CyberRota Analysis
AI-GeneratedEnvoy's HTTP RBAC feature is vulnerable to a bypass attack that allows unauthorized requests to pass through due to improper handling of opaque header bytes, which can lead to a negative policy incorrectly allowing access. This flaw primarily affects versions prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, and organizations using Envoy for cloud-native applications should prioritize upgrading to mitigate the risk of unauthorized access.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy HTTP RBAC accepts RFC-valid opaque header bytes but evaluates safe_regex values with RE2's UTF-8 subject semantics. A downstream client can preserve a prohibited marker and add an unrelated obs-text octet, causing RE2::FullMatch to return false and a negative RBAC policy to treat the invalid subject as an ordinary no-match. A byte-oriented route matcher can still observe the marker, allowing the request to reach a route intended to be denied. The relevant scope boundary is that plain positive ALLOW regexes normally fail closed, and exact, prefix, suffix, and contains matchers are not shown to have this subject-domain failure. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.
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