Medium severity5.9NVD Advisory· Published Jul 15, 2026· Updated Jul 17, 2026
CVE-2026-56742
CVE-2026-56742
Description
Cilium is a networking, observability, and security solution. Prior to 1.17.17, 1.18.11, and 1.19.5, Cilium clusters using Gateway API allow users with permissions to create or update namespaced HTTPRoutes to mirror HTTP traffic to any Service in any namespace, bypassing the ReferenceGrant authorization mechanism. Gateway API functionality is disabled by default. This issue is fixed in versions 1.17.17, 1.18.11, and 1.19.5.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/cilium/ciliumGo | < 1.17.17 | 1.17.17 |
github.com/cilium/ciliumCiliumGo | >= 1.18.0, < 1.18.11 | 1.18.11 |
github.com/cilium/ciliumGo | >= 1.19.0, < 1.19.5 | 1.19.5 |
Affected products
22- osv-coords20 versionspkg:apk/chainguard/kubescape-server-fips-downloaderpkg:apk/chainguard/hubblepkg:apk/chainguard/hubble-ui-backend-fipspkg:golang/github.com/cilium/ciliumpkg:golang/github.com/cilium/ciliumciliumpkg:apk/chainguard/hubble-fipspkg:apk/chainguard/kubescape-serverpkg:apk/chainguard/kubescape-server-downloaderpkg:apk/wolfi/kubescapepkg:apk/wolfi/kubescape-operatorpkg:apk/chainguard/kubescape-server-fipspkg:apk/chainguard/kubescapepkg:apk/wolfi/hubblepkg:apk/chainguard/kubescape-operatorpkg:apk/wolfi/hubble-ui-backendpkg:bitnami/hubble-relaypkg:apk/chainguard/hubble-ui-backendpkg:apk/chainguard/kubescape-operator-fipspkg:bitnami/cilium-operatorpkg:bitnami/cilium
< 4.0.10-r9+ 19 more
- (no CPE)range: < 4.0.10-r9
- (no CPE)range: < 1.19.4-r6
- (no CPE)range: < 0.13.5-r11
- (no CPE)range: < 1.17.17
- (no CPE)range: >= 1.18.0, < 1.18.11
- (no CPE)range: < 1.19.4-r6
- (no CPE)range: < 4.0.10-r8
- (no CPE)range: < 4.0.10-r8
- (no CPE)range: < 4.0.10-r8
- (no CPE)range: < 0.2.151-r7
- (no CPE)range: < 4.0.10-r9
- (no CPE)range: < 4.0.10-r8
- (no CPE)range: < 1.19.4-r6
- (no CPE)range: < 0.2.151-r7
- (no CPE)range: < 0.13.5-r11
- (no CPE)range: < 1.17.17
- (no CPE)range: < 0.13.5-r11
- (no CPE)range: < 0.2.151-r9
- (no CPE)range: < 1.17.17
- (no CPE)range: < 1.17.17
Patches
Vulnerability mechanics
References
10- github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333debnvdPatchWEB
- github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857nvdPatchWEB
- github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032bnvdPatchWEB
- github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512canvdPatchWEB
- github.com/advisories/GHSA-w7c2-w76w-5hmjghsaADVISORY
- github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmjnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-56742ghsaADVISORY
- github.com/cilium/cilium/releases/tag/v1.17.17nvdRelease NotesWEB
- github.com/cilium/cilium/releases/tag/v1.18.11nvdRelease NotesWEB
- github.com/cilium/cilium/releases/tag/v1.19.5nvdRelease NotesWEB
News mentions
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