---
cve: "CVE-2026-17552"
severity: "CRITICAL"
cvss: 9.1
epss: "35%"
vendor: "RRWO"
kev: false
exploited: false
published: "2026-07-27 18:16:54"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T13:06:01+02:00"
---

# CVE-2026-17552

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

Plack::App::Prerender versions before 0.3.0 for Perl can proxy to an arbitrary host via unvalidated REQUEST_URI concatenation in call.

When the rewrite base is a plain string, the REQUEST_URI is appended to it, with no check that the path starts with a forward slash ('/').

When the rewrite base does not contain a path (which is the standard given in the SYNOPSIS), an attacker can create a request that changes the hostname. A request target starting with an at-sign ('@') changes the base to a RFC 3986 userinfo component.

For example, a rewrite base of "https://example.com" with the submitted request "GET @192.168.1.2/" will send a request to "https://example.com@192.168.1.2/", with the rendered content returned to the attacker.

This allows an attacker to access internal or restricted hosts that only the webserver has access to.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- b051c0c43fb34fd298fd3c2a0f398a0f60a1bde0 (Commit)
- 2d793dd69e2b6f4e469618ee742bd8402677202d (Commit)

## Referenzen

- <https://github.com/robrwo/perl-Plack-App-Prerender/security/advisories/GHSA-6x4w-x68j-ppqq>
- <https://metacpan.org/release/RRWO/Plack-App-Prerender-v0.3.0/changes>
- <https://github.com/robrwo/perl-Plack-App-Prerender/commit/2d793dd69e2b6f4e469618ee742bd8402677202d.patch>
- <http://www.openwall.com/lists/oss-security/2026/07/28/3>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-17552) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_