CVE-2026-100231

A flaw was found in the GStreamer multimedia framework's ASF muxer plugin (asfmux). When writing string metadata tags containing Unicode characters outside the Basic Multilingual Plane (such as emoji) to an ASF container, the plugin incorrectly calculates the buffer size needed for the UTF-16LE representation. The size calculation assumes each Unicode code point requires 2 bytes, but non-BMP characters require 4 bytes (surrogate pairs). This leads to a heap out-of-bounds write when the actual UTF-16LE conversion is written into the undersized buffer. An attacker could exploit this by providing media with crafted metadata tags to an application that transcodes or remuxes to ASF format while preserving metadata, potentially causing a denial of service or limited memory corruption.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 4.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/security/cve/CVE-2026-100231
https://bugzilla.redhat.com/show_bug.cgi?id=2541468

Configurations

No configuration.

History

14 Oct 2026, 10:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-14 10:17

Updated : 2026-10-15 16:33

NVD link : CVE-2026-100231

Mitre link : CVE-2026-100231

CVE.ORG link : CVE-2026-100231

JSON object : View

Products Affected

No product.

CWE

CWE-787

Out-of-bounds Write

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