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Vulnerability record · CVE-2026-53704 · published 15 June 2026

CVE-2026-53704: Out-of-bounds read vulnerability

A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia file containing a specially crafted FILEINFO metadata section, the demuxer parses variable-name and variable-value pairs using re_skip_pascal_string() without validating that offsets remain within the mapped buffer. Additionally, the element count controlling the parsing loop is read from attacker-controlled data without validation, which can cause an infinite loop. A crafted RealMedia file can cause the application to crash, hang, or potentially read limited adjacent memory contents.

7.1 CVSS 3.1 High EPSS 0.46% · top 62.7% CWE-125 · Out-of-bounds read Awaiting Analysis
7.1CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
8 Sep 2026Last modified by NVD

Description

A flaw was found in GStreamer's RealMedia demuxer in the gst-plugins-ugly package. When processing a RealMedia file containing a specially crafted FILEINFO metadata section, the demuxer parses variable-name and variable-value pairs using re_skip_pascal_string() without validating that offsets remain within the mapped buffer. Additionally, the element count controlling the parsing loop is read from attacker-controlled data without validation, which can cause an infinite loop. A crafted RealMedia file can cause the application to crash, hang, or potentially read limited adjacent memory contents.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:36673
https://access.redhat.com/errata/RHSA-2026:36674
https://access.redhat.com/errata/RHSA-2026:50688
https://access.redhat.com/errata/RHSA-2026:50691
https://access.redhat.com/security/cve/CVE-2026-53704
https://bugzilla.redhat.com/show_bug.cgi?id=2487614

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Source: NIST National Vulnerability Database (record CVE-2026-53704), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.