---
id: CVE-2026-78191
title: >-
  WebDyne versions from 2.031 before 3.022 for Perl execute files with .psp
  anywhere in the name as Perl pages
summary: >-
  WebDyne versions from 2.031 before 3.022 for Perl execute files with .psp
  anywhere in the name as Perl pages.


  WebDyne decides whether to run a requested file as a page by matching its name
  against WEBDYNE_PSP_EXT_RE, which has no end an…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: adp
cwe:
  - CWE-777
product: WebDyne
affected:
  - WebDyne >= 2.031 < 3.022
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-11-06T14:36:36.075558Z'
published: '2026-10-31'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T14:37:02.412Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-78191'
references:
  - url: 'https://metacpan.org/release/ASPEER/WebDyne-3.022/changes'
tags:
  - cve.org
epss: 0.00454
epssPercentile: 0.39592
ingestedAt: '2026-11-05T16:24:31.549Z'
---

## Overview

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

WebDyne decides whether to run a requested file as a page by matching its name against WEBDYNE_PSP_EXT_RE, which has no end anchor.

An application that accepts uploads by checking only the final extension lets a remote attacker upload a file such as report.psp.pdf and run its embedded Perl by requesting it.

## Affected

- `WebDyne >= 2.031 < 3.022`

## Remediation

Upgrade to WebDyne 3.022 or later.