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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.

PUBLISHED Reserved 2026-06-10 | Published 2026-06-15 | Updated 2026-06-15 | Assigner redhat




HIGH: 7.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Problem types

Out-of-bounds Read

Product status

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Timeline

2026-04-16:Reported to Red Hat.
2026-06-12:Made public.

Credits

Red Hat would like to thank Tianshuo Han for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-53704 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2487614 (RHBZ#2487614) issue-tracking

cve.org (CVE-2026-53704)

nvd.nist.gov (CVE-2026-53704)

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