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CVE-2026-53703— Gstreamer1-plugins-ugly-free: gstreamer: out-of-bounds read in realmedia demuxer audio stream header parser

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

RealMedia demuxer是GStreamer组织的一个核心组件。 GStreamer RealMedia demuxer存在缓冲区错误漏洞，该漏洞源于在解析RealMedia文件时，未检查MDPR块中是否包含足够的数据，可能导致缓冲区越界读取，造成应用程序崩溃，甚至将越界字节合并到流元数据中，导致有限的信息泄露。

CVSS 7.1 · High EPSS 0.46% · P38

Affected Version Matrix 6

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 0:1.26.7-2.el10_2.1< * unaffected
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.24.11-1.el10_0.2< * unaffected
Red Hat Red Hat Enterprise Linux 7 any unaffected
Red Hat Red Hat Enterprise Linux 8 any unaffected
Red Hat Red Hat Enterprise Linux 9 0:1.22.12-6.el9_8.1< * unaffected
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.22.12-4.el9_6.1< * unaffected
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I. Basic Information for CVE-2026-53703

Vulnerability Information
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Vulnerability Title
Gstreamer1-plugins-ugly-free: gstreamer: out-of-bounds read in realmedia demuxer audio stream header parser
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
GStreamer RealMedia demuxer 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RealMedia demuxer是GStreamer组织的一个核心组件。 GStreamer RealMedia demuxer存在缓冲区错误漏洞，该漏洞源于在解析RealMedia文件时，未检查MDPR块中是否包含足够的数据，可能导致缓冲区越界读取，造成应用程序崩溃，甚至将越界字节合并到流元数据中，导致有限的信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 0:1.26.7-2.el10_2.1 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.24.11-1.el10_0.2 ~ * cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat Red Hat Enterprise Linux 9 0:1.22.12-6.el9_8.1 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.22.12-4.el9_6.1 ~ * cpe:/a:redhat:rhel_eus:9.6::appstream
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8

II. Public POCs for CVE-2026-53703

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III. Intelligence Information for CVE-2026-53703

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Vendor Advisories for CVE-2026-53703 (5)

Other References for CVE-2026-53703 (1)

Same Patch Batch · Red Hat · 2026-06-15 · 9 CVEs total

CVE-2026-52720 8.8 HIGH Gstreamer1-plugins-bad-free: gstreamer: heap buffer overflow via crafted vnc server rectan
CVE-2026-53705 7.6 HIGH Gstreamer1-plugins-good: gstreamer: heap buffer overflow in wavpack decoder via integer ov
CVE-2026-52722 7.1 HIGH Gstreamer1-plugins-bad-free: gstreamer: signed integer overflow in vmnc decoder cursor pay
CVE-2026-53704 7.1 HIGH Gstreamer1-plugins-ugly-free: gstreamer: out-of-bounds read in realmedia demuxer fileinfo
CVE-2026-52719 7.1 HIGH Gstreamer1-plugins-bad-free: gstreamer: out-of-bounds read via jpeg segment length validat
CVE-2026-52718 6.5 MEDIUM Gstreamer1-plugins-bad-free: gstreamer: denial of service via av1 tile_list_obu parser byt
CVE-2026-52721 5.3 MEDIUM Gstreamer1-plugins-bad-free: gstreamer: multiple out-of-bounds reads in pcapparse ipv4/tcp
CVE-2026-44188 5.3 MEDIUM Ansible-lightspeed: ansible lightspeed: session hijacking and unauthorized data access due

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-125

V. Comments for CVE-2026-53703

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