BIT-envoy-2026-47778
See a problem?- Import Source
- https://github.com/bitnami/vulndb/tree/main/data/envoy/BIT-envoy-2026-47778.json
- JSON Data
- https://api.osv.dev/v1/vulns/BIT-envoy-2026-47778
- Aliases
-
- CVE-2026-47778
- GHSA-f8x4-rw5x-f3r7
- Published
- 2026-06-30T23:39:30Z
- Modified
- 2026-09-08T08:47:31Z
- Summary
- Envoy: Embedded NUL in TLS DNS SAN Truncation in the Default TLS Certificate Validator. (Auth Bypass)
- 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, a structural flaw was identified in DefaultCertValidator::verifySubjectAltName where the extracted DNS SAN string is cast to a C-style string using .c_str() before being passed to the Utility::dnsNameMatch() algorithm. If the attacker serves a certificate with a dNSName SAN containing an embedded NUL byte, the helper Utility::generalNameAsString captures the complete string including the NUL. However, when .c_str() evaluates it, implicit conversion to absl::string_view inside dnsNameMatch relies on strlen(), prematurely truncating the evaluation context. Envoy evaluates trucated string against the exact required config_san match and returns true, thereby successfully validating the string with the Nul byte for an upstream routing. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1.
- Database specific
{ "cpes": [ "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*" ], "severity": "Medium" }- References
Affected packages
Bitnami / envoy
Package
- Name
- envoy
- Purl
- pkg:bitnami/envoy
Severity
- 4.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N CVSS Calculator