{"id":"CVE-2026-17552","aliases":["EUVD-2026-49394","GHSA-6x4w-x68j-ppqq"],"status":"published","title":"Plack::App::Prerender versions before 0.3.0 for Perl can proxy to an arbitrary host via unvalidated REQUEST_URI concatenation in call","description":"Plack::App::Prerender versions before 0.3.0 for Perl can proxy to an arbitrary host via unvalidated REQUEST_URI concatenation in call.\n\nWhen 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 ('/').\n\nWhen 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.\n\nFor 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.\n\nThis allows an attacker to access internal or restricted hosts that only the webserver has access to.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-09","score":0.00538,"percentile":0.45609,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-918"],"published":"2026-07-27T18:04:47Z","modified":"2026-10-28T02:30:57Z","products":[{"vendor":"rrwo","product":"plack::app::prerender"}],"references":[{"url":"https://github.com/robrwo/perl-Plack-App-Prerender/security/advisories/GHSA-6x4w-x68j-ppqq","tags":["vendor-advisory","advisory"]},{"url":"https://metacpan.org/release/RRWO/Plack-App-Prerender-v0.3.0/changes","tags":["release-notes","advisory"]},{"url":"https://github.com/robrwo/perl-Plack-App-Prerender/commit/2d793dd69e2b6f4e469618ee742bd8402677202d.patch","tags":["patch","fix"]},{"url":"http://www.openwall.com/lists/oss-security/2026/07/28/3","tags":["web"]},{"url":"https://cpan.org/modules","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/17xxx/CVE-2026-17552.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-17552","tags":["advisory"]},{"url":"https://github.com/robrwo/perl-Plack-App-Prerender","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-17552","title":"Plack::App::Prerender versions before 0.3.0 for Perl can proxy to an arbitrary host via unvalidated REQUEST_URI concatenation in call","description":"Plack::App::Prerender versions before 0.3.0 for Perl can proxy to an arbitrary host via unvalidated REQUEST_URI concatenation in call.\n\nWhen 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 ('/').\n\nWhen 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.\n\nFor 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.\n\nThis allows an attacker to access internal or restricted hosts that only the webserver has access to.","status":"published","published":"2026-07-27T18:04:47.993Z","modified":"2026-07-28T13:47:10.576Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"adp"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T14:19:54.84674Z"}],"euvd":[{"id":"EUVD-2026-49394","description":"Plack::App::Prerender versions before 0.3.0 for Perl can proxy to an arbitrary host via unvalidated REQUEST_URI concatenation in call.\n\nWhen 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 ('/').\n\nWhen 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.\n\nFor 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.\n\nThis allows an attacker to access internal or restricted hosts that only the webserver has access to.","status":"published","published":"2026-07-27T18:04:47Z","modified":"2026-07-28T13:47:10Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T18:02:31.827348Z"}],"nvd":[{"id":"CVE-2026-17552","description":"Plack::App::Prerender versions before 0.3.0 for Perl can proxy to an arbitrary host via unvalidated REQUEST_URI concatenation in call.\n\nWhen 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 ('/').\n\nWhen 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.\n\nFor 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.\n\nThis allows an attacker to access internal or restricted hosts that only the webserver has access to.","status":"published","published":"2026-07-27T18:16:54.15Z","modified":"2026-10-24T13:10:00.147Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"secondary"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T14:12:33.249634Z"}],"osv":[{"id":"CVE-2026-17552","title":"Plack::App::Prerender versions before 0.3.0 for Perl can proxy to an arbitrary host via unvalidated REQUEST_URI concatenation in call","description":"Plack::App::Prerender versions before 0.3.0 for Perl can proxy to an arbitrary host via unvalidated REQUEST_URI concatenation in call.\n\nWhen 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 ('/').\n\nWhen 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.\n\nFor 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.\n\nThis allows an attacker to access internal or restricted hosts that only the webserver has access to.","status":"published","published":"2026-07-27T18:04:47.993Z","modified":"2026-10-28T02:30:57.361579524Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T15:44:58.024074Z"}]}}