Answer in brief
CVE-2026-53935 records a Medium severity (CVSS 6.9) vulnerability in CiliumLocalRedirectPolicy addressMatcher allows cross-namespace service traffic hijacking and can break service translation. The current sources do not mark it as known exploited. The current feed maps cilium/cilium (generic), github.com/cilium/cilium (go), github.com/cilium/cilium (go), github.com/cilium/cilium (go) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps cilium/cilium (generic), github.com/cilium/cilium (go), github.com/cilium/cilium (go), github.com/cilium/cilium (go) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| cilium/ciliumgeneric | < 1.17.16 || >= 1.18.2, < 1.18.10 || >= 1.19.0, < 1.19.4 | Not reported |
| github.com/cilium/ciliumgo | >=1.19.0,<1.19.4 | 1.19.4 |
| github.com/cilium/ciliumgo | >=1.18.2,<1.18.10 | 1.18.10 |
| github.com/cilium/ciliumgo | <1.17.16 | 1.17.16 |
| github.com/cilium/ciliumgo | >=1.19.0 <1.19.4 | 1.19.4 |
| github.com/cilium/ciliumgo | >=1.18.2 <1.18.10 | 1.18.10 |
| github.com/cilium/ciliumgo | >=0 <1.17.16 | 1.17.16 |
| github.com/cilium/ciliumgo | >=0 <1.17.16 >=1.18.2 <1.18.10 >=1.19.0 <1.19.4 | 1.17.16, 1.18.10, 1.19.4 |
Published upstream
Jul 7, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 6, 2026
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.
Quoted source text, attributed separately from HOL analysis.