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Red Hat Enterprise Linux 10 CVE-2026-0967

| EUVD-2026-16332 MEDIUM
Inefficient Regular Expression Complexity (ReDoS) (CWE-1333)
2026-03-26 redhat GHSA-6jpg-fr24-wpvf
Denial Of Service 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 Red Hat Openshift Container Platform 4
5.5
CVSS 3.1 · NVD
Temporal: 2.2
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CIRCL (temporal)
2.2 LOW
cvss
Ubuntu
MEDIUM
qualitative
SUSE
2.2 LOW
AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Red Hat
2.2 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 26, 2026 - 20:31 euvd
EUVD-2026-16332
Analysis Generated
Mar 26, 2026 - 20:31 vuln.today
CVE Published
Mar 26, 2026 - 20:06 nvd
MEDIUM 5.5

DescriptionCVE.org

A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the match_pattern() function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in a Denial of Service (DoS) for the client.

AnalysisAI

libssh's match_pattern() function is vulnerable to ReDoS (Regular Expression Denial of Service) attacks when processing maliciously crafted hostnames in client configuration or known_hosts files, allowing local attackers with limited privileges and user interaction to trigger inefficient regex backtracking that exhausts system resources and causes client-side timeouts. The vulnerability affects Red Hat Enterprise Linux 6-10 and OpenShift Container Platform 4, with CVSS 2.2 reflecting low severity due to local attack vector and high complexity requirements, though the denial of service impact warrants attention in environments where SSH client availability is critical.

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Vulnerability AssessmentAI

Risk Assessment The CVSS 3.0 vector (AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L) indicates a local-only attack requiring limited privileges, high complexity, and user interaction to trigger, with impact limited to availability (low severity). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with local system access (e.g., a non-root user on a shared system) crafts a malicious entry in the shared or user-specific known_hosts file or .ssh/config with a hostname pattern such as '(a+)+b' or similar polynomial/exponential backtracking pattern. When the SSH client is invoked by the victim (with user interaction) and calls match_pattern() to validate the hostname against this crafted pattern, the regex engine enters pathological backtracking, consuming CPU and memory until the operation times out or the system becomes unresponsive. …
Remediation Apply the vendor-released patch from Red Hat by upgrading libssh to the patched version released in the security advisory available at https://access.redhat.com/security/cve/CVE-2026-0967 and https://bugzilla.redhat.com/show_bug.cgi?id=2436981. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

During next maintenance window: Apply vendor patches when convenient. …

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Vendor StatusVendor

Ubuntu

Priority: Medium
libssh
Release Status Version
upstream released 0.11.4
jammy released 0.9.6-2ubuntu0.22.04.6
noble released 0.10.6-2ubuntu0.3
questing released 0.11.2-1ubuntu0.2
bionic released 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6
focal released 0.9.3-2ubuntu2.5+esm3
xenial released 0.6.3-4.3ubuntu0.6+esm4
USN-8051-1 USN-8051-2

Debian

Bug #1127693
libssh
Release Status Fixed Version Urgency
bullseye vulnerable 0.9.8-0+deb11u1 -
bullseye (security) vulnerable 0.9.8-0+deb11u2 -
bookworm vulnerable 0.10.6-0+deb12u2 -
bookworm (security) vulnerable 0.10.6-0+deb12u1 -
trixie vulnerable 0.11.2-1+deb13u1 -
forky vulnerable 0.11.3-1 -
sid fixed 0.12.0-3 -
(unstable) fixed 0.12.0-1 -

SUSE

Severity: Low
Product Status
Container private-registry/harbor-trivy-adapter:1.1.1-1.40 Container suse/manager/5.0/x86_64/server:latest Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-EC2 Image SLES15-SP7-CHOST-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-SAP-BYOS-EC2 Image SLES15-SP7-SAP-GCE-3P Image SLES15-SP7-SAP-Hardened-BYOS-EC2 Image pr_15_7 Affected
Container suse/ltss/sle12.5/sles12sp5:8.5.205 Image SLES12-SP5-EC2-SAP-BYOS Image SLES12-SP5-SAP-Azure-LI-BYOS-Production Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production Affected
Container suse/sl-micro/6.0/baremetal-os-container:latest Container suse/sl-micro/6.0/base-os-container:latest Container suse/sl-micro/6.0/kvm-os-container:latest Container suse/sl-micro/6.0/rt-os-container:latest Container suse/sl-micro/6.0/toolbox:latest Affected
Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.59 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.80 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.85 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.73 Image SL-Micro-Base Image SL-Micro-Base-RT Image SL-Micro-Base-RT-SelfInstall Image SL-Micro-Base-RT-encrypted Image SL-Micro-Base-SelfInstall Image SL-Micro-Base-encrypted Image SL-Micro-Base-qcow Image SL-Micro-Default Image SL-Micro-Default-SelfInstall Image SL-Micro-Default-encrypted Image SL-Micro-Default-qcow Image SL-Micro-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
Container suse/sle-micro-rancher/5.2:latest Container suse/sle-micro/5.2/toolbox:14.2-7.11.242 Affected

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CVE-2026-0967 vulnerability details – vuln.today
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