CVE-2026-45692: Caddy is an extensible server platform that uses TLS by default

Routine

MEDIUM 5.4UPGRADE

CVE-2026-45692 is a medium-severity flaw (CVSS 5.4) 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. From 2.4.0 until 2.11.3, the authorization layer and the /config traversal layer do not agree on what object the path refers to. In this case, a path authorized for one config object is accepted, but then resolves to a different config object during traversal. This happens because the authorization layer uses string prefix matching and the /config traversal layer parses array indice

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-187, CWE-863
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 18:17 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

caddyserver caddy UPGRADE

Affected: >= 2.4.0 and < 2.11.3

Fixed in: 2.11.3

Safe to downgrade to: a release before 2.4.0

1. Check installed version

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

2. UPGRADE to 2.11.3 (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.

3. If no update is available yet, DOWNGRADE to a release before 2.4.0 (Debian / Ubuntu)

apt-cache madison caddy sudo apt install caddy=<VERSION_BEFORE_2.4.0> sudo apt-mark hold caddy

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list caddy sudo dnf downgrade caddy-<VERSION_BEFORE_2.4.0> sudo dnf versionlock add caddy

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-45692?

caddy: upgrade to 2.11.3. Exact commands for each OS are on this page.

Is CVE-2026-45692 being exploited?

CVE-2026-45692 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-2026-45692 affect?

CVE-2026-45692 affects caddy. Severity is medium (CVSS 5.4). Caddy is an extensible server platform that uses TLS by default. From 2.4.0 until 2.11.3, the authorization layer and the /config traversal layer do not agree on what object the path refers to. In this case, a path authorized for one config

How urgent is CVE-2026-45692?

Priority 28/100. Public exploit reference

Software pages

Caddy vulnerabilities

Related CVEs

CVE-2026-45135 HIGH 8.1 UPGRADE Caddy is an extensible server platform that uses TLS by default
CVE-2026-52844 HIGH 7.5 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

References

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