Vulnerability-Lookup

CVE-2026-41246 (GCVE-0-2026-41246)

Vulnerability from cvelistv5 – Published: 2026-04-23 18:44 – Updated: 2026-06-30 12:08

Title

Contour: Lua code injection via Cookie Path Rewrite Policy

Summary

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.

Severity

8.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

GitHub_M

References

7 references

URL	Tags
https://github.com/projectcontour/contour/securit…	x_refsource_CONFIRM
https://github.com/projectcontour/contour/release…	x_refsource_MISC
https://github.com/projectcontour/contour/release…	x_refsource_MISC
https://github.com/projectcontour/contour/release…	x_refsource_MISC
https://access.redhat.com/security/cve/CVE-2026-41246	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2461257	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex

Impacted products

2 products

Vendor	Product	Version
projectcontour	contour	Affected: >= 1.33.0, < 1.33.4 Affected: >= 1.32.0, < 1.32.5 Affected: >= 1.19.0, < 1.31.6
Red Hat	ExternalDNS Operator	cpe:/a:redhat:ext_dns_optr:1

Show details on NVD website

JSON

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bit-contour-2026-41246

Vulnerability from bitnami_vulndb

Published

2026-04-25 08:36

Modified

2026-04-25 09:08

Summary

Contour: Lua code injection via Cookie Path Rewrite Policy

Details

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "contour",
        "purl": "pkg:bitnami/contour"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.19.0"
            },
            {
              "fixed": "1.31.6"
            },
            {
              "introduced": "1.32.0"
            },
            {
              "fixed": "1.32.5"
            },
            {
              "introduced": "1.33.0"
            },
            {
              "fixed": "1.33.4"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41246"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:projectcontour:contour:*:*:*:*:*:go:*:*"
    ],
    "severity": "High"
  },
  "details": "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\u0027s 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\u0027s 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\u0027s own route, which they already control. However, since Envoy runs as shared infrastructure, the injected code can also read Envoy\u0027s 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.",
  "id": "BIT-contour-2026-41246",
  "modified": "2026-04-25T09:08:48.036Z",
  "published": "2026-04-25T08:36:14.516Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/projectcontour/contour/releases/tag/v1.31.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/projectcontour/contour/releases/tag/v1.32.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/projectcontour/contour/releases/tag/v1.33.4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/projectcontour/contour/security/advisories/GHSA-x4mj-7f9g-29h4"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41246"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Contour: Lua code injection via Cookie Path Rewrite Policy"
}

FKIE_CVE-2026-41246

Vulnerability from fkie_nvd - Published: 2026-04-23 19:17 - Updated: 2026-06-30 03:19

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/projectcontour/contour/releases/tag/v1.31.6	Release Notes
security-advisories@github.com	https://github.com/projectcontour/contour/releases/tag/v1.32.5	Release Notes
security-advisories@github.com	https://github.com/projectcontour/contour/releases/tag/v1.33.4	Release Notes
security-advisories@github.com	https://github.com/projectcontour/contour/security/advisories/GHSA-x4mj-7f9g-29h4	Patch, Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-41246
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2461257
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41246.json

Impacted products

Vendor	Product	Version
projectcontour	contour	*
projectcontour	contour	*
projectcontour	contour	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "contour",
          "vendor": "projectcontour",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.33.0, \u003c 1.33.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.32.0, \u003c 1.32.5"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.19.0, \u003c 1.31.6"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:/a:redhat:ext_dns_optr:1"
          ],
          "defaultStatus": "unaffected",
          "product": "ExternalDNS Operator",
          "vendor": "Red Hat"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:projectcontour:contour:*:*:*:*:*:kubernetes:*:*",
              "matchCriteriaId": "F12B6476-CE93-4179-8E57-262B3B16BBF3",
              "versionEndExcluding": "1.31.6",
              "versionStartIncluding": "1.19.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:projectcontour:contour:*:*:*:*:*:kubernetes:*:*",
              "matchCriteriaId": "8617079B-4259-433B-B3BB-55AC5F8B2C8A",
              "versionEndExcluding": "1.32.5",
              "versionStartIncluding": "1.32.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:projectcontour:contour:*:*:*:*:*:kubernetes:*:*",
              "matchCriteriaId": "DBE830D3-D4B3-4DB4-A02D-F391F3007E33",
              "versionEndExcluding": "1.33.4",
              "versionStartIncluding": "1.33.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s 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\u0027s 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\u0027s own route, which they already control. However, since Envoy runs as shared infrastructure, the injected code can also read Envoy\u0027s 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."
    }
  ],
  "id": "CVE-2026-41246",
  "lastModified": "2026-06-30T03:19:25.287",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-41246",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-24T14:15:49.308320Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-23T19:17:29.670",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/projectcontour/contour/releases/tag/v1.31.6"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/projectcontour/contour/releases/tag/v1.32.5"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/projectcontour/contour/releases/tag/v1.33.4"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/projectcontour/contour/security/advisories/GHSA-x4mj-7f9g-29h4"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/security/cve/CVE-2026-41246"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461257"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41246.json"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
    }
  ]
}

GHSA-X4MJ-7F9G-29H4

Vulnerability from github – Published: 2026-04-24 15:19 – Updated: 2026-04-24 15:19

Summary

Contour has Lua code injection via Cookie Path Rewrite Policy

Details

Impact

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 the following fields that results in arbitrary code execution in the Envoy proxy:

spec.routes[].cookieRewritePolicies[].pathRewrite.value
spec.routes[].services[].cookieRewritePolicies[].pathRewrite.value

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, which could be used to read all Contour xDS configuration, including TLS certificates and private keys of other tenants.
Cause denial of service for other tenants sharing the Envoy instance.

Other use cases of Lua filter are not vulnerable.

Patches

The fix is available in Contour v1.33.4, v1.32.5, and v1.31.6.

v1.33.4: User-provided values are no longer interpolated into Lua code. Use of text/template is removed. Requires Envoy 1.35.0 or later.
v1.32.5, v1.31.6: User-provided values are escaped before interpolation into Lua code.

Workarounds

There are no workarounds. Users should upgrade to a patched version.

Severity

8.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/projectcontour/contour"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.19.0"
            },
            {
              "fixed": "1.31.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/projectcontour/contour"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.32.0"
            },
            {
              "fixed": "1.32.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/projectcontour/contour"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.33.0"
            },
            {
              "fixed": "1.33.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41246"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-24T15:19:49Z",
    "nvd_published_at": "2026-04-23T19:17:29Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nContour\u0027s [Cookie Rewriting](https://projectcontour.io/docs/1.33/config/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 the following fields that results in arbitrary code execution in the Envoy proxy:\n\n- `spec.routes[].cookieRewritePolicies[].pathRewrite.value`\n- `spec.routes[].services[].cookieRewritePolicies[].pathRewrite.value`\n\nThe cookie rewriting feature is internally implemented using Envoy\u0027s [HTTP Lua filter](https://www.envoyproxy.io/docs/envoy/latest/configuration/http/http_filters/lua_filter). User-controlled values are interpolated into Lua source code using Go `text/template` without sufficient sanitization.\n\nThe injected code only executes when processing traffic on the attacker\u0027s own route, which they already control. However, since Envoy runs as shared infrastructure, the injected code can also:\n\n- Read Envoy\u0027s xDS client credentials from the filesystem, which could be used to read all Contour xDS configuration, including TLS certificates and private keys of other tenants.\n- Cause denial of service for other tenants sharing the Envoy instance.\n\nOther use cases of Lua filter are not vulnerable.\n\n### Patches\n\nThe fix is available in Contour [v1.33.4](https://github.com/projectcontour/contour/releases/tag/v1.33.4), [v1.32.5](https://github.com/projectcontour/contour/releases/tag/v1.32.5), and [v1.31.6](https://github.com/projectcontour/contour/releases/tag/v1.31.6).\n\n- v1.33.4: User-provided values are no longer interpolated into Lua code. Use of `text/template` is removed. Requires Envoy 1.35.0 or later.\n- v1.32.5, v1.31.6: User-provided values are escaped before interpolation into Lua code.\n\n### Workarounds\n\nThere are no workarounds. Users should upgrade to a patched version.",
  "id": "GHSA-x4mj-7f9g-29h4",
  "modified": "2026-04-24T15:19:49Z",
  "published": "2026-04-24T15:19:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/projectcontour/contour/security/advisories/GHSA-x4mj-7f9g-29h4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41246"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/projectcontour/contour"
    },
    {
      "type": "WEB",
      "url": "https://github.com/projectcontour/contour/releases/tag/v1.31.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/projectcontour/contour/releases/tag/v1.32.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/projectcontour/contour/releases/tag/v1.33.4"
    },
    {
      "type": "WEB",
      "url": "https://projectcontour.io/docs/1.33/config/cookie-rewriting"
    },
    {
      "type": "WEB",
      "url": "https://www.envoyproxy.io/docs/envoy/latest/configuration/http/http_filters/lua_filter"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Contour has Lua code injection via Cookie Path Rewrite Policy"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-41246 (GCVE-0-2026-41246)

bit-contour-2026-41246

Vulnerability from bitnami_vulndb

FKIE_CVE-2026-41246

GHSA-X4MJ-7F9G-29H4

Impact

Patches

Workarounds

Tags

Sightings

Nomenclature