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TI-2026-67849 Aliases CVE-2026-105326

Argument injection in CUPS mailto notifier

Priority LOW 12CWE-88Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
Low · None · None
Fix status
Partial Red Hat: 1 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-88.

Summary

An argument injection flaw in CUPS affects Red Hat Hardened Images, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 and Red Hat Enterprise Linux 10. When email notification is configured, the scheduler passes a mailto notify-recipient-uri value to sendmail without stopping values that start with a dash from being read as options (CWE-88). An attacker who can reach the CUPS service can supply a crafted recipient to influence sendmail behavior, and the result depends on the installed mail transfer agent and network exposure of CUPS.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00217 12th percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 1 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Hardened Images—2.4.19-4.3.hum1Patch availableCNA
Red HatRed Hat Enterprise Linux 10——No fix listedCNA
Red HatRed Hat Enterprise Linux 8——No fix listedCNA
Red HatRed Hat Enterprise Linux 9——No fix listedCNA
Red HatRed Hat Enterprise Linux 9——No fix listedCNA
  • Red Hat Hardened Images VendorRed Hat Affected — Fixed in 2.4.19-4.3.hum1 Patch available CNA
  • Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE names CNA · 4

CPEVersionsRoleVendor
cpe:/a:redhat:hummingbird:11—Red Hat
cpe:/a:redhat:enterprise_linux:1010—Red Hat
cpe:/a:redhat:enterprise_linux:88—Red Hat
cpe:/a:redhat:enterprise_linux:99—Red Hat
  • cpe:/a:redhat:hummingbird:1 Versions 1 — ·Red Hat
  • cpe:/a:redhat:enterprise_linux:10 Versions 10 — ·Red Hat
  • cpe:/a:redhat:enterprise_linux:8 Versions 8 — ·Red Hat
  • cpe:/a:redhat:enterprise_linux:9 Versions 9 — ·Red Hat

Remediation

Red Hat Hardened Images is fixed in version 2.4.19-4.3.hum1 by RHSA-2026:77638, released 2026-10-07. The sources list no fixed version for Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 or Red Hat Enterprise Linux 10, and Red Hat's plan for these products is none available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Red Hat 1 advisory

  • RHSA-2026:77638 Released 2026-10-07 · Red Hat rating Low
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images cups-1:2.4.19-4.3.hum1@aarch64, cups-1:2.4.19-4.3.hum1@src, cups-1:2.4.19-4.3.hum1@x86_64 +15

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat Hardened ImagesFixed RHSA-2026:77638

Timeline

  1. 2026-10-05 Threatist record created from CVE-2026-105326
  2. 2026-10-06 Affected versions changed · Red Hat
  3. 2026-10-06 CVSS score added · Red Hat
  4. 2026-10-06 CISA SSVC decision points changed
  5. 2026-10-07 Fix available: [email protected] · CNA
  6. 2026-10-07 1 new reference · CNA
  7. 2026-10-07 Fix available: RHSA-2026:77638 · Red Hat
  8. 2026-10-08 Fix available: Red Hat Hardened Images · Red Hat

References

Advisory 1

Other 5

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  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
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Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences