CVE-2026-47775

Description

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.

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Produits concernés

• envoyproxy envoy

Scores CVSS

Faiblesses (CWE)

• CWE-209
• CWE-327

Références

• https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7p ExploitVendor AdvisoryMitigation
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7p ExploitVendor AdvisoryMitigation

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories