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gst-plugins-bad CVE-2026-12892

| EUVDEUVD-2026-38607 MEDIUM
Out-of-bounds Read (CWE-125)
2026-06-23 redhat GHSA-mc62-3gf7-rphg
Buffer Overflow Information Disclosure Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9
4.4
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
4.4 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
vuln.today AI
4.4 MEDIUM

File-based local parsing attack requires active user interaction; 1-byte read limits impact to minimal confidentiality exposure and application crash with no integrity or scope change.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
4.0 AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Red Hat
4.4 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

Lifecycle Timeline

1
Analysis Generated
Jun 23, 2026 - 20:53 vuln.today

DescriptionCVE.org

A flaw was found in GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video file containing malformed MVC or SVC extension slice NAL units, a 1-byte heap out-of-bounds read can occur during parsing. This happens when the parser attempts to check slice boundary information without first verifying that the NAL unit contains enough data beyond the extension header. An attacker could exploit this by tricking a user into opening a malicious H.264 video file, potentially causing the application to crash or leak a single byte of heap memory.

AnalysisAI

Heap out-of-bounds read in GStreamer's gst-plugins-bad H.264 parser allows an attacker to crash a media application or leak a single byte of heap memory by tricking a victim into opening a specially crafted H.264 video file containing malformed MVC or SVC extension slice NAL units. Affected systems span Red Hat Enterprise Linux versions 6 through 10 where gst-plugins-bad is installed. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft H.264 file with malformed MVC/SVC NAL unit
Delivery
Deliver file to victim via social engineering
Exploit
Victim opens file in GStreamer-backed media player
Execution
H.264 parser processes extension slice without length validation
Persist
1-byte heap out-of-bounds read triggered
Impact
Application crash or single-byte heap memory disclosure
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Vulnerability AssessmentAI

Exploitation Exploitation requires that gst-plugins-bad is installed on the target RHEL system and that the victim actively opens a specially crafted H.264 video file (UI:R) containing malformed MVC (Multi-View Coding) or SVC (Scalable Video Coding) extension slice NAL units with insufficient data beyond the extension header. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 score of 4.4 (Medium) is broadly accurate and is supported by the available signals. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malicious H.264 video file embedding a malformed MVC or SVC extension slice NAL unit with a truncated payload, then distributes it via a phishing email, malicious website, or messaging platform. When a victim on an affected RHEL system opens the file in a GStreamer-backed media player (such as Totem, Rhythmbox, or a browser with GStreamer integration), the H.264 parser reads 1 byte past the NAL unit boundary, potentially crashing the application or exposing a single heap byte. …
Remediation Apply patches via standard RHEL update mechanisms (yum update gstreamer1-plugins-bad-free or dnf update gstreamer1-plugins-bad-free) once errata are published; monitor the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-12892 for patch availability and exact fixed version numbers, as no specific patched release is confirmed in the current intelligence. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected

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CVE-2026-12892 vulnerability details – vuln.today
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