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                            CERT-Renater

                Note d'Information No. 2026/VULN547
_____________________________________________________________________

DATE                : 27/05/2026

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running HTTP::Daemon for Perl version
                                   prior to 6.17.

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https://lists.security.metacpan.org/cve-announce/msg/40435207/
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========================================================================
CVE-2026-8450                                        CPAN Security Group
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        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.

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