{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-47775", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-19T22:36:16.882Z", "datePublished": "2026-06-26T17:23:51.663Z", "dateUpdated": "2026-06-26T17:23:51.663Z"}, "containers": {"cna": {"title": "Envoy OAuth2 Filter: Padding Oracle via AES-256-CBC Cookie Decryption", "problemTypes": [{"descriptions": [{"cweId": "CWE-209", "lang": "en", "description": "CWE-209: Generation of Error Message Containing Sensitive Information", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-327", "lang": "en", "description": "CWE-327: Use of a Broken or Risky Cryptographic Algorithm", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7p", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7p"}], "affected": [{"vendor": "envoyproxy", "product": "envoy", "versions": [{"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", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-26T17:23:51.663Z"}, "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."}], "source": {"advisory": "GHSA-396h-jpq4-vc7p", "discovery": "UNKNOWN"}}}}

{}

{}

{}

{"created": "2026-06-26T19:30:04.660686+00:00", "updated": "2026-06-26T19:30:04.660692+00:00", "vendors": []}