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Advisory record · GHSA-2wmf-p7f8-w42h

EnvoyProxy Envoy Missing HTTP URL path normalization

CVSS 6.5 MediumEPSS 0.050 · 92nd percentile

Published by the GitHub Advisory Database at 24 May 2022, 16:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/envoyproxy/envoyGo<1.9.11.9.1
Identifiers
GHSA-2wmf-p7f8-w42h · CVE-2019-9901 · GHSA-xcx5-93pw-jw2w
Weakness (CWE)
CWE-706
Tags
Published
24 May 2022
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Envoy (github.com/envoyproxy/envoy) versions before 1.9.1 do not normalize HTTP URL paths. A remote attacker can send a path containing relative segments, such as one that resolves to an admin path, to get past an access control rule on that path, and a backend that interprets the path differently may then grant access beyond what the policy intended. Upgrade to Envoy 1.9.1 or later.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.5 Medium 3.0 CVSS:3.0/AC:H/AV:N/A:L/C:L/I:L/PR:N/S:C/UI:N CNA (mitre)
  • CISA KEV Not listed.
  • EPSS 0.050, the 92nd percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:45 UTC First seen by agentprime
  2. 31 Oct 2026, 14:45 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.