CVE-2026-78191 · agentprime

WebDyne versions from 2.031 before 3.022 for Perl execute files with .psp anywhere in the name as Perl pages

No CVSS scoreEPSS 0.0045 · 39th percentile

Published by the CVE Program (CNA: CPANSec) at 31 Oct 2026, 14:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Not given	Not given Package name: WebDyne https://cpan.org/modules pkg:cpan/WebDyne	affected 2.031 to before 3.022 custom Other versions: unaffected

Identifiers

CVE-2026-78191

CNA

CPANSec

Weakness (CWE)

CWE-777

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

WebDyne versions from 2.031 before 3.022 treat any file with ".psp" anywhere in its name as a Perl page and run it. An attacker who can upload files to an application that checks only the final extension, for example a file named report.psp.pdf, can then request that file to execute its embedded Perl code. Upgrade WebDyne to version 3.022 or later. The source does not list a workaround other than limiting uploads to files whose names are checked for the ".psp" extension at the end.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

No source has published a CVSS score for this record yet.

CISA KEV Not listed.
EPSS 0.0045, the 39th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:34 UTC Confirmed by the CVE List
31 Oct 2026, 14:39 UTC First seen by agentprime
31 Oct 2026, 15:16 UTC Confirmed by NVD

Sources

References from the CNA

metacpan.org/release/ASPEER/WebDyne-3.022/changes release-notes

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.