CPANSA-Plack-App-Prerender-2026-17552: Plack-App-Prerender vulnerability
| Publisher | giterlizzi | Document category | csaf_security_advisory |
|---|---|---|---|
| Initial release date | 2026-07-27T00:00:00 | Engine | CSAF Perl Toolkit 0.26 |
| Current release date | 2026-07-27T00:00:00 | Build Date | |
| Current version | 1 | Status | final |
| CVSS v3.1 Base Score | 9.1 | Severity | Critical |
| Original language | Language | en | |
| Also referred to | |||
Vulnerability 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.
Vulnerabilities
CVE-2026-17552
Vulnerability DescriptionPlack::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 (SSRF) |
|---|
Product status
Known affected
| Product | Score | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Plack-App-Prerender less than 0.3.0 |
|
Fixed
- Plack-App-Prerender greater than or equal 0.3.0
giterlizzi
Namespace: https://github.com/giterlizzi/
gdt@cpan.org
References
- CPANSA-Plack-App-Prerender-2026-17552 JSON self
https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-plack-app-prerender-2026-17552.json - https://github.com/robrwo/perl-Plack-App-Prerender/commit/2d793dd69e2b6f4e469618ee742bd8402677202d.patch external
https://github.com/robrwo/perl-Plack-App-Prerender/commit/2d793dd69e2b6f4e469618ee742bd8402677202d.patch - https://github.com/robrwo/perl-Plack-App-Prerender/security/advisories/GHSA-6x4w-x68j-ppqq external
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 external
https://metacpan.org/release/RRWO/Plack-App-Prerender-v0.3.0/changes - http://www.openwall.com/lists/oss-security/2026/07/28/3 external
http://www.openwall.com/lists/oss-security/2026/07/28/3 - CVE-2026-17552 (NVD) external
https://nvd.nist.gov/vuln/detail/CVE-2026-17552
Revision history
| Version | Date of the revision | Summary of the revision |
|---|---|---|
| 1 | Mon Jul 27 00:00:00 2026 | First release |
Sharing rules
TLP:WHITE
For the TLP version see: https://www.first.org/tlp/