CVE-2026-32254 json
Kube-router Proxy Module Blindly Trusts ExternalIPs/LoadBalancer IPs Enabling Cluster-Wide Traffic Hijacking and DNS DoS
published 2026-03-17 7 mo ago modified 2026-06-17 4 mo ago also GHSA-phqm-jgc3-qf8g , GO-2026-4724 , EUVD-2026-12757
- cvss
- 7.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 24%
- public exploits
- 0
- none known
Summary
Kube-router is a turnkey solution for Kubernetes networking. Prior to version 2.8.0, Kube-router's proxy module does not validate externalIPs or loadBalancer IPs before programming them into the node's network configuration. Version 2.8.0 contains a patch for the issue. Available workarounds include enabling DenyServiceExternalIPs feature gate, deploying admission policy, restricting service creation RBAC, monitoring service changes, and applying BGP prefix filtering.
Patch / fix
- go github.com/cloudnativelabs/kube-router/v2 2.8.0
- kube-router kube-router 2.8.0
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260326T203309-150000.1.155.2
suse advisories SUSE-SU-2026:1135-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/cloudnativelabs/kube-router/security/advisories/GHSA-phqm-jgc3-qf8g referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H |
| GitHub | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/cloudnativelabs/kube-router/v2 | <2.8.0 |
2.8.0 |
| go | github.com/cloudnativelabs/kube-router | all versions |
no fix listed |
Affected products
- cloudnativelabs kube-router
Classification
- Weakness
-
- CWE-284 Improper Access Control
References
-
github.com
/cloudnativelabs/kube-router/commit/a1f0b2eea3ee0f66b9a5b5c49dcb714619ccd456
web, patch
-
github.com
/cloudnativelabs/kube-router/security/advisories/GHSA-phqm-jgc3-qf8g
exploit, web, mitigation, patch, vendor-advisory, advisory
-
github.com
/cloudnativelabs/kube-router/releases/tag/v2.8.0
web, product, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-32254
advisory
-
github.com
/cloudnativelabs/kube-router
package
Sources
- CVE List CVE-2026-32254
- GitHub Advisory GHSA-phqm-jgc3-qf8g
- NVD CVE-2026-32254
- OSV GO-2026-4724
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.