CVE-2026-26963

MEDIUM
2026-02-20 [email protected] GHSA-5r23-prx4-mqg3
6.1
CVSS 3.1
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CVSS Vector

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

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 22:04 vuln.today
Patch Released
Feb 20, 2026 - 20:12 nvd
Patch available
CVE Published
Feb 20, 2026 - 00:16 nvd
MEDIUM 6.1

Tags

Wireguard Cilium Redhat Suse

Description

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6.

Analysis

Cilium versions 1.18.0-1.18.5 with Native Routing, WireGuard, and Node Encryption enabled incorrectly allow cross-node Pod traffic that should be blocked, enabling unauthorized network access between isolated workloads. An attacker with network access to pods on different nodes can bypass network segmentation policies to access restricted services. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

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Priority Score

31
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +30
POC: 0

Vendor Status

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CVE-2026-26963 vulnerability details – vuln.today
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