CVE-2026-47775
- Source
- https://cve.org/CVERecord?id=CVE-2026-47775
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47775.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-47775
- Aliases
-
- BIT-envoy-2026-47775
- GHSA-396h-jpq4-vc7p
- Downstream
- Related
- Published
- 2026-06-26T17:23:51.663Z
- Modified
- 2026-07-08T08:13:38.761737543Z
- Severity
-
- 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N CVSS Calculator
- Summary
- Envoy OAuth2 Filter: Padding Oracle via AES-256-CBC Cookie Decryption
- Details
-
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.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47775.json", "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-209", "CWE-327" ] }- References
Affected packages
Git / github.com/envoyproxy/envoy
Affected ranges
- Type
- GIT
- Repo
- https://github.com/envoyproxy/envoy
- Events
-
IntroducedFixedIntroducedFixedIntroducedFixedIntroducedFixed
- Database specific
{ "cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "source": "CPE_RANGE", "extracted_events": [ { "introduced": "1.35.0" }, { "fixed": "1.35.11" }, { "introduced": "1.36.0" }, { "fixed": "1.36.7" }, { "introduced": "1.37.0" }, { "fixed": "1.37.3" }, { "introduced": "1.38.0" }, { "fixed": "1.38.1" } ] }