PT-2026-22061 · Gpac+1 · Gpac+1

Wooseokdotkim · CVE-2026-27821 · Published 2026-02-23 · Updated 2026-06-24

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions GPAC versions up to and including 26.02.0

Description GPAC is an open-source multimedia framework. A stack buffer overflow occurs during NHML file parsing in src/filters/dmx nhml.c. The xmlHeaderEnd XML attribute’s value from att->value is copied into the szXmlHeaderEnd buffer (size 1000 bytes) using the strcpy() function without length validation. If the input exceeds 1000 bytes, it overwrites the stack buffer boundary.

Recommendations Update to a version later than 26.02.0.

Exploit

Fix

DoS

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

BDU:2026-09513

CVE-2026-27821

GHSA-Q7QH-8R2R-Q559

Affected Products

Gpac

Red Os

References · 18

• 🔥 https://github.com/gpac/gpac/security/advisories/GHSA-q7qh-8r2r-q559 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27821.json · Exploit
• https://github.com/gpac/gpac/commit/9bd7137fded2db40de61a2cf3045812c8741ec52 · Patch
• https://cve.org/CVERecord?id=CVE-2026-27821 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-27821 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27821 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-27821 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-27821 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-27821 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-09513 · Security Note
• https://osv.dev/vulnerability/CVE-2026-27821 · Vendor Advisory
• https://twitter.com/CVEnew/status/2027004247619813704 · Twitter Post
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti-red-os-8-0/uyazvimost-gpac-cve-2026-27821-8.0 · Note
• https://redos.red-soft.ru/support/secure · Note
• https://twitter.com/dailycve/status/2031945561797009640 · Twitter Post