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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-41246 Detail

Description

Contour is a Kubernetes ingress controller using Envoy proxy. From v1.19.0 to before v1.33.4, v1.32.5, and v1.31.6, Contour's Cookie Rewriting feature is vulnerable to Lua code injection. An attacker with RBAC permissions to create or modify HTTPProxy resources can craft a malicious value in spec.routes[].cookieRewritePolicies[].pathRewrite.value or spec.routes[].services[].cookieRewritePolicies[].pathRewrite.value that results in arbitrary code execution in the Envoy proxy. The cookie rewriting feature is internally implemented using Envoy's HTTP Lua filter. User-controlled values are interpolated into Lua source code using Go text/template without sufficient sanitization. The injected code only executes when processing traffic on the attacker's own route, which they already control. However, since Envoy runs as shared infrastructure, the injected code can also read Envoy's xDS client credentials from the filesystem or cause denial of service for other tenants sharing the Envoy instance. This vulnerability is fixed in v1.33.4, v1.32.5, and v1.31.6.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://access.redhat.com/security/cve/CVE-2026-41246 redhat-SADP
https://bugzilla.redhat.com/show_bug.cgi?id=2461257 redhat-SADP
https://github.com/projectcontour/contour/releases/tag/v1.31.6 GitHub, Inc. Release Notes 
https://github.com/projectcontour/contour/releases/tag/v1.32.5 GitHub, Inc. Release Notes 
https://github.com/projectcontour/contour/releases/tag/v1.33.4 GitHub, Inc. Release Notes 
https://github.com/projectcontour/contour/security/advisories/GHSA-x4mj-7f9g-29h4 GitHub, Inc. Patch  Vendor Advisory 
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41246.json redhat-SADP

Weakness Enumeration

CWE-ID CWE Name Source
CWE-94 Improper Control of Generation of Code ('Code Injection') redhat-SADP   GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

6 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-41246
NVD Published Date:
04/23/2026
NVD Last Modified:
07/14/2026
Source:
GitHub, Inc.