Description
An argument injection flaw was found in CUPS. When email notification is configured, the CUPS scheduler accepts printer subscription requests that supply a mailto notify-recipient-uri. The mailto notifier passes the recipient address to the configured sendmail program without ensuring it cannot be interpreted as command-line options. A remote attacker who can reach the CUPS service could supply a crafted recipient value starting with "-" to influence sendmail behavior. Successful exploitation depends on the installed mail transfer agent and CUPS network exposure, and may lead to execution of attacker-controlled commands with the privileges of the CUPS service user.
Published: 2026-10-05
Score: 2.5 Low
EPSS: < 1% Very Low
KEV: No
Impact: Remote Command Execution
Action: Apply patch
AI Analysis

Impact

An argument injection flaw in the CUPS mailto notifier allows a crafted recipient address to be passed to the configured sendmail program without filtering command‑line options, enabling an attacker to influence sendmail’s behavior. If successful, the attacker can execute arbitrary commands with the privileges of the CUPS service user. The CVSS score of 2.5 indicates a low overall severity, but the potential for remote code execution remains significant because it can occur over the network without local system access.

Affected Systems

The flaw affects CUPS installations on Red Hat Enterprise Linux 10, 8, 9, and Red Hat Hardened Images. These distributions ship CUPS as part of the OS packages and therefore are within the scope of the vulnerability.

Risk and Exploitability

The attack vector is likely remote via TCP port 631, the standard CUPS service port. Exploitation requires an exposed CUPS service and a mail transfer agent that accepts command‑line options from the recipient address. The EPSS is not available, and the vulnerability is not listed in the CISA KEV catalog, implying a relatively low likelihood of widespread exploitation at this time. Nonetheless, the potential to execute commands as the CUPS user warrants immediate mitigation.

Generated by OpenCVE AI on October 5, 2026 at 20:47 UTC.

Remediation

Vendor Workaround

Restrict network access to the CUPS service (port 631/tcp) to trusted hosts only, and avoid exposing cupsd to untrusted networks. If email notifications are not required, do not configure mailto subscriptions or remove/disable the mailto notifier. Ensure only a trusted mail transfer agent is installed and referenced from CUPS mailto configuration. Monitor for unexpected printer subscriptions and unusual sendmail activity from the lp user.


OpenCVE Recommended Actions

  • Update CUPS to the latest Red Hat security update that patches the argument injection flaw.
  • If email notifications are not required, disable or remove the mailto notifier; otherwise, configure it to use only a trusted sendmail program.
  • Restrict network access to the CUPS service (port 631/tcp) by firewalling or limiting inbound hosts to trusted networks.

Generated by OpenCVE AI on October 5, 2026 at 20:47 UTC.

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History

Fri, 09 Oct 2026 09:15:00 +0000

Type Values Removed Values Added
First Time appeared Cups
Cups cups
Redhat hardened Images
Vendors & Products Cups
Cups cups
Redhat hardened Images

Wed, 07 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
References

Tue, 06 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 06 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Low


Mon, 05 Oct 2026 19:00:00 +0000

Type Values Removed Values Added
Description An argument injection flaw was found in CUPS. When email notification is configured, the CUPS scheduler accepts printer subscription requests that supply a mailto notify-recipient-uri. The mailto notifier passes the recipient address to the configured sendmail program without ensuring it cannot be interpreted as command-line options. A remote attacker who can reach the CUPS service could supply a crafted recipient value starting with "-" to influence sendmail behavior. Successful exploitation depends on the installed mail transfer agent and CUPS network exposure, and may lead to execution of attacker-controlled commands with the privileges of the CUPS service user.
Title Cups: cups: argument injection in mailto notifier via notify-recipient-uri
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Weaknesses CWE-88
CPEs cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 2.5, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N'}


Subscriptions

Cups Cups
Redhat Enterprise Linux Hardened Images Hummingbird
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-07T17:20:06.153Z

Reserved: 2026-10-05T08:47:01.523Z

Link: CVE-2026-105326

cve-icon Vulnrichment

Updated: 2026-10-06T14:43:45.268Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-05T19:17:16.393

Modified: 2026-10-07T18:17:15.577

Link: CVE-2026-105326

cve-icon Redhat

Severity : Low

Publid Date: 2026-10-05T08:00:00Z

Links: CVE-2026-105326 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-09T08:45:23Z

Weaknesses
  • CWE-88

    Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')