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NVD 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.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
CVE-2026-47775 Padding Oracle in Envoy OAuth2 HTTP Filter Encryption Below 1.38.1 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-47775
Post summary
The text announces a padding‑oracle flaw in Envoy’s OAuth2 HTTP filter encryption affecting versions prior to 1.38.1, providing basic technical details but no PoC, exploit, or mitigation information.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | envoyproxy | envoy | - | - | - |