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://[email protected]/", 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 Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/robrwo/perl-Plack-App-Prerender/commit/2d793dd69e2b6f4e469618
- https://github.com/robrwo/perl-Plack-App-Prerender/security/advisories/GHSA-6x4w
- https://metacpan.org/release/RRWO/Plack-App-Prerender-v0.3.0/changes
- http://www.openwall.com/lists/oss-security/2026/07/28/3
FAQ
What is CVE-2026-17552?
CVE-2026-17552 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 appe...
How severe is CVE-2026-17552?
CVE-2026-17552 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-17552?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.