GPAC up to 26.02.0 NHML File Parser src/filters/dmx_nhml.c strcpy xmlHeaderEnd stack-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in GPAC up to 26.02.0. This affects the function strcpy of the file src/filters/dmx_nhml.c of the component NHML File Parser. Executing a manipulation of the argument xmlHeaderEnd can lead to stack-based overflow. This vulnerability is handled as CVE-2026-27821. The attack can be executed remotely. There is not any exploit available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability was found in GPAC up to 26.02.0. It has been declared as critical. This vulnerability affects the function strcpy of the file src/filters/dmx_nhml.c of the component NHML File Parser. The manipulation of the argument xmlHeaderEnd with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-27821 since 02/24/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 300487 (Linux Distros Unpatched Vulnerability : CVE-2026-27821), which helps to determine the existence of the flaw in a target environment.

Applying the patch 9bd7137fded2db40de61a2cf3045812c8741ec52 is able to eliminate this problem.

The vulnerability is also documented in the databases at Tenable (300487) and EUVD (EUVD-2026-8784). Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Proof-of-Concept

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 300487
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-27821

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 9bd7137fded2db40de61a2cf3045812c8741ec52

Timelineinfo

02/24/2026 CVE reserved
02/26/2026 +2 days Advisory disclosed
02/26/2026 +0 days VulDB entry created
03/12/2026 +14 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-27821 (🔒)
GCVE (CVE): GCVE-0-2026-27821
GCVE (VulDB): GCVE-100-347866
EUVD: 🔒

Entryinfo

Created: 02/26/2026 01:19
Updated: 03/12/2026 01:40
Changes: 02/26/2026 01:19 (71), 02/26/2026 04:59 (1), 03/01/2026 13:48 (2), 03/05/2026 15:51 (2), 03/12/2026 01:40 (12)
Complete: 🔍
Cache ID: 216:F81:103

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