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CVE-2026-12891— Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: global buffer overflow (oob read) in h.266/vvc vui parameter 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.

GStreamer是GStreamer组织开源的一套用于处理流媒体的框架。 GStreamer存在缓冲区错误漏洞，该漏洞源于GStreamer gst-plugins-bad包中的H.266/VVC解析器在处理恶意构造的长宽比指示值时执行越界读取，可能导致通过视频元数据泄露相邻内存中的敏感信息。以下版本受到影响：Red Hat Enterprise Linux 10版本、Red Hat Enterprise Linux 8版本和Red Hat Enterprise Linux 9版本。

CVSS 4.3 · Medium EPSS 0.39% · P30

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 3

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-12891

Vulnerability Information
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Vulnerability Title
Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: global buffer overflow (oob read) in h.266/vvc vui parameter parser
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the GStreamer gst-plugins-bad package. When processing a malformed H.266/VVC video stream with a crafted aspect ratio indicator value, the H.266 parser performs an out-of-bounds read of up to 8 bytes from adjacent memory. This flaw allows an attacker to craft a malicious H.266 video file or stream that, when processed by a GStreamer-based application, could leak limited memory contents through video metadata, potentially exposing sensitive information from the application's address space.
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:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
GStreamer 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GStreamer是GStreamer组织开源的一套用于处理流媒体的框架。 GStreamer存在缓冲区错误漏洞，该漏洞源于GStreamer gst-plugins-bad包中的H.266/VVC解析器在处理恶意构造的长宽比指示值时执行越界读取，可能导致通过视频元数据泄露相邻内存中的敏感信息。以下版本受到影响：Red Hat Enterprise Linux 10版本、Red Hat Enterprise Linux 8版本和Red Hat Enterprise Linux 9版本。
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 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-12891

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III. Intelligence Information for CVE-2026-12891

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Vendor Advisories for CVE-2026-12891 (2)

Other References for CVE-2026-12891 (1)

Same Patch Batch · Red Hat · 2026-06-23 · 12 CVEs total

CVE-2026-11807 9.6 CRITICAL Eda-server: websocket missing authorization allows credential theft via activation_id spoo
CVE-2026-12112 7.8 HIGH Foreman-mcp-server: mcp server: active session hijacking via insecure session state reuse
CVE-2026-10609 6.8 MEDIUM Openshift/cluster-logging-operator: cluster logging operator creates and forwards servicea
CVE-2026-11820 6.5 MEDIUM Community.general: community.general nexmo — api credentials exposed in get url query stri
CVE-2026-9073 6.2 MEDIUM Foreman-mcp-server: mcp server: insecure sensitive http header sanitization
CVE-2026-11819 5.5 MEDIUM Community.general: community.general keyring_info — os keyring passphrase returned in plai
CVE-2026-12969 5.3 MEDIUM Dnsmasq: dnsmasq: out-of-bounds read in find_soa() due to missing extrabytes validation
CVE-2026-55655 5.0 MEDIUM Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat ente
CVE-2026-12892 4.4 MEDIUM Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad: 1-byte heap out-of-bounds read in h.2
CVE-2026-55653 4.3 MEDIUM Openssh: double free in red hat enterprise linux versions of openssh dh-gex client path du
CVE-2026-55654 3.7 LOW Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi in

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-12891

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