EUVD-2026-19806
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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3Description
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a use-after-free vulnerability exists in the CUPS scheduler (cupsd) when temporary printers are automatically deleted. cupsdDeleteTemporaryPrinters() in scheduler/printers.c calls cupsdDeletePrinter() without first expiring subscriptions that reference the printer, leaving cupsd_subscription_t.dest as a dangling pointer to freed heap memory. The dangling pointer is subsequently dereferenced at multiple code sites, causing a crash (denial of service) of the cupsd daemon. With heap grooming, this can be leveraged for code execution.
Analysis
Local denial of service and potential remote code execution in OpenPrinting CUPS 2.4.16 and prior occurs when the scheduler (cupsd) deletes temporary printers without expiring associated subscriptions, leaving dangling pointers in memory that are subsequently dereferenced. An unauthenticated local attacker can crash the cupsd daemon or, with heap grooming techniques, achieve arbitrary code execution on systems running affected CUPS versions.
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