1000 bytes. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker could exploit this vulnerability to compromise the affected system. |
| Remediation | A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all systems running GPAC up to version 26.02.0 and assess exposure in production environments. …
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