Cilium up to 1.17.15/1.18.9/1.19.3 CiliumLocalRedirectPolicy addressMatcher redirect

Summaryinfo

A vulnerability has been found in Cilium up to 1.17.15/1.18.9/1.19.3 and classified as problematic. The affected element is an unknown function of the component CiliumLocalRedirectPolicy. Performing a manipulation of the argument addressMatcher results in redirect. This vulnerability is identified as CVE-2026-53935. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Cilium up to 1.17.15/1.18.9/1.19.3. It has been classified as problematic. This affects an unknown part of the component CiliumLocalRedirectPolicy. The manipulation of the argument addressMatcher with an unknown input leads to a redirect vulnerability. CWE is classifying the issue as CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. This is going to have an impact on integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-53935 since 06/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1204.001 for this issue.

Upgrading to version 1.17.16, 1.18.10 or 1.19.4 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• Cilium

Version

• 1.17.0
• 1.17.1
• 1.17.2
• 1.17.3
• 1.17.4
• 1.17.5
• 1.17.6
• 1.17.7
• 1.17.8
• 1.17.9
• 1.17.10
• 1.17.11
• 1.17.12
• 1.17.13
• 1.17.14
• 1.17.15
• 1.18.0
• 1.18.1
• 1.18.2
• 1.18.3
• 1.18.4
• 1.18.5
• 1.18.6
• 1.18.7
• 1.18.8
• 1.18.9
• 1.19.0
• 1.19.1
• 1.19.2
• 1.19.3

Website

• Product: https://github.com/cilium/cilium/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion