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CVE-2026-46415— Caddy Defender trusted proxy client IP bypass

Quick assessment

Affected
JasonLovesDoggo caddy-defender
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

JasonLovesDoggo caddy-defender是JasonLovesDoggo个人开发者开源的一款嵌入式服务器防御软件。 JasonLovesDoggo caddy-defender 0.10.1之前版本存在安全漏洞，该漏洞源于在评估请求是否需要阻止时使用了 而非解析后的真实客户端IP，可能导致来自已阻止IP范围的客户端通过受信任代理绕过防御。

CVSS 8.2 · High EPSS 0.23% · P13

Affected Version Matrix 1

VendorProduct Version RangeStatus
JasonLovesDoggo caddy-defender < 0.10.1 affected
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I. Basic Information for CVE-2026-46415

Vulnerability Information
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Vulnerability Title
Caddy Defender trusted proxy client IP bypass
Source: CVE Program / CVE List V5
Vulnerability Description
The Caddy Defender plugin is a middleware for Caddy that allows users to block or manipulate requests based on the client's IP address. Prior to version 0.10.1, Caddy Defender used `r.RemoteAddr` when evaluating whether a request should be blocked. `RemoteAddr` is the address of the immediate peer connected to Caddy. In deployments where Caddy is behind a trusted proxy, CDN, or load balancer, the immediate peer is usually the proxy, not the original client. Caddy resolves the original client address into its `client_ip` request variable after applying the configured `trusted_proxies` policy, but Defender did not use that value. As a result, clients from blocked IP ranges could bypass Defender when accessing Caddy through a trusted proxy whose own IP address was not blocked. This affects deployments that use Defender behind trusted proxies and expect it to enforce blocking based on the real client IP. The issue is fixed in version 0.10.1 by making Defender prefer Caddys resolved `client_ip` request variable when it is available. Defender falls back to `RemoteAddr` only when Caddy has not provided a resolved client IP. There is no complete workaround in affected Defender versions for deployments that rely on Caddy's trusted proxy client IP resolution. Until upgrading, affected users should enforce equivalent IP blocking at the trusted proxy, CDN, load balancer, firewall, or other edge layer before traffic reaches Caddy. Deployments where Caddy receives traffic directly from clients, without an intermediate trusted proxy, are not affected by this bypass.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
JasonLovesDoggo caddy-defender 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JasonLovesDoggo caddy-defender是JasonLovesDoggo个人开发者开源的一款嵌入式服务器防御软件。 JasonLovesDoggo caddy-defender 0.10.1之前版本存在安全漏洞，该漏洞源于在评估请求是否需要阻止时使用了`r.RemoteAddr`而非解析后的真实客户端IP，可能导致来自已阻止IP范围的客户端通过受信任代理绕过防御。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
JasonLovesDoggo caddy-defender < 0.10.1 -

II. Public POCs for CVE-2026-46415

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III. Intelligence Information for CVE-2026-46415

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Patches & Fixes for CVE-2026-46415 (1)

Other References for CVE-2026-46415 (1)

IV. Related Vulnerabilities

Same vendor: JasonLovesDoggo
Same weakness: CWE-284

V. Comments for CVE-2026-46415

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