CVE catalog
CVE-2026-47775
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-
- Severity
- Medium · CVSS 6.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.22% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | envoy | Not reported | 1.35.11 | fixed |
| Cpe | envoy | Not reported | 1.36.7 | fixed |
| Cpe | envoy | Not reported | 1.37.3 | fixed |
| Cpe | envoy | Not reported | 1.38.1 | fixed |
| Cpe | envoy | Not reported | 1.38.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | envoy | cpe | Not reported | 1.35.11 | Not reported | Not reported | Not reported |
| Cpe | envoy | cpe | Not reported | 1.36.7 | Not reported | Not reported | Not reported |
| Cpe | envoy | cpe | Not reported | 1.37.3 | Not reported | Not reported | Not reported |
| Cpe | envoy | cpe | Not reported | 1.38.1 | Not reported | Not reported | Not reported |
| Cpe | envoy | cpe | Not reported | 1.38.1 | Not reported | NVD-CVE-2026-47775 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11141-1.json]
- [https://github.com/envoyproxy/envoy/security/advisories/GHSA-396h-jpq4-vc7p]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-47775]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2048.json]
[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [SUSE security advisories and VEX]