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No exploitation reported

CVE-2026-78191

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

No exploitation reported by the sources we read.

  • Published2026-10-31
  • WeaknessCWE-777

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-10-3114:34CVE publishedCNA

Versions per branch

Products declared by the CNA

As CPANSec, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-10-31

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-78191 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-10-31
Last Modified
2026-11-06
NVD status
Deferred
GitHub Advisory
GHSA-xv5f-qcmp-v8w2

Frequently asked questions

What is CVE-2026-78191?

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.

Is CVE-2026-78191 actively exploited?

Active exploitation of CVE-2026-78191 has not been confirmed. Its EPSS score was 0.5% on 2026-11-05, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-78191?

CVE-2026-78191 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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