Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-56742— Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces

Quick assessment

Affected
cilium cilium
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cilium是Cilium组织开源的一个开源软件。用于提供和透明地保护应用程序工作负载(如应用程序容器或进程)之间的网络连接和负载平衡。 Cilium存在授权问题漏洞，该漏洞源于使用Gateway API时，允许用户通过创建或更新命名空间HTTPRoutes将HTTP流量镜像到任何命名空间的任何Service，从而绕过ReferenceGrant授权机制。以下版本受到影响：1.17.17之前版本、1.18.11之前版本和1.19.5之前版本。

CVSS 5.9 · Medium EPSS 0.17% · P7

Possible ATT&CK Techniques 1 AI

T1115 · Clipboard Data

Affected Version Matrix 3

VendorProduct Version RangeStatus
cilium cilium < 1.17.17 affected
>= 1.18.0, < 1.18.11 affected
>= 1.19.0, < 1.19.5 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-56742

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Cilium 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cilium是Cilium组织开源的一个开源软件。用于提供和透明地保护应用程序工作负载(如应用程序容器或进程)之间的网络连接和负载平衡。 Cilium存在授权问题漏洞，该漏洞源于使用Gateway API时，允许用户通过创建或更新命名空间HTTPRoutes将HTTP流量镜像到任何命名空间的任何Service，从而绕过ReferenceGrant授权机制。以下版本受到影响：1.17.17之前版本、1.18.11之前版本和1.19.5之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cilium cilium < 1.17.17 -

II. Public POCs for CVE-2026-56742

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-56742

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-56742 (4)

Vendor Advisories for CVE-2026-56742 (1)

Vendor Pages for CVE-2026-56742 (3)

Same Patch Batch · cilium · 2026-07-15 · 3 CVEs total

CVE-2026-49445 9.2 CRITICAL Cilium: Sensitive information disclosure and cluster disruption via local Envoy admin sock
CVE-2026-56743 5.4 MEDIUM Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes N

IV. Related Vulnerabilities

Same product: cilium
Same vendor: cilium
Same weakness: CWE-862

V. Comments for CVE-2026-56742

No comments yet

Leave a comment