TI-2025-16856 Aliases CVE-2025-23047 GHSA-h78m-j95m-5356

Cilium vulnerable to information leakage via insecure default Hubble UI CORS header

LOW 29CWE-200Published 2025-01-22 · Updated 2025-02-12

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200.

Summary

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. An insecure default `Access-Control-Allow-Origin` header value could lead to sensitive data exposure for users of Cilium versions 1.14.0 through 1.14.7, 1.15.0 through 1.15.11, and 1.16.0 through 1.16.4 who deploy Hubble UI using either Cilium CLI or via the Cilium Helm chart. A user with access to a Hubble UI instance affected by this issue could leak configuration details about the Kubernetes cluster which Hubble UI is monitoring, including node names, IP addresses, and other metadata about workloads and the cluster networking configuration. In order for this vulnerability to be exploited, a victim would have to first visit a malicious page. This issue is fixed in Cilium v1.14.18, v1.15.12, and v1.16.5. As a workaround, users who deploy Hubble UI using the Cilium Helm chart directly can remove the CORS headers from the Helm template as shown in the patch from commit a3489f190ba6e87b5336ee685fb6c80b1270d06d.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00489 42nd percentileScored 2026-11-07

Fix Fixed cilium (cilium): 1.14.18, 1.15.12, 1.16.5github.com/cilium/cilium (Go): 1.14.19, 1.15.13, 1.16.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
cilium	cilium	1.14.0 to before 1.14.18; 1.15.0 to before 1.15.12; 1.16.0 to before 1.16.5	1.14.18, 1.15.12, 1.16.5	Patch available	CNA
—	github.com/cilium/cilium (Go)	1.14.0 to before 1.14.19	1.14.19	Patch available	GHSA-h78m-j95m-5356
—	github.com/cilium/cilium (Go)	1.15.0 to before 1.15.13	1.15.13	Patch available	GHSA-h78m-j95m-5356
—	github.com/cilium/cilium (Go)	1.16.0 to before 1.16.6	1.16.6	Patch available	GHSA-h78m-j95m-5356

cilium Vendorcilium Affected 1.14.0 to before 1.14.18; 1.15.0 to before 1.15.12; 1.16.0 to before 1.16.5 Fixed in 1.14.18, 1.15.12, 1.16.5 Patch available CNA
github.com/cilium/cilium (Go) Vendor— Affected 1.14.0 to before 1.14.19 Fixed in 1.14.19 Patch available GHSA-h78m-j95m-5356
github.com/cilium/cilium (Go) Vendor— Affected 1.15.0 to before 1.15.13 Fixed in 1.15.13 Patch available GHSA-h78m-j95m-5356
github.com/cilium/cilium (Go) Vendor— Affected 1.16.0 to before 1.16.6 Fixed in 1.16.6 Patch available GHSA-h78m-j95m-5356

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:cilium:cilium::::::::	1.14.0 to before 1.14.19; 1.15.0 to before 1.15.13; 1.16.0 to before 1.16.6	Vulnerable	cilium

cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:* Versions 1.14.0 to before 1.14.19; 1.15.0 to before 1.15.13; 1.16.0 to before 1.16.6 Vulnerable ·cilium

Remediation

Fix · CNA cilium (cilium) Fixed in 1.14.18, 1.15.12, 1.16.5
Fix · GHSA-h78m-j95m-5356 github.com/cilium/cilium (Go) Fixed in 1.14.19 Advisory →
Fix · GHSA-h78m-j95m-5356 github.com/cilium/cilium (Go) Fixed in 1.15.13 Advisory →
Fix · GHSA-h78m-j95m-5356 github.com/cilium/cilium (Go) Fixed in 1.16.6 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2025-23047
2026-10-03 Alias added: GHSA-h78m-j95m-5356

References

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2025-23047

Other 1

https://github.com/cilium/cilium

TI-2024-32092 CIDR deny policies may not take effect when a more narrow CIDR allow is present CVSS 3.1HIGH 8.7
TI-2023-12305 Cilium eBPF filters may be temporarily removed during agent restart CVSS 3.1CRITICAL 9.8
TI-2023-20486 Cilium NetworkPolicy bypass via pod labels CVSS 3.1CRITICAL 9.0
TI-2022-11721 Incorrect Default Permissions in Cilium CVSS 3.1HIGH 8.8
TI-2026-36600 Cilium: Sensitive information disclosure and cluster disruption via local Envoy admin socket access CVSS 3.1CRITICAL 9.2
TI-2026-40915 Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces CVSS 3.1HIGH 8.9

See all 34 →

Sources

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