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Vulnerability · Published Feb 24, 2026 · Assigned by GitHub_M

CVE-2026-27585Caddy's improper sanitization of glob characters in file matcher may lead to bypassing security protections

Medium 6.9

In plain English

A medium-severity improper input validation in caddy from caddyserver. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium
Exploit odds (30 days)0.4%top 69.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the path sanitization routine in file matcher doesn't sanitize backslashes which can lead to bypassing path related security protections. It affects users with specific Caddy and environment configurations. Version 2.11.1 fixes the issue.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.23caddy2.11.2-r0ALPINE-CVE-2026-27585
Alpine:v3.24caddy2.11.1-r0ALPINE-CVE-2026-27585
Debian:12caddy2.6.2-5+deb12u1DEBIAN-CVE-2026-27585
Debian:13caddy2.6.2-12+deb13u1DEBIAN-CVE-2026-27585
Debian:14caddy2.11.2-1DEBIAN-CVE-2026-27585
Gogithub.com/caddyserver/caddy/v22.11.1GO-2026-4535
Gogithub.com/caddyserver/caddy/v22.11.1GHSA-4xrr-hq4w-6vf4
Ubuntu:25.10caddyno fix listedUBUNTU-CVE-2026-27585
Ubuntu:26.10caddyno fix listedUBUNTU-CVE-2026-27585

Affected products (as reported)

VendorProductVersions
caddyserver caddy < 2.11.1

Weakness: CWE-20 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

References