========================================================================
CVE-2026-8450                                        CPAN Security Group
========================================================================

        CVE ID:  CVE-2026-8450
  Distribution:  HTTP-Daemon
      Versions:  before 6.17

      MetaCPAN:  https://metacpan.org/dist/HTTP-Daemon
      VCS Repo:  https://github.com/libwww-perl/HTTP-Daemon

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

Description
-----------
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.

Problem types
-------------
- CWE-78 Improper Neutralization of Special Elements used in an OS
  Command ('OS Command Injection')
- CWE-73 External Control of File Name or Path

Solutions
---------
Upgrade to HTTP-Daemon 6.17 or later.

References
----------
https://github.com/libwww-perl/HTTP-Daemon/pull/89
https://github.com/libwww-perl/HTTP-Daemon/commit/945d35141d94490f749640bd4390acd6a2193995.patch
https://metacpan.org/release/OALDERS/HTTP-Daemon-6.17/changes

Timeline
--------
- 2026-05-12: Issue identified.
- 2026-05-19: HTTP-Daemon 6.17 released.