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CVE-2026-26963

6.1 · MEDIUM

Cilium is a networking, observability, and security solution with an eBPF-based dataplane.

Published Feb 20, 2026CWE-863EPSS 0.18%

Overview

CVE-2026-26963 is a medium-severity vulnerability. It was published on February 20, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885GitHubgithub.com/cilium/cilium/pull/42892GitHubgithub.com/cilium/cilium/releases/tag/v1.18.6GitHubgithub.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-26963?

CVE-2026-26963 is a medium-severity vulnerability. It was published on February 20, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2026-26963?

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-26963?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-26963?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-26963 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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