CVE-2026-27587CRITICAL 9.1EPSS p28.6%

CVE-2026-27587CVE-2026-27587

Description

Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP `path` request matcher is intended to be case-insensitive, but when the match pattern contains percent-escape sequences (`%xx`) it compares against the request's escaped path without lowercasing. An attacker can bypass path-based routing and any access controls attached to that route by changing the casing of the request path. Version 2.11.1 contains a fix for the issue.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.37% probability of exploitation · percentile 28.6% · 2026-06-19T12:03:05Z
Published2026-02-24
Last modified2026-02-25

Underlying weaknesses· 1

CWE-178

References

  1. https://github.com/caddyserver/caddy/releases/tag/v2.11.1
  2. https://github.com/caddyserver/caddy/security/advisories/GHSA-g7pc-pc7g-h8jh

1

TypeTargetConfidenceTier
WeaknessImproper Handling of Case Sensitivitycwe-1780%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.