CVE-2026-125704
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GStreamer Core Buffer Deserialization Use-After-Free

Vulnerability report for CVE-2026-125704, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-11-10

Last updated on: 2026-11-10

Assigner: redhat-SADP

Description

A use-after-free flaw was found in GStreamer core buffer value deserialization. When crafted serialized buffer data contains an invalid character, an error path frees a mapped buffer before unmapping it. An application that parses untrusted caps or structure data could crash; a network-facing GStreamer Data Protocol receiver can process such data without user interaction. Further impact has not been established.

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Meta Information

Published
2026-11-10
Last Modified
2026-11-10
Generated
2026-11-10
AI Q&A
2026-11-10
EPSS Evaluated
N/A
NVD
EUVD

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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Executive Summary

CVE-2026-125704 is a use-after-free vulnerability in GStreamer core buffer value deserialization. When invalid character data in serialized buffer data triggers an error path, it frees a mapped buffer before unmapping it. This can cause applications parsing untrusted caps or structure data to crash, especially in network-facing GStreamer Data Protocol receivers.

Detection Guidance

Detecting this vulnerability requires monitoring for crashes in GStreamer applications processing untrusted data. Check system logs for segmentation faults in GStreamer-related processes. Use tools like gdb to analyze core dumps from crashed applications. Monitor network traffic for malformed GStreamer Data Protocol packets if running a receiver. No specific commands are provided in the resources.

Impact Analysis

This vulnerability can cause applications to crash, leading to denial-of-service. Network-facing receivers processing untrusted data are particularly at risk. In rare cases, it may allow arbitrary code execution if exploited under specific conditions.

Mitigation Strategies

Restrict access to network-facing GStreamer Data Protocol receivers to trusted peers only. Avoid passing externally supplied strings to functions like gst_caps_from_string() or gst_structure_from_string(). Update GStreamer core to version 1.28.3 or later if available. Monitor for patches for affected Red Hat Enterprise Linux versions.

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