{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "1.35.0"
              },
              {
                "fixed": "1.35.11"
              },
              {
                "introduced": "1.36.0"
              },
              {
                "fixed": "1.36.7"
              },
              {
                "introduced": "1.37.0"
              },
              {
                "fixed": "1.37.3"
              },
              {
                "introduced": "1.38.0"
              },
              {
                "fixed": "1.38.1"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "84305a6cb64bd55aaf606bdd53de7cd6080427a1"
            },
            {
              "fixed": "f2a676793ef8c5ea9d1df9e1e806826c8f1fd51e"
            },
            {
              "introduced": "63ee0dc79dce88117c6bd2df5a742f8eb67ea980"
            },
            {
              "fixed": "ab5b508735aac42f2855099285de9c79258e5166"
            },
            {
              "introduced": "6d9bb7d9a85d616b220d1f8fe67b61f82bbdb8d3"
            },
            {
              "fixed": "89fee998e13fd53a26df1c492bc0f9bf0fabc5be"
            },
            {
              "introduced": "f1dd21b16c244bda00edfb5ffce577e12d0d2ec2"
            },
            {
              "fixed": "5022e0b6cadc236414e98c74d611c9566ca398b8"
            }
          ],
          "repo": "https://github.com/envoyproxy/envoy",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-396h-jpq4-vc7p"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-209",
      "CWE-327"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47775.json"
  },
  "details": "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.",
  "id": "CVE-2026-47775",
  "modified": "2026-07-08T05:37:44.895081689Z",
  "published": "2026-06-26T17:23:51.663Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47775.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47775"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Envoy OAuth2 Filter: Padding Oracle via AES-256-CBC Cookie Decryption"
}