CVE-2026-53935
Prior to 1.17.16, from 1.18.2 to 1.18.9, and from 1.19.0 to 1.19.3, users with the ability to create CiliumLocalRedirectPolicies can specify arbitrary ClusterIPs via addressMatcher, enabling hijacking traffic to Services in any namespace and bypassing…
Does this matter?
Lower severity and a low EPSS score (0.34%). Track it; it rarely justifies an emergency change on its own.
Description
Cilium is a networking, observability, and security solution. Prior to 1.17.16, from 1.18.2 to 1.18.9, and from 1.19.0 to 1.19.3, users with the ability to create CiliumLocalRedirectPolicies can specify arbitrary ClusterIPs via addressMatcher, enabling hijacking traffic to Services in any namespace and bypassing namespace scoping enforced by serviceMatcher; deleting such a policy can also corrupt Cilium internal service state and stop service translation for the affected Service. This issue is fixed in versions 1.17.16, 1.18.10, and 1.19.4.
- CVSS 3.1
- 6.9 MEDIUMCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H
- EPSS
- 0.34% probability · 27th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-863
- Source
- security-advisories@github.com
References
- https://github.com/cilium/cilium/commit/81d446395673dc2c684c047c12715caffac1a351
- https://github.com/cilium/cilium/commit/92ca32eda85aa0c7611c28221cc26fa08be17ebc
- https://github.com/cilium/cilium/commit/fe7eb53c7aac9fa7ec610b1975d73fbbb198c66d
- https://github.com/cilium/cilium/pull/45412
- https://github.com/cilium/cilium/pull/45584
- https://github.com/cilium/cilium/pull/45585
- https://github.com/cilium/cilium/security/advisories/GHSA-q6h5-q3q6-f87x
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.