Gstreamer CVE-2025-47808

MEDIUM

NULL Pointer Dereference (CWE-476)

2025-08-07 cve@mitre.org

Denial Of Service Red Hat Gstreamer Suse

5.6

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-476 OWASP Top 10:2025 A10:2025 - Mishandling of Exceptional Conditions ASVS 5.0 V16 - Security Logging and Error Handling Null pointer safety, defensive checks MITRE ATT&CK 1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	The CVSS 3.1 score of 5.6 (Medium) reflects a network-accessible vulnerability with high attack complexity (AC:H), requiring no privileges or user interaction. However, the EPSS score of 0.09% (25th percentile) suggests minimal real-world exploitation likelihood. The vulnerability causes denial of service with some information disclosure potential (CIA triad impact), but exploitation requires a specially crafted subtitle file and moderate attack complexity. The availability of public POC code increases theoretical risk, but the lack of KEV (Known Exploited Vulnerability) status and extremely low EPSS percentile indicate this remains a low-priority issue in actual threat landscapes. This is a classic example of high CVSS scoring that does not translate to high exploitation risk—primarily affecting applications that parse untrusted subtitle files from network sources, which is not a common attack vector in most deployments.
Exploit ScenarioDerived	An attacker crafts a malicious subtitle file in TMPlayer format with missing or malformed entries designed to trigger a null pointer dereference in the tmplayer_parse_line function. This file is either served via a media streaming service, embedded in a video file, or hosted on a website where a user's GStreamer-based media player or application attempts to parse it. When the vulnerable subparse plugin processes the file, it crashes, denying service to the media playback. A public proof-of-concept is available on GitHub (Atredis Partners advisory), reducing the barrier to exploitation, though successful exploitation requires that the target application accepts and parses the malicious subtitle file.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 17, 2026

A null pointer dereference vulnerability exists in GStreamer's subparse plugin, specifically in the tmplayer_parse_line function when processing malformed subtitle files. This affects GStreamer through version 1.26.1 and can be triggered by an unauthenticated attacker over the network with moderate complexity, resulting in application crash (denial of service) and potential information disclosure. A public proof-of-concept exploit is available, but the EPSS score of 0.09% (25th percentile) indicates relatively low real-world exploitation probability despite POC availability.

RemediationAI

Upgrade GStreamer to the patched version released after 1.26.1; consult the official GStreamer security advisory at https://gstreamer.freedesktop.org/security/ for the exact fixed version number and installation instructions. If immediate patching is not possible, implement validation and sanitization of subtitle files before passing them to the GStreamer parser, restrict subtitle source inputs to trusted and verified files only, and consider deploying media applications in sandboxed environments to limit crash impact. For applications consuming untrusted subtitle files from network sources, enforce strict input validation and error handling to gracefully manage malformed subtitle content.

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Technical ContextAI · show details

GStreamer is a multimedia framework that handles audio and video processing across multiple platforms. The subparse plugin is responsible for parsing subtitle formats, including the TMPlayer subtitle format. The vulnerability exists in the tmplayer_parse_line function (CWE-476: Null Pointer Dereference), where insufficient input validation or bounds checking on subtitle file contents allows the parser to dereference a NULL pointer during processing. This occurs when the parser encounters malformed subtitle entries that lack expected data structures or contain unexpected formatting. The affected software is identified via CPE (cpe:2.3:a:gstreamer:gstreamer:*:*:*:*:*:*:*:*), indicating all versions of GStreamer up to and including 1.26.1 are vulnerable.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.6 MEDIUM

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

SUSE MEDIUM

Red Hat 5.6 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Lifecycle Timeline

3

Patch released

Apr 06, 2026 - 08:30 nvd

Patch available

PoC Detected

Mar 17, 2026 - 15:52 vuln.today

Public exploit code

CVE Published

Aug 07, 2025 - 20:15 nvd

MEDIUM 5.6

DescriptionCVE.org

In GStreamer through 1.26.1, the subparse plugin's tmplayer_parse_line function may dereference a NULL pointer while parsing a subtitle file, leading to a crash.

Executive ViewAI

Why It Matters

Organizations using GStreamer should be aware of moderate risk from CVE-2025-47808, a null pointer dereference vulnerability rated CVSS 5.6. Exploitation could compromise the security of affected deployments. Proof-of-concept code is publicly available. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low

Compensating Controls

Apply vendor patch. If patching is delayed: enable ASLR/DEP, apply network segmentation.

Threat Intelligence Overview

EPSS Score

0.1%

Top 75% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

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 MEDIUM

CISA KEV No

Public POC Yes

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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

Poc

System Exposure· derived

Open

Automatable· derived

No

Human Impact

Low

Priority Score

48

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +28

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:gstreamer:gstreamer:*:*:*:*:*:*:*:*

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Vendor StatusVendor

SUSE

Severity: Medium

Product	Status
Container suse/sl-micro/6.0/baremetal-os-container:latest	Affected
SUSE Enterprise Storage 7.1	Fixed
SUSE Linux Enterprise Desktop 15 SP6 SUSE Linux Enterprise High Performance Computing 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Server 15 SP6 SUSE Linux Enterprise Server for SAP Applications 15 SP6	Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7	Fixed
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS	Fixed

References

Advisories & patches

ADVISORY https://gstreamer.freedesktop.org/security/ ADVISORY https://vuldb.com/?id.319191 ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:02020/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:02302/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:02304/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:02472/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:02796/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:02919/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:20507/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:20751/

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