---
id: CVE-2026-77281
title: Caddy is an extensible server platform that uses TLS by default
summary: >-
  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()…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'
cwe:
  - CWE-94
  - CWE-178
  - CWE-770
vendor: caddyserver
product: caddy
affected:
  - caddy < 2.11.4
patched:
  - github.com/caddyserver/caddy/v2 2.11.4
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T15:17:12.747'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77281'
references:
  - url: >-
      https://github.com/caddyserver/caddy/commit/176b043b0104cee3f894023cd5a598ac29e404bb
    label: security-advisories@github.com
  - url: 'https://github.com/caddyserver/caddy/pull/7761'
    label: security-advisories@github.com
  - url: 'https://github.com/caddyserver/caddy/releases/tag/v2.11.4'
    label: security-advisories@github.com
  - url: >-
      https://github.com/caddyserver/caddy/security/advisories/GHSA-j8px-rmrx-76h9
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77281'
  - url: 'https://github.com/advisories/GHSA-j8px-rmrx-76h9'
  - url: 'https://github.com/caddyserver/caddy'
tags:
  - nvd
  - cve.org
  - ghsa
  - go
  - osv
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-18T14:39:55.254322Z'
epss: 0.0036
epssPercentile: 0.29815
aliases:
  - GHSA-j8px-rmrx-76h9
  - CVE-2026-92284
  - CVE-2026-92700
ecosystem: go
ingestedAt: '2026-09-17T21:29:16.985Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-77281)

Affected packages:

- `github.com/caddyserver/caddy/v2 <= 2.11.3`

Patched in:

- `github.com/caddyserver/caddy/v2 2.11.4`

Source: https://github.com/advisories/GHSA-j8px-rmrx-76h9