CVE-2026-47775
Envoy OAuth2 Filter: Padding Oracle via AES-256-CBC Cookie Decryption
MEDIUM 6.8
En bref
- Source
- NVD
- EPSS
- EPSS 0.22 % · centile 12 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- GitHub_M
- Statut NVD
- Analyzed
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.
Faiblesses (CWE)
- CWE-209 — Message d'erreur contenant des informations sensibles
- CWE-327 — Utilisation d'un algorithme cryptographique cassé ou risqué
Références
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N | GitHub_M |
| CVSS 3.1 | MEDIUM 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N | NVD · security-advisories@github.com (Secondary) |
Références européennes
- ENISA EUVD · EUVD-2026-39817
- GCVE · GCVE-0-2026-47775
Configurations affectées (CPE NVD)
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*≥ 1.35.0 < 1.35.11cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*≥ 1.36.0 < 1.36.7cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*≥ 1.37.0 < 1.37.3cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*≥ 1.38.0 < 1.38.1
Produits affectés
| Produit | Versions |
|---|---|
| envoyproxy · envoy | affected >= 1.38.0, < 1.38.1 ; affected >= 1.37.0, < 1.37.3 ; affected >= 1.36.0, < 1.36.7 ; affected < 1.35.11 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |