# CVE-2026-17552: Server-side request forgery in Plack::App::Prerender

> Attackers can force the application to proxy requests to arbitrary internal hosts, bypassing network restrictions and accessing sensitive data.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Jul 2026
- **Updated:** 28 Jul 2026
- **Also known as:** GHSA-6x4w-x68j-ppqq

## What is CVE-2026-17552?

CVE-2026-17552 is a critical server-side request forgery vulnerability in RRWO Plack::App::Prerender, published on 27 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-17552?


## How do I fix CVE-2026-17552?

No fix has been published for CVE-2026-17552 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-17552 being exploited?

There is no known exploitation of CVE-2026-17552 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-17552 and fix it if it is affected.

What it is: CVE-2026-17552 is a critical server-side request forgery vulnerability in RRWO Plack::App::Prerender, published on 27 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-17552 in the wild and no public exploit code.

Affected product: RRWO Plack::App::Prerender. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-17552/ (Markdown: https://insights.sbomify.com/CVE-2026-17552/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-17552
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-17552
- OSV: https://osv.dev/vulnerability/CVE-2026-17552

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-17552/
Summaries are generated and may contain mistakes; the official description above is the record.