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.
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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
- Base score
- 6.1
- Version
- 3.1
- Vector
- CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days
- 0.15 %
- Percentile among all scored CVEs
- 4
- Score date
- 10/20/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
ATT&CK techniques
How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.
- Exploitation
T1203Exploitation for Client Executionexecution85 % - Primary impact
T1499.004Application or System Exploitationimpact60 %
El vector UI:R exige interacción del usuario (procesar media con etiquetas manipuladas) → T1203; el texto solo menciona DoS potencial o corrupción de memoria limitada, sin ejecución de comandos, por lo que se descarta T1059.
Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.
ATT&CK mitigations that cover these techniques
Affected technologies (1)
⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.
CWEs
- CWE-787
References
Raw JSON (NVD)
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{
"id": "CVE-2026-100231",
"cveTags": [],
"metrics": {
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"timestamp": "2026-10-14T16:11:31.970123Z"
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"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
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"packageName": "gstreamer1-plugins-bad-free",
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"published": "2026-10-14T10:17:50.483",
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{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541468",
"source": "secalert@redhat.com"
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"description": [
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"descriptions": [
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"value": "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."
}
],
"lastModified": "2026-10-15T16:33:26.290",
"sourceIdentifier": "secalert@redhat.com"
}