CVE-2026-77281: Caddy is an extensible server platform that uses TLS by default. In version 2.11.3 and earlier, three configuration-dependent weaknesses affect the handler and…

PriorityP340medium6.5CVSS 3.1

AVNACLPRNUINSUCLINAL

EPSS

0.36%

29.8th percentile

Caddy is an extensible server platform that uses TLS by default. In version 2.11.3 and earlier, three configuration-dependent weaknesses affect the handler and placeholder layer. In modules/caddyhttp/rewrite/rewrite.go, Rewrite.Rewrite() can pass attacker-controlled replacement bytes through buildQueryString for a second placeholder expansion when a rewrite URI ends with a literal question mark, allowing injected environment or request-variable placeholders to disclose data and, when the file provider is registered, allowing injected file placeholders to disclose readable files. The issue is fixed in version 2.11.4.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
caddyserver	caddy	< 2.11.4	2.11.4
github.com	caddyserver_caddy_v2	>= 0 < 2.11.4	2.11.4

CVSS provenance

nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

ghsa7.5HIGH

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