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CVE-2026-47775

MEDIUM
6.8
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-47775
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-19 22:36 UTC
Published
2026-06-26 17:23 UTC
Last updated
2026-06-26 17:23 UTC
Primary CWE
CWE-209
CWE-209: Generation of Error Message Containing Sensitive In…
Vendor / Product
envoyproxy / envoy
Sources
cve.org  ·  NVD

Severity & Metrics

6.8 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Affected products (1)
VendorProductPlatformVersions
envoyproxy envoy — >= 1.38.0, < 1.38.1, >= 1.37.0, < 1.37.3, >= 1.36.0, < 1.36.7, < 1.35.11
Weakness (CWE)
CWESourceDescription
CWE-209 cna CWE-209: Generation of Error Message Containing Sensitive Information
CWE-327 cna CWE-327: Use of a Broken or Risky Cryptographic Algorithm
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.8 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
References (1)
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