CVE-2026-8450Network attack vector

Command execution via two-argument open in send_file

Published May 27, 2026 · Updated May 27, 2026

OS command injection in HTTP::Daemon before 6.17 allows remote attackers to execute commands through crafted send_file() filenames. HTTP::Daemon::ClientConn::send_file() passes a string filename to Perl's two-argument open(), which treats pipe and redirection prefixes as executable or writable modes. Exploitation requires an application to pass attacker-influenced input to send_file(); commands run as the daemon UID, while alternate prefixes expose command output or create or truncate files.

CVSS severity9.1
Critical
EPSS probability1.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in HTTP::Daemon before 6.17 allows remote attackers to execute commands through crafted send_file() filenames. HTTP::Daemon::ClientConn::send_file() passes a string filename to Perl's two-argument open(), which treats pipe and redirection prefixes as executable or writable modes. Exploitation requires an application to pass attacker-influenced input to send_file(); commands run as the daemon UID, while alternate prefixes expose command output or create or truncate files.

The record

CVE
CVE-2026-8450
Published
May 27, 2026
Updated
May 27, 2026
Vendor
Olaf Alders
Product
HTTP::Daemon
Classifications
CWE-78, CWE-73, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Olaf Alders · HTTP::Daemonversion=0 <6.17

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-73External Control of File Name or Path
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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