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CVE-2026-53703

7.1 · HIGH

A vulnerability was found in the GStreamer RealMedia demuxer (gst-plugins-ugly).

Published Jun 15, 2026CWE-125EPSS 0.46%

Overview

CVE-2026-53703 is a high-severity vulnerability. It was published on June 15, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A vulnerability was found in the GStreamer RealMedia demuxer (gst-plugins-ugly). When processing a RealMedia (.rm) file, the demuxer parses MDPR (media properties) chunks to configure audio streams. For audio stream header versions 4 and 5, the parser reads fields such as codec type, packet size, sample rate, channel count, and extra codec data length from fixed offsets within the chunk without first checking that the chunk contains enough data. If a malicious file provides an MDPR chunk that is too small to contain a complete audio stream header, the parser reads beyond the end of the buffer. This can cause the application to crash. In some cases, bytes read past the buffer boundary may be incorporated into stream metadata, which could result in limited information disclosure.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHSA-2026:36673Refaccess.redhat.com/errata/RHSA-2026:36674Refaccess.redhat.com/errata/RHSA-2026:50688Refaccess.redhat.com/errata/RHSA-2026:50691Refaccess.redhat.com/security/cve/CVE-2026-53703Refbugzilla.redhat.com/show_bug.cgi?id=2487613

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53703?

CVE-2026-53703 is a high-severity vulnerability. It was published on June 15, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-53703?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-53703?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-53703?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53703 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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