Out-of-bounds Read in Red Hat Enterprise Linux 10
CVE-2026-53703
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (37.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.005 · change: +0.002
Affected products
- Red Hat Enterprise Linux 10 — versions 0:1.26.7-2.el10_2.1
- Red Hat Enterprise Linux 10.0 Extended Update Support — versions 0:1.24.11-1.el10_0.2
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9 — versions 0:1.22.12-6.el9_8.1
- Red Hat Enterprise Linux 9.6 Extended Update Support — versions 0:1.22.12-4.el9_6.1
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-53703 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- access.redhat.com/errata/RHSA-2026:36673 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:36674 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:50688 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:50691 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-53703?
- CVE-2026-53703 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2026-06-15.
- How severe is CVE-2026-53703?
- High severity. CVSS v3 base score is 7.1 out of 10.