TI-2026-69843 Aliases CVE-2026-107886

Double free in OpenPrinting CUPS printer-class management

MEDIUM 62CWE-415Published 2026-10-09 · Updated 2026-10-09

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · High
Fix status: Partial Red Hat: 1 fixed, 4 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

OpenPrinting CUPS from 1.4.8 before 2.4.20 contains a double free (CWE-415) in printer-class management. When a class member list is replaced and later validation fails, the class keeps a dangling pointer that a subsequent class deletion frees again. A client authorized to modify and delete classes can cause a denial of service for the whole scheduler, and the default policy requires @SYSTEM privileges. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

OpenPrinting CUPS before 2.4.20 contains a double-free in printer-class management. When CUPS-Add-Modify-Class replaces an existing class member list, add_class() frees pclass->printers without clearing the pointer. If subsequent validation fails, the class retains the dangling pointer; CUPS-Delete-Class subsequently frees the same allocation in cupsdDeletePrinter(). A client authorized to modify and delete classes can cause scheduler-wide denial of service. The default policy requires @SYSTEM privileges.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00241 15th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial CUPS (OpenPrinting): 2.4.20Red Hat: 1 advisoryRed Hat: 1 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
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

Vendor	Product	Affected versions	Fixed in	Status	Source
OpenPrinting	CUPS	1.4.8 to before 2.4.20	2.4.20	Patch available	CNA

CUPS VendorOpenPrinting Affected 1.4.8 to before 2.4.20 Fixed in 2.4.20 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:openprinting:cups::::::::	1.4.8 to before 2.4.20	Vulnerable	OpenPrinting

cpe:2.3:a:openprinting:cups:*:*:*:*:*:*:*:* Versions 1.4.8 to before 2.4.20 Vulnerable ·OpenPrinting

Remediation

Upgrade CUPS to version 2.4.20 or later. Red Hat ships the fix for Red Hat Hardened Images in RHSA-2026:81410. The sources list no fixed version for Red Hat Enterprise Linux 7, 8, 9 and 10.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA CUPS (OpenPrinting) Fixed in 2.4.20

Red Hat 1 advisory

RHSA-2026:81410 Released 2026-10-12 · Red Hat rating Moderate
Red Hat Hardened Images RPMs Security Update
- Red Hat Hardened Images cups-2.4.19-4.5.hum1@aarch64, cups-2.4.19-4.5.hum1@s390x, cups-2.4.19-4.5.hum1@src +22

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-09
OpenPrinting CUPS 2.4.20
3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-69846 NULL pointer dereference in OpenPrinting CUPS scheduler via print jobsPriority MEDIUM 58
- TI-2026-69844 NULL pointer dereference in CUPS lets job submissions crash cupsdPriority LOW 24
Show all 3 records →

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 7	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred
Red Hat Hardened Images	Fixed	RHSA-2026:81410

Not affected: 1 product

Red Hat Enterprise Linux 6

Timeline

2026-10-09 Threatist record created from CVE-2026-107886
2026-10-10 Affected versions changed · Red Hat
2026-10-10 CVSS score added · Red Hat
2026-10-10 CISA SSVC decision points changed
2026-10-10 Priority changed: LOW → MEDIUM
2026-10-13 Fix available: RHSA-2026:81410 · Red Hat
2026-10-13 Fix available: Red Hat Hardened Images · Red Hat
2026-10-21 CVSS score added · NVD

References

Exploit 1

https://github.com/OpenPrinting/cups/security/advisories/GHSA-pwg4-pv39-8c22

TI-2025-35903 cups has Authentication bypass with AuthType Negotiate CVSS 3.1HIGH 8.0
TI-2023-17077 CUPS vulnerable to use-after-free in cupsdAcceptClient() CVSS 3.1HIGH 7.1
TI-2026-27200 Path traversal in OpenPrinting cups CVSS 3.1MEDIUM 6.5
TI-2023-04157 OpenPrinting CUPS/libppd Postscript Parsing Heap Overflow CVSS 3.1HIGH 7.0
TI-2026-74874 Path traversal in OpenPrinting CUPS banner handling discloses files CVSS 3.1MEDIUM 5.3
TI-2026-27201 OpenPrinting CUPS: Heap overflow in `get_options()` CVSS 3.1MEDIUM 5.3

See all 24 →

Sources

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