CPANSA-WebDyne-2026-78189: WebDyne vulnerability
| Publisher | giterlizzi | Document category | csaf_security_advisory |
|---|---|---|---|
| Initial release date | 2026-10-31T00:00:00 | Engine | CSAF Perl Toolkit 0.26 |
| Current release date | 2026-10-31T00:00:00 | Build Date | |
| Current version | 1 | Status | final |
| CVSS v3.1 Base Score | Severity | ||
| Original language | Language | en | |
| Also referred to | |||
Vulnerability Description
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.
Vulnerabilities
CVE-2026-78189
Vulnerability DescriptionWebDyne 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.
| Weakness | CWE-22 : Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') |
|---|
Product status
Known affected
| Product | Score | ||||
|---|---|---|---|---|---|
| WebDyne greater than or equal 3.007 and less than 3.022 |
|
Fixed
- WebDyne greater than or equal 3.022
giterlizzi
Namespace: https://github.com/giterlizzi/
gdt@cpan.org
References
- CPANSA-WebDyne-2026-78189 JSON self
https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-webdyne-2026-78189.json - https://metacpan.org/release/ASPEER/WebDyne-3.022/changes external
https://metacpan.org/release/ASPEER/WebDyne-3.022/changes - CVE-2026-78189 (NVD) external
https://nvd.nist.gov/vuln/detail/CVE-2026-78189
Revision history
| Version | Date of the revision | Summary of the revision |
|---|---|---|
| 1 | Sat Oct 31 00:00:00 2026 | First release |
Sharing rules
TLP:WHITE
For the TLP version see: https://www.first.org/tlp/