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CVE-2026-77281

Caddy: rewrite placeholder re-expansion PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
caddyserver / caddyaffected < 2.11.4

CWE

CWE-94, CWE-178, CWE-770

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.