CVE-2026-41246Network attack vector

Authenticated Lua execution via unescaped path rewrite

Published Apr 23, 2026 · Updated Apr 23, 2026

Code injection in Project Contour Contour allows remote authenticated users to execute Lua code in the shared Envoy proxy. Cookie rewriting interpolates HTTPProxy pathRewrite.value input into HTTP Lua filter source through Go text/template without sufficient sanitization. The attacker needs RBAC permission to create or modify HTTPProxy resources and traffic to that route; execution can read xDS credentials or interrupt other tenants.

CVSS severity8.1
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Project Contour Contour allows remote authenticated users to execute Lua code in the shared Envoy proxy. Cookie rewriting interpolates HTTPProxy pathRewrite.value input into HTTP Lua filter source through Go text/template without sufficient sanitization. The attacker needs RBAC permission to create or modify HTTPProxy resources and traffic to that route; execution can read xDS credentials or interrupt other tenants.

The record

CVE
CVE-2026-41246
Published
Apr 23, 2026
Updated
Apr 23, 2026
Vendor
Project Contour
Product
Contour
Classifications
CWE-94, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.19.0, < 1.31.6
  2. Affected versionversion=>= 1.32.0, < 1.32.5
  3. Affected versionversion=>= 1.33.0, < 1.33.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Project Contour · Contourversion=>= 1.19.0, < 1.31.6; version=>= 1.32.0, < 1.32.5; version=>= 1.33.0, < 1.33.4

Published CVSS scores

8.1GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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