Partial String Comparison in Caddy - CVE-2026-45692
Published: November 9, 2026
Vulnerability identifier: #VU163179
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-45692
CWE-ID: CWE-187
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote administrator with restricted permissions to read and modify configuration objects outside their authorized scope.
The vulnerability exists due to inconsistent path interpretation in Caddy's /config API, where authorization uses textual prefixes but traversal interprets leading-zero array indices numerically. A remote administrator with restricted permissions can use a delegated client certificate on a configured remote admin endpoint to request a leading-zero index and access another array element using otherwise permitted read or write methods.
Affected software
Caddy
How to mitigate CVE-2026-45692
Install security update from vendor's website.
Caddy - update to 2.11.3