CVE-2026-8450: HTTP::Daemon versions before 6.17 for Perl allow OS command injection via send_file(). send_file() opens its

This month

CRITICAL 9.1REMOTE

CVE-2026-8450 is a critical-severity flaw (CVSS 9.1) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-73, CWE-78
Published	2026-05-27
Last modified	2026-07-23

Publisher (CNA): CPANSec

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-05-27 05:16 UTCPublished CVE record published
2026-07-23 11:10 UTCUpdated Record last modified

Exact fixes by distribution

Fedora 46 · fzssh · FIXED · 1.4.0-2.fc46 · FEDORA-2026-8004fcd067 · source

sudo dnf upgrade --advisory=FEDORA-2026-8004fcd067

Ubuntu 20.04 · libhttp-daemon-perl · FIXED · 6.06-1ubuntu0.1+esm1

sudo apt update && sudo apt install --only-upgrade libhttp-daemon-perl dpkg --compare-versions "$(dpkg-query -W -f='${Version}' libhttp-daemon-perl)" ge "6.06-1ubuntu0.1+esm1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · libhttp-daemon-perl · FIXED · 6.13-1ubuntu0.2

sudo apt update && sudo apt install --only-upgrade libhttp-daemon-perl dpkg --compare-versions "$(dpkg-query -W -f='${Version}' libhttp-daemon-perl)" ge "6.13-1ubuntu0.2" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · libhttp-daemon-perl · FIXED · 6.16-1ubuntu0.24.04.1

sudo apt update && sudo apt install --only-upgrade libhttp-daemon-perl dpkg --compare-versions "$(dpkg-query -W -f='${Version}' libhttp-daemon-perl)" ge "6.16-1ubuntu0.24.04.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 25.10 · libhttp-daemon-perl · FIXED · 6.16-1ubuntu0.25.10.1

Debian 12 · libhttp-daemon-perl · FIXED · 6.16-1+deb13u1~deb12u1

sudo apt update && sudo apt install --only-upgrade libhttp-daemon-perl dpkg --compare-versions "$(dpkg-query -W -f='${Version}' libhttp-daemon-perl)" ge "6.16-1+deb13u1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · libhttp-daemon-perl · FIXED · 6.16-1+deb13u1

RHEL 10 · perl-HTTP-Daemon · FIXED · perl-HTTP-Daemon-6.16-7.el10_2.1

sudo dnf upgrade --advisory=RHSA-2026:36189 rpm -q perl-HTTP-Daemon

RHEL 8 · perl-HTTP-Daemon · FIXED · perl-HTTP-Daemon-6.01-24.el8_10

sudo dnf upgrade --advisory=RHSA-2026:36188 rpm -q perl-HTTP-Daemon

RHEL 9 · perl-HTTP-Daemon · FIXED · perl-HTTP-Daemon-6.12-6.el9_8.1

sudo dnf upgrade --advisory=RHSA-2026:36187 rpm -q perl-HTTP-Daemon

RHEL 7 · perl-HTTP-Daemon · NO FIX YET

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-1794 · source

sudo dnf update --advisory=ALAS2023-2026-1794

Amazon Linux 2 · see advisory · FIXED · ALAS2-2026-3341 · source

sudo yum update --advisory=ALAS2-2026-3341

Advisories and coverage

Official advisories

AlmaLinux Errata: [ALSA-2026:36187] Important: perl-HTTP-Daemon security update 2026-07-08

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-8450?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-8450 being exploited?

CVE-2026-8450 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-8450 affect?

CVE-2026-8450 affects affected software. Severity is critical (CVSS 9.1). 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 subproces

How urgent is CVE-2026-8450?

Priority 58/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

Perl vulnerabilities

References

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