CVE-2026-52844: Caddy is an extensible server platform that uses TLS by default

Q: How do I fix CVE-2026-52844?

caddy: upgrade to 2.11.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-52844 being exploited?

CVE-2026-52844 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-52844 affect?

CVE-2026-52844 affects caddy. Severity is high (CVSS 7.5). Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, on Windows, Caddy path matchers treat /private\secret.txt as outside /private/*, but file_server later resolves the same request path as private\secret.txt on

Q: How urgent is CVE-2026-52844?

Priority 49/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-52844 is a high-severity flaw (CVSS 7.5) affecting caddy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, on Windows, Caddy path matchers treat /private\secret.txt as outside /private/*, but file_server later resolves the same request path as private\secret.txt on disk. An unauthenticated remote client can bypass Caddy path-scoped auth/deny routes protecting /private/*. This vulnerability is fixed in 2.11.4.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-22, CWE-284
Published	2026-06-23
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: caddyserver

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-23 18:18 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

caddyserver caddy UPGRADE

Affected: < 2.11.4

Fixed in: 2.11.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy caddy || rpm -q caddy || caddy --version

2. UPGRADE to 2.11.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade caddy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade caddy

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-52844?

caddy: upgrade to 2.11.4. Exact commands for each OS are on this page.

Is CVE-2026-52844 being exploited?

CVE-2026-52844 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-52844 affect?

CVE-2026-52844 affects caddy. Severity is high (CVSS 7.5). Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, on Windows, Caddy path matchers treat /private\secret.txt as outside /private/*, but file_server later resolves the same request path as private\secret.txt on

How urgent is CVE-2026-52844?

Priority 49/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Windows vulnerabilities · Caddy vulnerabilities

Related CVEs

CVE-2026-45135 HIGH 8.1 UPGRADE Caddy is an extensible server platform that uses TLS by default
CVE-2026-52845 HIGH 8.1 UPGRADE Caddy is an extensible server platform that uses TLS by default
CVE-2026-45692 MEDIUM 5.4 UPGRADE Caddy is an extensible server platform that uses TLS by default

References

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