Vulnerability · Published Oct 5, 2026 · Assigned by redhat
CVE-2026-105326Cups: cups: argument injection in mailto notifier via notify-recipient-uri
Low 2.5
In plain English
A low-severity argument injection in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | cups | no fix listed | DEBIAN-CVE-2026-105326 |
| Debian:13 | cups | no fix listed | DEBIAN-CVE-2026-105326 |
| Debian:14 | cups | no fix listed | DEBIAN-CVE-2026-105326 |
| Ubuntu:22.04:LTS | cups | no fix listed | UBUNTU-CVE-2026-105326 |
| Ubuntu:24.04:LTS | cups | no fix listed | UBUNTU-CVE-2026-105326 |
| Ubuntu:26.04:LTS | cups | no fix listed | UBUNTU-CVE-2026-105326 |
| Ubuntu:26.10 | cups | no fix listed | UBUNTU-CVE-2026-105326 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Hardened Images | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
Weakness: CWE-88 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
References
- RHSA-2026:77638 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-105326 vdb-entry, x_refsource_REDHAT
- RHBZ#2545835 issue-tracking, x_refsource_REDHAT
- https://github.com/OpenPrinting/cups/commit/1244ed9
- https://github.com/OpenPrinting/cups/commit/611d1bd
- https://github.com/OpenPrinting/cups/security/advisories/GHSA-r4wf-366f-f6g3