CVE-2026-8450
CRITICALEPSS 71th pctlDescription
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.
How to fix
This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.
This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.
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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Exploit Intelligence
Elevated risk: more likely to be exploited than 71% of all known CVEs.
References
Related Vulnerabilities
Other CWE-73 (External Control of File Name or Path) vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-39952 | Critical | 9.8 | 100% | - | Fix |
| CVE-2024-8517 | Critical | 9.8 | 95% | - | Fix |
| CVE-2025-33053 | High | 8.8 | 88% | KEV | Fix |
| CVE-2023-4634 | Critical | 9.8 | 86% | - | Fix |
| CVE-2024-43451 | Medium | 6.5 | 84% | KEV | Fix |
| CVE-2018-17246 | Critical | 9.8 | 82% | - | Fix |
Common questions
How do I fix CVE-2026-8450?
Published advisories record a fix for 6 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2026-8450 being actively exploited?
Not that we know of. CVE-2026-8450 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.4% is the estimated probability that it will be exploited in the next 30 days. That is higher than 71% of all scored CVEs.
How severe is CVE-2026-8450?
CVE-2026-8450 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-8450 affect?
Published advisories record a fix for perl-HTTP-Daemon (Amazon), perl-HTTP-Daemon-tests (Amazon), libhttp-daemon-perl (Debian), perl-HTTP-Daemon (Red Hat / RHEL), and 2 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-23.