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CVE-2026-26963

Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled

MEDIUM
5.4
CVSS Score
Published: February 19, 2026 at 11:38 PM UTC
Updated: June 17, 2026 at 10:26 AM UTC
1 product affected across 1 vendorCilium

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cilium· Cilium
95%
v < 1.18.61.18.0 ≤ v < 1.18.6
Affected range stops below 1.18.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_CONFIRMPatchVendor Advisory
Source: cverecord
https://github.com/cilium/cilium/security/advisories/GHSA-5r23-prx4-mqg3
x_refsource_MISCIssue Tracking
Source: cverecord
https://github.com/cilium/cilium/pull/42892
x_refsource_MISCPatch
Source: cverecord
https://github.com/cilium/cilium/commit/88e28e1e62c0b1a02c3f0fc22d888ac9eefbe885
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/cilium/cilium/releases/tag/v1.18.6

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUM[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-863

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