PatchSiren cyber security CVE debrief
CVE-2026-53704 Red Hat CVE debrief
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.
- Vendor
- Red Hat
- Product
- Red Hat Enterprise Linux 10
- CVSS
- HIGH 7.1
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-15
- Original CVE updated
- 2026-06-15
- Advisory published
- 2026-06-15
- Advisory updated
- 2026-06-15
Who should care
Users of GStreamer's RealMedia demuxer, particularly those using the gst-plugins-ugly package, should be aware of this vulnerability. Successful exploitation could lead to application crashes, hangs, or limited information disclosure.
Technical summary
The vulnerability exists in the RealMedia demuxer of GStreamer's gst-plugins-ugly package. It is caused by improper validation of offsets and element counts when parsing FILEINFO metadata sections in RealMedia files. This can lead to infinite loops, crashes, or limited memory reads.
Defensive priority
HIGH
Recommended defensive actions
- Apply patches or updates provided by the vendor as soon as they become available.
- Restrict the processing of RealMedia files from untrusted sources.
- Monitor for and respond to potential exploitation attempts.
Evidence notes
The CVE-2026-53704 record was published on [cve-org]. The NVD provides additional details [nvd]. Red Hat has also published information on this vulnerability [ref-4] and a related bug report [ref-5].
Official resources
CVE-2026-53704 was published on 2026-06-15T20:16:33.697Z and modified on 2026-06-15T21:09:52.020Z.