{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-41246", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-18T03:47:03.135Z", "datePublished": "2026-04-23T18:44:39.907Z", "dateUpdated": "2026-04-24T18:20:40.823Z"}, "containers": {"cna": {"title": "Contour: Lua code injection via Cookie Path Rewrite Policy", "problemTypes": [{"descriptions": [{"cweId": "CWE-94", "lang": "en", "description": "CWE-94: Improper Control of Generation of Code ('Code Injection')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"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"}}], "references": [{"name": "https://github.com/projectcontour/contour/security/advisories/GHSA-x4mj-7f9g-29h4", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/projectcontour/contour/security/advisories/GHSA-x4mj-7f9g-29h4"}, {"name": "https://github.com/projectcontour/contour/releases/tag/v1.31.6", "tags": ["x_refsource_MISC"], "url": "https://github.com/projectcontour/contour/releases/tag/v1.31.6"}, {"name": "https://github.com/projectcontour/contour/releases/tag/v1.32.5", "tags": ["x_refsource_MISC"], "url": "https://github.com/projectcontour/contour/releases/tag/v1.32.5"}, {"name": "https://github.com/projectcontour/contour/releases/tag/v1.33.4", "tags": ["x_refsource_MISC"], "url": "https://github.com/projectcontour/contour/releases/tag/v1.33.4"}], "affected": [{"vendor": "projectcontour", "product": "contour", "versions": [{"version": ">= 1.33.0, < 1.33.4", "status": "affected"}, {"version": ">= 1.32.0, < 1.32.5", "status": "affected"}, {"version": ">= 1.19.0, < 1.31.6", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-23T18:44:39.907Z"}, "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'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."}], "source": {"advisory": "GHSA-x4mj-7f9g-29h4", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-24T14:15:49.308320Z", "id": "CVE-2026-41246", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-24T18:20:40.823Z"}}]}}

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{"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'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."}], "id": "CVE-2026-41246", "lastModified": "2026-04-28T19:04:03.063", "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"}]}, "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"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-94"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "Contour: Envoy: github.com/projectcontour/contour: Contour: Arbitrary Code Execution and Denial of Service via Lua Code Injection", "id": "2461257", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461257"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-94", "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'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.", "A flaw was found in Contour, a Kubernetes ingress controller. An attacker with Role-Based Access Control (RBAC) permissions to manage HTTPProxy resources can exploit a Lua code injection vulnerability within Contour's Cookie Rewriting feature. By crafting a malicious value in specific configuration fields, the attacker can achieve arbitrary code execution in the Envoy proxy. This could allow them to read sensitive credentials from the filesystem or cause a denial of service for other users sharing the Envoy instance."], "name": "CVE-2026-41246", "package_state": [{"cpe": "cpe:/a:redhat:ext_dns_optr:1", "fix_state": "Affected", "package_name": "edo/external-dns-rhel8", "product_name": "ExternalDNS Operator"}, {"cpe": "cpe:/a:redhat:ext_dns_optr:1", "fix_state": "Affected", "package_name": "edo/external-dns-rhel9", "product_name": "ExternalDNS Operator"}], "public_date": "2026-04-23T18:44:39Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-41246\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-41246\nhttps://github.com/projectcontour/contour/releases/tag/v1.31.6\nhttps://github.com/projectcontour/contour/releases/tag/v1.32.5\nhttps://github.com/projectcontour/contour/releases/tag/v1.33.4\nhttps://github.com/projectcontour/contour/security/advisories/GHSA-x4mj-7f9g-29h4"], "statement": "This is an Important vulnerability in Contour's Cookie Rewriting feature, allowing arbitrary code execution and denial of service. An attacker with Role-Based Access Control (RBAC) permissions to create or modify HTTPProxy resources can inject malicious Lua code into the Envoy proxy. This could lead to unauthorized access to sensitive credentials or disrupt services for other tenants sharing the Envoy instance.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.33.0,1.33.4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.32.0,1.32.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.19.0,1.31.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "contour", "source": "cna", "vendor": "projectcontour"}, "product": "contour", "vendor": "projectcontour"}], "analysis": {"en": {"generated_at": "2026-04-28T07:31:59.755594+00:00", "value": {"mitigation_remediation": ["Upgrade Contour to v1.33.4, v1.32.5, or v1.31.6 or newer to remove the vulnerability.", "Limit RBAC permissions so that only trusted administrators can create or modify HTTPProxy resources; consider removing modify permissions from untrusted users.", "If upgrading immediately is infeasible, disable the Cookie Rewriting feature or enforce strict validation on the cookieRewritePolicies.pathRewrite.value field to prevent injection.", "Monitor Envoy logs for unexpected Lua script execution or credential access and audit HTTPProxy objects for recent changes."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "Versions of Contour from 1.19.0 up to but excluding 1.33.4, 1.32.5, and 1.31.6 are impacted. The bug is fixed in Contour releases 1.33.4, 1.32.5, and 1.31.6; any deployment using earlier releases should be evaluated for upgrade eligibility.", "description_and_impact": "The vulnerability resides in the Cookie Rewriting feature of Contour, a Kubernetes ingress controller that utilizes Envoy's HTTP Lua filter. When an attacker with permission to create or modify HTTPProxy resources crafts a malicious value in the cookieRewritePolicies.pathRewrite.value field, the value is interpolated into Lua code without proper sanitization. This enables arbitrary Lua code execution within the Envoy proxy, allowing the attacker to read Envoy's xDS client credentials or cause a denial of service. The injected code runs only when traffic is processed on the attacker\u2019s own route, but because Envoy operates as shared infrastructure, the malicious script can affect other tenants as well.", "risk_and_exploitability": "The CVSS score of 8.1 indicates high severity, while the EPSS score indicates very low probability of exploitation in the wild. The vulnerability is not listed in CISA's KEV catalog. Exploitation requires RBAC permissions to create or modify HTTPProxy resources, so an attacker must either have legitimate cluster privileges or compromise a user with those rights. Once the malicious route is defined, the injected Lua code is executed during traffic handling and can exfiltrate credentials or crash Envoy, potentially impacting multiple tenants that share the same Envoy instance."}}}}, "created": "2026-04-27T22:30:14.286656+00:00", "updated": "2026-04-28T07:45:26.024390+00:00", "vendors": ["projectcontour", "projectcontour$PRODUCT$contour"]}