Gstreamer CVE-2026-3086

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EUVD

EUVD-2026-12131 HIGH

Out-of-bounds Write (CWE-787)

2026-03-13 zdi

RCE Buffer Overflow Memory Corruption Gstreamer

7.8

CVSS 3.1 · Vendor: zdi

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Craft malicious H.266 video file with malformed APS unit
Delivery

Deliver file to user or application
Exploit

Application parses file with vulnerable GStreamer
Execution

Buffer overflow writes past allocation
Impact

Execute arbitrary code with user privileges

Vulnerability Assessment

Weakness	CWE CWE-787 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, write limits MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	GStreamer library must be linked and actively parsing H.266/VVC video content; H.266 codec parser enabled; victim must interact with malicious media file (user action required due to UI:R); vulnerable GStreamer version processing APS (Adaptation Parameter Set) units without bounds validation
Impact	The CVSS 7.8 score indicates high severity but with important caveats: Local attack vector (AV:L) and required user interaction (UI:R) significantly reduce real-world risk compared to network-based zero-click vulnerabilities. No EPSS score available suggests limited exploitation data. Not listed in CISA KEV indicates no known active exploitation. The Zero Day Initiative disclosure (ZDI-CAN-28911) shows responsible disclosure without public POC. While the technical impact is severe (full RCE), the exploitation barriers make this a medium-priority patch rather than emergency - attackers need to deliver malicious H.266 content and convince users to process it.
Exploit ScenarioDerived	An attacker crafts a malicious H.266 video file with specially crafted APS units designed to trigger the buffer overflow. The file is distributed via email attachment, malicious website, or file-sharing service. When a victim opens the video in any GStreamer-based application (VLC, Totem, web browser, etc.), the malformed APS data overwrites memory beyond the allocated buffer, allowing the attacker to hijack program execution. Success requires convincing the user to open the file, making social engineering a key component. No public POC exists, requiring significant H.266 codec expertise to exploit.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 13, 2026

CVE-2026-3086 is an out-of-bounds write vulnerability in GStreamer's H.266 codec parser that allows remote code execution when processing malformed APS (Adaptation Parameter Set) units. The vulnerability affects all versions of GStreamer (CPE shows wildcard versioning) and requires user interaction to exploit, such as processing a malicious H.266 video file. No evidence of active exploitation (not in KEV), no public POC, and no EPSS score available yet.

RemediationAI

A patch is available via GitLab commit 025d59cf3459c2903f0384b6b94bc3235e177b53 in the official GStreamer repository. Users should update to the latest GStreamer version containing this fix. As a workaround, disable H.266/VVC codec support if not required, or implement input validation for H.266 streams from untrusted sources. Monitor the official GStreamer security advisories and the Zero Day Initiative advisory ZDI-26-170 for version-specific patch information.

Affected VersionsENISA

GStreamer 1c6e163aa33962f5ee4a87d29319ccdd5cb67612

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Technical ContextAI · show details

GStreamer is a widely-used open-source multimedia framework that processes various audio/video codecs including H.266/VVC (Versatile Video Coding). The vulnerability occurs in the H.266 codec parser when processing APS units - these are parameter sets that configure the decoder for specific video sequences. The flaw is a classic CWE-787 (Out-of-bounds Write) where insufficient validation of user-supplied data in APS units allows writing past allocated buffer boundaries. Based on CPE data (cpe:2.3:a:gstreamer:gstreamer:*:*:*:*:*:*:*:*), all GStreamer versions appear affected.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (zdi) PRIMARY 7.8 HIGH

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SUSE HIGH

Red Hat 7.8 HIGH

Primary rating from Vendor (zdi).

CVSS VectorVendor: zdi

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

GStreamer H.266 Codec Parser Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.

The specific flaw exists within the processing of APS units. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-28911.

Zero Day Initiative Advisories

ZDI-26-170 GStreamer H.266 Codec Parser Out-Of-Bounds Write Remote Code Execution Vulnerability Mar 2026

Executive ViewAI

Why It Matters

A remote code execution vulnerability in GStreamer's H.266 codec parser poses a risk to any organization processing untrusted video content, including media platforms, video conferencing systems, and content management solutions. While currently unpatched and with minimal exploitation indicators, the high severity and wide version coverage necessitate immediate inventory and mitigation planning to prevent potential compromise of affected systems.

Business Impact: High

Compensating Controls

Disable H.266 codec parsing if not required; restrict H.266 video file sources to trusted origins only; implement network segmentation to isolate GStreamer services; block suspicious video files at the gateway using file type validation and sandboxing; run GStreamer processes in containers with restricted privileges; monitor vendor advisories closely for patch availability; consider switching to patched codec libraries or alternative video processing solutions.

Threat Intelligence Overview

EPSS Score

0.1%

Top 81% exploitable

Data Quality

7 sources

Confidence: High

EUVD

CVE.org

EPSS Vendor

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

No

Human Impact

High

Priority Score

39

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +39

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

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Same technique RCE

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Vendor StatusVendor

SUSE

Severity: High

Product	Status
SUSE Linux Enterprise Desktop 15 SP7	Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7	Fixed
SUSE Linux Enterprise Module for Basesystem 15 SP7	Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP7	Fixed

References

Advisories & patches

ADVISORY https://github.com/siyuan-note/siyuan/security/advisories/GHSA-2h2p-mvfx-868w ADVISORY https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/025d59cf3459c2903f0384b6b94bc3235e177b53 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-30869 ADVISORY https://vuldb.com/?id.349628 REF https://access.redhat.com/security/cve/CVE-2026-3086 REF https://bugzilla.redhat.com/show_bug.cgi?id=2447493 REF https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3086.json REF https://www.zerodayinitiative.com/advisories/ZDI-26-170/

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