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Red Hat Enterprise Linux 10 CVE-2026-5673

| EUVDEUVD-2026-19219 MEDIUM
Out-of-bounds Read (CWE-125)
2026-04-06 redhat
5.6
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.6 MEDIUM
AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H
SUSE
MEDIUM
qualitative
Red Hat
5.6 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

3
EUVD ID Assigned
Apr 06, 2026 - 10:00 euvd
EUVD-2026-19219
Analysis Generated
Apr 06, 2026 - 10:00 vuln.today
CVE Published
Apr 06, 2026 - 09:22 nvd
MEDIUM 5.6

DescriptionCVE.org

A flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker could exploit this by tricking a user into opening a specially crafted AVI file containing a truncated header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive information from the heap.

AnalysisAI

Heap-based out-of-bounds read in libtheora's AVI parser allows local attackers with limited privileges to trigger application crashes or leak heap memory via specially crafted AVI files with truncated header sub-chunks. The vulnerability affects Red Hat Enterprise Linux versions 6 through 10 and requires user interaction (opening a malicious file), with real-world impact limited to denial-of-service and potential information disclosure rather than code execution.

Technical ContextAI

libtheora is an open-source video codec library that includes AVI file format parsing functionality. The vulnerability exists in the avi_parse_input_file() function, which processes Audio Video Interleave format files. The flaw is classified as CWE-125 (Out-of-bounds Read), a memory safety issue where the parser fails to properly validate the size or boundaries of header sub-chunks before reading them. When a truncated or malformed header is encountered, the parser attempts to access memory beyond allocated heap boundaries, resulting in either reading sensitive data or triggering a segmentation fault. This type of vulnerability is common in binary format parsers that lack strict bounds checking on variable-length structures.

RemediationAI

Apply security updates from Red Hat Enterprise Linux for the libtheora package. For RHEL 6, 7, 8, 9, and 10 systems, execute the appropriate package manager update command (yum update libtheora on RHEL 6/7, dnf update libtheora on RHEL 8+) to install patched versions. Verify patched version availability at https://access.redhat.com/security/cve/CVE-2026-5673. As a workaround pending patching, restrict processing of AVI files to trusted sources only and consider disabling AVI file format support in media players if not required for operational needs. Upstream patch information is tracked at https://github.com/xiph/theora/issues/24; organizations using libtheora from upstream sources should monitor that repository for security commits. Verify patch application with 'rpm -q libtheora' post-update to confirm version change.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed
SUSE Linux Enterprise Micro 5.4 Fixed

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CVE-2026-5673 vulnerability details – vuln.today

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