---
id: CVE-2026-105326
title: An argument injection flaw was found in CUPS
summary: >-
  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 …
severity: low
cvss: 2.5
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-88
vendor: Red Hat
product: cups
affected:
  - cups (all versions)
  - cups (all versions)
  - cups (all versions)
  - rhel9/cups (all versions)
  - cups (all versions)
published: '2026-10-05'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T19:17:16.393'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-105326'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-105326'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2545835'
    label: secalert@redhat.com
  - url: 'https://github.com/OpenPrinting/cups/commit/1244ed9'
    label: secalert@redhat.com
  - url: 'https://github.com/OpenPrinting/cups/commit/611d1bd'
    label: secalert@redhat.com
  - url: >-
      https://github.com/OpenPrinting/cups/security/advisories/GHSA-r4wf-366f-f6g3
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-05T19:30:59.978Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.