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Advisory record · GHSA-x4mj-7f9g-29h4

Contour has Lua code injection via Cookie Path Rewrite Policy

CVSS 8.1 HighEPSS 0.0049 · 42nd percentile

Published by the GitHub Advisory Database at 24 Apr 2026, 15:19 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/projectcontour/contourGo>=1.19.0, <1.31.6 || >=1.32.0, <1.32.5 || >=1.33.0, <1.33.41.31.6, 1.32.5, 1.33.4
Identifiers
GHSA-x4mj-7f9g-29h4 · BIT-contour-2026-41246 · CVE-2026-41246 · GO-2026-5738
Weakness (CWE)
CWE-94
Tags
Published
24 Apr 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Contour versions from 1.19.0 before 1.31.6, from 1.32.0 before 1.32.5, and from 1.33.0 before 1.33.4 are vulnerable to Lua code injection through the cookie rewrite path value fields in HTTPProxy resources. An attacker who can create or modify HTTPProxy resources could run arbitrary code in the Envoy proxy, which could expose xDS credentials and other tenants' TLS keys or cause denial of service. Upgrade to Contour 1.31.6, 1.32.5, or 1.33.4; version 1.33.4 requires Envoy 1.35.0 or later. No workaround is listed.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.1 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0049, the 42nd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:13 UTC First seen by agentprime
  2. 31 Oct 2026, 14:13 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.