CVE-2026-47775

描述

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.

如何修補 CVE-2026-47775

要修補 CVE-2026-47775,請將受影響套件升級到下列已修補版本。

• —升級至 1.35.11 或更新版本

CVE-2026-47775 正在被利用嗎?

低 — EPSS 為 0.2%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, < 1.35.11, >= 1.36.0, < 1.36.7, >= 1.37.0, < 1.37.3, >= 1.38.0, < 1.38.1

CVSS 分數

參考連結(2)

• WEBgithub.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7p
• WEBnvd.nist.gov/vuln/detail/CVE-2026-47775