PT-2026-43494 · Cpan · Http::Daemon

Stig Palmquist + 1 · Published 2026-05-27 · Updated 2026-05-28 · CVE-2026-8450

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions HTTP::Daemon versions prior to 6.17

Description OS command injection is possible through the send file() function. This occurs because send file() utilizes Perl's 2-arg open() function, which interprets magic prefixes. Specifically, prefixes like '| cmd' and 'cmd |' open a pipe to a subprocess, while '> path' and '>> path' open a path for writing or appending. If untrusted input is passed to send file(), OS commands can be executed with the daemon process UID. Additionally, the read-pipe form ('cmd |') can leak subprocess stdout into the HTTP response body, and write-mode forms can create or truncate files at paths chosen by an attacker.

Recommendations Update to version 6.17 or later. As a temporary workaround, restrict or avoid passing untrusted input to the send file() function.

Fix

OS Command Injection

Weakness Enumeration

CWE-73

CWE-78

Related Identifiers

CVE-2026-8450

Affected Products

Http::Daemon

References · 8

• https://github.com/libwww-perl/HTTP-Daemon/commit/945d35141d94490f749640bd4390acd6a2193995.patch · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-8450 · Security Note
• https://github.com/libwww-perl/HTTP-Daemon/pull/89 · Note
• http://openwall.com/lists/oss-security/2026/05/27/5 · Note
• https://metacpan.org/release/OALDERS/HTTP-Daemon-6.17/changes · Note
• https://twitter.com/ADKCyber/status/2059785593689710883 · Twitter Post
• https://twitter.com/oss_security/status/2059926753590530326 · Twitter Post
• https://t.me/cveNotify/164798 · Telegram Post