CVE-2026-105326 Cups: cups: argument injection in mailto notifier via notify-recipient-uri
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.
CVSS 3.1 detail
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:NExploitable with local access to the machine, with an ordinary account and without any user action; the impact on data or service is limited.
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- Low
- Interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10 | Versions not published | |
| Red Hat Enterprise Linux 8 | Versions not published | |
| Red Hat Enterprise Linux 9 | Versions not published | |
| Red Hat Hardened Images 2.4 | earliest → < 2.4.19-4.3.hum1 | 2.4.19-4.3.hum1 |