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Gstreamer CVE-2026-2923

| EUVDEUVD-2026-12119 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

  1. Access
    Craft malicious DVB subtitle file
  2. Delivery
    Open file with GStreamer application
  3. Exploit
    Trigger coordinate parsing in subtitle handler
  4. Execution
    Write past buffer boundary
  5. Impact
    Execute arbitrary code

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A06:2021 - Vulnerable and Outdated Components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.

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Exploitation Conditions

User interaction required to open malicious DVB subtitle file in GStreamer-based application. Affects GStreamer installations with DVB subtitle decoding capability enabled.
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-exploitable vulnerabilities. No EPSS data provided suggests limited exploitation probability assessment. Not listed in KEV indicates no known active exploitation. The ZDI advisory (ZDI-CAN-28838) shows responsible disclosure but no public POC. Using SSVC framework: exploitation status (none known), automatable (no - requires user interaction), technical impact (total - RCE). This is a legitimate high-impact vulnerability but with limited exploitability compared to remotely exploitable flaws. Priority should be moderate to high depending on GStreamer usage context.
Exploit ScenarioDerived

An attacker would need to craft a malicious media file containing DVB subtitles with specially crafted coordinate values that trigger the buffer overflow. The victim must open or process this file using a vulnerable GStreamer installation. Given the local attack vector and user interaction requirement, likely scenarios include: malicious media files distributed via email, web downloads, or file sharing. The attacker gains code execution in the context of the media player process, potentially leading to full system compromise depending on process privileges. No public POC exists, requiring attackers to reverse-engineer the patch to develop exploits.
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-2026-2923 is an out-of-bounds write vulnerability in GStreamer's DVB Subtitles handling that allows remote code execution when processing malformed subtitle coordinates. This vulnerability affects all versions of GStreamer (CPE indicates no version restrictions) and requires user interaction to exploit, though attack vectors may vary by implementation. No evidence of active exploitation (not in KEV), no public POC available, and no EPSS data provided.

RemediationAI

A patch is available via GStreamer GitLab commit 3b8253f447bcc9831dbf643d2c69b205fedbe086. Users should update to GStreamer versions containing this fix. As a workaround, disable DVB subtitle processing if not required, or implement strict input validation for media files from untrusted sources. The GitLab commit link (https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/3b8253f447bcc9831dbf643d2c69b205fedbe086) provides the specific code changes addressing the coordinate validation issue.

Affected VersionsENISA

GStreamer 1c6e163aa33962f5ee4a87d29319ccdd5cb67612

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Technical ContextAI · show details

GStreamer is a multimedia framework library used for building media handling components. The vulnerability occurs in the DVB (Digital Video Broadcasting) Subtitles parsing component when processing coordinate data. According to CWE-787 (Out-of-bounds Write), the flaw stems from insufficient validation of user-supplied coordinate values, allowing writes beyond allocated buffer boundaries. The CPE string (cpe:2.3:a:gstreamer:gstreamer:*:*:*:*:*:*:*:*) indicates all GStreamer versions are affected. This is a classic buffer overflow in multimedia parsing code, a common attack surface in media libraries.

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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 DVB Subtitles 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 handling of coordinates. 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-28838.

Zero Day Initiative Advisories

ZDI-26-161 GStreamer DVB Subtitles Out-Of-Bounds Write Remote Code Execution Vulnerability Mar 2026

Executive ViewAI

Why It Matters

CVE-2026-2923 is a high-severity remote code execution vulnerability in GStreamer's subtitle processing that could allow attackers to execute arbitrary code on systems processing untrusted video content. Organizations using GStreamer for media processing-particularly streaming platforms, broadcast systems, and video conferencing applications-should assess exposure immediately, as no patch is currently available.

Business Impact: High
Compensating Controls

Disable DVB subtitle decoding if not operationally required; implement strict input validation and sanitization for subtitle files before processing; restrict GStreamer processes to isolated sandboxed environments with minimal privileges; segment media processing systems from production networks using network access controls; monitor GStreamer upstream repositories for patch availability; consider using alternative media processing libraries with active security support if DVB subtitle support is non-critical.

Threat Intelligence Overview

EPSS Score
0.1%
Top 81% exploitable
Data Quality
6 sources
Confidence: High
EUVD NVD CVE.org EPSS Vendor 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.

Related Vulnerabilities in GStreamer Media Parsing Buffer Overflow and Integer Overflow

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CVE-2026-3084 HIGH
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CVE-2016-9636 CRITICAL POC
9.8 Jan 27

Heap-based buffer overflow in the flx_decode_delta_fli function in gst/flx/gstflxdec.c in the FLIC decoder in GStreamer

CVE-2016-9635 CRITICAL POC
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Heap-based buffer overflow in the flx_decode_delta_fli function in gst/flx/gstflxdec.c in the FLIC decoder in GStreamer

CVE-2016-9634 CRITICAL POC
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Heap-based buffer overflow in the flx_decode_delta_fli function in gst/flx/gstflxdec.c in the FLIC decoder in GStreamer

CVE-2016-9808 HIGH POC
7.5 Jan 13

The FLIC decoder in GStreamer before 1.10.2 allows remote attackers to cause a denial of service (out-of-bounds write an
CVE-2019-9928 HIGH
8.8 Apr 24

A heap-based buffer overflow vulnerability exists in GStreamer's RTSP connection parser that allows remote attackers to

CVE-2025-47219 HIGH POC
8.1 Aug 07

A heap buffer over-read vulnerability exists in GStreamer's isomp4 plugin that allows reading past allocated memory boun
CVE-2022-1920 HIGH POC
7.8 Jul 19

An integer overflow vulnerability in the GStreamer multimedia framework's matroska demuxer allows heap memory corruption
CVE-2022-2122 HIGH POC
7.8 Jul 19

A critical integer overflow vulnerability in GStreamer's qtdemux element allows attackers to trigger denial of service o
CVE-2022-1924 HIGH POC
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A critical integer overflow vulnerability in the GStreamer multimedia framework's Matroska (MKV) demuxer can cause denia
CVE-2022-1922 HIGH POC
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An integer overflow vulnerability in GStreamer's Matroska demuxer can cause denial of service or potentially heap memory
CVE-2022-1921 HIGH POC
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An integer overflow vulnerability in GStreamer's AVI demux element allows attackers to trigger a heap overwrite when par
CVE-2022-1925 HIGH POC
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A heap overflow vulnerability exists in GStreamer's matroskaparse element due to an integer overflow in the gst_matroska

Same weakness CWE-787 – Out-of-bounds Write

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CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2012-1889 HIGH POC
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CVE-2010-3333 HIGH POC
7.8
CVE-2014-1761 HIGH POC
7.8
CVE-2009-3129 HIGH POC
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CVE-2021-1732 HIGH POC
7.8
CVE-2013-3346 CRITICAL POC
9.8

Same technique RCE

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CVE-2021-44228 CRITICAL POC
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CVE-2017-7269 CRITICAL POC
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CVE-2022-47966 CRITICAL POC
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CVE-2012-4681 CRITICAL POC
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CVE-2023-3519 CRITICAL POC
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CVE-2015-5119 CRITICAL POC
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CVE-2016-4117 CRITICAL POC
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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

References

Advisories & patches
ADVISORY https://access.redhat.com/errata/RHSA-2026:6259 ADVISORY https://access.redhat.com/errata/RHSA-2026:6300 ADVISORY https://access.redhat.com/errata/RHSA-2026:6750 ADVISORY https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/3b8253f447bcc9831dbf643d2c69b205fedbe086 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-2923 ADVISORY https://vuldb.com/?id.349622 REF https://access.redhat.com/errata/RHSA-2026:19024 REF https://access.redhat.com/errata/RHSA-2026:19180 REF https://access.redhat.com/errata/RHSA-2026:8854 REF https://access.redhat.com/errata/RHSA-2026:8862 REF https://access.redhat.com/security/cve/CVE-2026-2923 REF https://bugzilla.redhat.com/show_bug.cgi?id=2447503 REF https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2923.json REF https://www.zerodayinitiative.com/advisories/ZDI-26-161/

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