CVE intelligence

CVE-2026-8450

Vulnerability intelligence

Published May 27, 2026Sources checked Nov 11, 2026

9.1CRITICALCVSS out of 10

What this means

Review the available evidence

CVE-2026-8450 and is rated Critical severity with a CVSS score of 9.1. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Jul 27, 2026

CBL-Mariner Releases

Vendor-listed releases

6.16-2

CISA KEVNot listedBased on the latest collected catalog

EPSS1.4%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-8450?

HTTP::Daemon versions before 6.17 for Perl allow OS command injection via send_file().

send_file() opens its string argument with Perl's 2-arg open(). The 2-arg form interprets magic prefixes: '| cmd' and 'cmd |' open a pipe to a subprocess, '> path' and '>> path' open the path for write or append.

Untrusted input passed to send_file() can run OS commands at the daemon process UID. The read-pipe form ('cmd |') also leaks subprocess stdout into the HTTP response body.

The write-mode forms can create or truncate files at attacker chosen paths.

Source: NVD