What’s Vulnerable › Vulnerabilities

CVE-2026-107886

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-10-09 · updated 2026-10-20
• Weakness: CWE-415

Description

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.

Affected products

• OpenPrinting cups: from 1.4.8 before 2.4.20 — fixed in 2.4.20

How to fix

Upgrade to a fixed version: OpenPrinting cups 2.4.20. Check the vendor advisory for mitigations.

References

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

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