CVE-2026-47775

{"id": "CVE-2026-47775", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-47775", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-06-29T15:05:22.645121Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 1.6}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "envoyproxy", "product": "envoy", "versions": [{"status": "affected", "version": ">= 1.38.0, < 1.38.1"}, {"status": "affected", "version": ">= 1.37.0, < 1.37.3"}, {"status": "affected", "version": ">= 1.36.0, < 1.36.7"}, {"status": "affected", "version": "< 1.35.11"}]}]}], "published": "2026-06-26T18:16:59.350", "references": [{"url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7p", "tags": ["Exploit", "Vendor Advisory", "Mitigation"], "source": "security-advisories@github.com"}, {"url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7p", "tags": ["Exploit", "Vendor Advisory", "Mitigation"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-209"}, {"lang": "en", "value": "CWE-327"}]}], "descriptions": [{"lang": "en", "value": "Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, the OAuth2 HTTP filter's encrypt()/decrypt() functions use AES-256-CBC without an authentication tag (no HMAC, no AEAD). The /callback endpoint returns HTTP 302 on successful decryption and HTTP 401 on padding failure, creating a padding oracle. An attacker who obtains the encrypted CodeVerifier cookie can recover the plaintext PKCE code_verifier in ~6,200 requests (~100 seconds), then exchange it with a stolen authorization code to obtain the victim's access token. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1."}, {"lang": "es", "value": "Envoy es un proxy de borde y de servicio de c\u00f3digo abierto dise\u00f1ado para aplicaciones nativas de la nube. Antes de 1.35.11, 1.36.7, 1.37.3 y 1.38.1, las funciones encrypt()/decrypt() del filtro HTTP de OAuth2 utilizan AES-256-CBC sin una etiqueta de autenticaci\u00f3n (sin HMAC, sin AEAD). El endpoint /callback devuelve HTTP 302 en caso de descifrado exitoso y HTTP 401 en caso de fallo de relleno, creando un or\u00e1culo de relleno. Un atacante que obtiene la cookie CodeVerifier cifrada puede recuperar el code_verifier PKCE en texto plano en ~6.200 solicitudes (~100 segundos), luego intercambiarlo con un c\u00f3digo de autorizaci\u00f3n robado para obtener el token de acceso de la v\u00edctima. Esta vulnerabilidad est\u00e1 corregida en 1.35.11, 1.36.7, 1.37.3 y 1.38.1."}], "lastModified": "2026-10-25T17:10:00.197", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D0D8A448-3D11-4236-A3E1-BEF6537F7B78", "versionEndExcluding": "1.35.11", "versionStartIncluding": "1.35.0"}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C0A19272-7178-4FCE-A4D3-5E578A871D4D", "versionEndExcluding": "1.36.7", "versionStartIncluding": "1.36.0"}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "24F12FF2-A40F-4C2C-B9C4-F59A22B99843", "versionEndExcluding": "1.37.3", "versionStartIncluding": "1.37.0"}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "54B4E89D-3622-4F96-A599-E85109E8D4DD", "versionEndExcluding": "1.38.1", "versionStartIncluding": "1.38.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}