CVE-2026-41113Public exploitNetwork attack vector

Unauthenticated command execution via DNS MX injection

Published Apr 16, 2026 · Updated Apr 16, 2026

OS command injection in Sagredo qmail before 2026.04.07 allows remote attackers to execute commands as qmailr through crafted DNS MX data. The tls_quit function in qmail-remote.c places the DNS-derived partner_fqdn inside a single-quoted touch command and passes it to popen without validation. Exploitation requires control/notlshosts_auto to be enabled, outbound mail to an attacker-controlled domain, and a deliberately failed TLS handshake.

CVSS severity8.1
High
EPSS probability0.85%
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 Sagredo qmail before 2026.04.07 allows remote attackers to execute commands as qmailr through crafted DNS MX data. The tls_quit function in qmail-remote.c places the DNS-derived partner_fqdn inside a single-quoted touch command and passes it to popen without validation. Exploitation requires control/notlshosts_auto to be enabled, outbound mail to an attacker-controlled domain, and a deliberately failed TLS handshake.

The record

CVE
CVE-2026-41113
Published
Apr 16, 2026
Updated
Apr 16, 2026
Vendor
Sagredo
Product
qmail
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 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=2024.10.26 <2026.04.07

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sagredo · qmailversion=2024.10.26 <2026.04.07

Published CVSS scores

8.1MITRECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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