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GStreamer CVE-2026-18295

| EUVDEUVD-2026-63444 HIGH
Out-of-bounds Write (CWE-787)
2026-08-20 zdi GHSA-jfrx-5cmc-xpfv
Memory Corruption Buffer Overflow RCE Gstreamer
7.8
CVSS 3.0 · Vendor: zdi
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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
vuln.today AI
7.8 HIGH

File-based delivery confirms AV:L; no auth required before file open (PR:N); user must open file (UI:R); full RCE confined to current process with no scope change (S:U, C/I/A:H).

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
8.8 HIGH
qualitative

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

Lifecycle Timeline

2
Analysis Generated
Aug 20, 2026 - 17:32 vuln.today
CVE Published
Aug 20, 2026 - 16:22 cve.org
HIGH 7.8

DescriptionCVE.org

GStreamer MRF File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of MRF files. 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-29510.

AnalysisAI

Remote code execution via malicious MRF media files affects GStreamer across all versions tracked under CPE cpe:2.3:a:gstreamer:gstreamer:*:*:*:*:*:*:*:*. The MRF file parser fails to validate user-supplied input bounds, allowing a heap out-of-bounds write (CWE-787) that corrupts memory and redirects execution to attacker-controlled code within the victim process. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Delivery
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Exploit
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Execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target user opens or previews a crafted MRF media file - for example, by opening it in a GStreamer-backed media player, triggering GNOME Files or Nautilus thumbnail rendering, or loading a web page that causes browser-side GStreamer invocation for media handling. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.0 score of 7.8 (High) with vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H accurately reflects the severity ceiling: full RCE impact but constrained by local attack vector and mandatory user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation The primary fix is to apply the patch referenced in GStreamer's official security advisory sa-2026-0050 at https://gstreamer.freedesktop.org/security/sa-2026-0050.html. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all systems and applications using GStreamer and implement file-type restrictions blocking MRF media files at email and web gateways. …

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

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Same technique Memory Corruption

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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CVE-2026-18295 vulnerability details – vuln.today
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