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CVE.org (no NVD analysis yet)· CNA redhat

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

LowCVSS 2.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 10/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: azl3 cups 2.4.19-1 on Azure Linux 3.0 Release Notes; azl3 cups 2.4.19-2 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to azl3 cups 2.4.19-1 on Azure Linux 3.0 Release Notes; azl3 cups 2.4.19-2 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Oct 5, 2026
Updated
Nov 6, 2026
EPSS
0.2% · 13th percentile

Report tools

JSON

Action score

10

Monitor

Low priority for now.

CVSS
10 / 40 · 2.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
2.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-105326

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 9

    • all versionsaffected
    • all versionsaffected

  • Red Hat Red Hat Hardened Images

    • 2.4.19-4.3.hum1 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12cupsfrom 0—
Debian:14cupsbefore 2.4.20-12.4.20-1
openSUSE:Tumbleweedcupsbefore 2.4.20-1.12.4.20-1.1
Red Hat:hummingbird:1cupsbefore 0:2.4.19-4.3.hum10:2.4.19-4.3.hum1
Red Hat:hummingbird:1cups-clientbefore 0:2.4.19-4.3.hum10:2.4.19-4.3.hum1
Red Hat:hummingbird:1cups-develbefore 0:2.4.19-4.3.hum10:2.4.19-4.3.hum1
Red Hat:hummingbird:1cups-filesystembefore 0:2.4.19-4.3.hum10:2.4.19-4.3.hum1
Red Hat:hummingbird:1cups-ipptoolbefore 0:2.4.19-4.3.hum10:2.4.19-4.3.hum1
Red Hat:hummingbird:1cups-libsbefore 0:2.4.19-4.3.hum10:2.4.19-4.3.hum1
Red Hat:hummingbird:1cups-lpdbefore 0:2.4.19-4.3.hum10:2.4.19-4.3.hum1
Red Hat:hummingbird:1cups-printerappbefore 0:2.4.19-4.3.hum10:2.4.19-4.3.hum1
SUSE:Linux Enterprise Micro 5.3cupsbefore 2.2.7-150000.3.101.22.2.7-150000.3.101.2
SUSE:Linux Enterprise Server 12 SP5-LTSScupsbefore 1.7.5-20.76.11.7.5-20.76.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-10230Samba: command injection in wins server hook script
    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    44Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-103399Sep 30, 2026 · Libsoup: soupserver: http/1 request smuggling via undrained expect: 100-continue body
    21Monitor
  • ← EarlierCVE-2026-103641Oct 1, 2026 · Gegl: gegl04: gegl: out-of-bounds read in the radiance hdr uncompressed scanline decoder
    22Monitor
  • Later →CVE-2026-104033Oct 6, 2026 · Sssd: sssd: access control bypass via improper ldap shadow expiration check
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 cups 2.4.19-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 cups 2.4.19-2 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:cups2.4.20-1 · Debian:14Package registry (OSV)
opensuse:cups2.4.20-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:cups0:2.4.19-4.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-client0:2.4.19-4.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-devel0:2.4.19-4.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-filesystem0:2.4.19-4.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-ipptool0:2.4.19-4.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-libs0:2.4.19-4.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-lpd0:2.4.19-4.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-printerapp0:2.4.19-4.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:cups2.2.7-150000.3.101.2 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recorded+3 d
  3. TodayNov 13, 2026+39 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-10471511 days apartCifs-utils: mount.cifs credential-file option injection allows local privilege boundary bypass
    31Monitor
  • CVE-2026-12567236 days apartCockpit: cockpit-storaged: tang keyserver address from an untrusted luks header clevis token reaches curl's argument vector as an option
    26Monitor
  • CVE-2026-11158111 days apartLibblockdev: libblockdev: argument injection in ntfs/vfat label-setting helpers via udisks2 setlabel() d-bus method
    13Monitor

Not on record for this CVE: researcher credit · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-88 · Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓
  2. SSVC exploitation— → none
  3. Exploit maturity— → none

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records