CVE-2026-78189

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CVE-2026-78189

Summary: WebDyne versions from 3.007 before 3.022 for Perl execute .psp files outside the document root via path traversal in the PSGI API route fallback

Details: WebDyne versions from 3.007 before 3.022 for Perl execute .psp files outside the document root via path traversal in the PSGI API route fallback. When a request matches no file, the PSGI handler retries it as an API route through api_filename. That keeps .. segments in the request path and only checks that the joined path starts with the document root, which a request for /../private passes. A remote attacker can run the embedded Perl in any .psp file the server can read, such as one uploaded to a directory outside the document root.

References: https://cpan.org/modules, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78189.json, https://metacpan.org/release/ASPEER/WebDyne-3.022/changes, https://nvd.nist.gov/vuln/detail/CVE-2026-78189, https://github.com/aspeer/WebDyne