CVE-2026-77281

Name	CVE-2026-77281
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
caddy (PTS)	bookworm	2.6.2-5	vulnerable
	trixie (security), trixie	2.6.2-12+deb13u1	vulnerable
	forky, sid	2.11.4-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
caddy	source	(unstable)	2.11.4-1

Notes

https://github.com/caddyserver/caddy/security/advisories/GHSA-j8px-rmrx-76h9
https://github.com/caddyserver/caddy/pull/7761
Fixed by: https://github.com/caddyserver/caddy/commit/176b043b0104cee3f894023cd5a598ac29e404bb (v2.11.4)