CVE WatchOct 15, 2026

CVE-2026-100231

A flaw was found in the GStreamer multimedia framework's ASF muxer plugin (asfmux). When writing string metadata tags containing Unicode cha

CVSS

6.1

Medium

EPSS

0.2%

KEV

—

Exploit Today

0-100

Published: Oct 14, 2026 · Last modified: Oct 15, 2026 · CWE-787

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-10-142026-10-20

Technical description

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.

Official references

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