Nixpkgs security tracker

Login with GitHub

Details of issue NIXPKGS-2026-0585

NIXPKGS-2026-0585
published 3 months, 1 week ago
Permalink CVE-2026-26308
7.5 HIGH
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): High (H)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Scope (S): Changed (C)
  • Confidentiality (C): High (H)
  • Integrity (I): Low (L)
  • Availability (A): None (N)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): High (H)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): High (H)
  • Modified Scope (MS): Changed (C)
  • Modified Integrity (MI): Low (L)
  • Modified Availability (MA): None (N)
updated 3 months, 1 week ago by @mweinelt Activity log
  • Created suggestion 3 months, 1 week ago
  • @mweinelt ignored
    11 packages
    • opa-envoy-plugin
    • python312Packages.envoy-utils
    • python313Packages.envoy-utils
    • python314Packages.envoy-utils
    • python312Packages.envoy-reader
    • python313Packages.envoy-reader
    • python314Packages.envoy-reader
    • python313Packages.envoy-data-plane
    • python314Packages.envoy-data-plane
    • home-assistant-component-tests.enphase_envoy
    • tests.home-assistant-component-tests.enphase_envoy
    3 months, 1 week ago
  • @mweinelt accepted 3 months, 1 week ago
  • @mweinelt published on GitHub 3 months, 1 week ago
Envoy has an RBAC Header Validation Bypass via Multi-Value Header Concatenation

Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, the Envoy RBAC (Role-Based Access Control) filter contains a logic vulnerability in how it validates HTTP headers when multiple values are present for the same header name. Instead of validating each header value individually, Envoy concatenates all values into a single comma-separated string. This behavior allows attackers to bypass RBAC policies—specifically "Deny" rules—by sending duplicate headers, effectively obscuring the malicious value from exact-match mechanisms. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.

Affected products

envoy
  • ==>= 1.37.0, < 1.37.1
  • ==< 1.34.13
  • ==>= 1.36.0, < 1.36.5
  • ==>= 1.35.0, < 1.35.9

Matching in nixpkgs

pkgs.envoy

Cloud-native edge and service proxy

Ignored packages (11)

Package maintainers

https://github.com/envoyproxy/envoy/security/advisories/GHSA-ghc4-35x6-crw5
https://github.com/envoyproxy/envoy/commit/b6ba0b2294b98484fb0ed8556897d1073cc27867