Bug 2502799 (CVE-2026-64611)

Summary: CVE-2026-64611 libcupsfilters: cups-filters: libcupsfilters: CPU exhaustion via infinite loop in cfIEEE1284NormalizeMakeModel()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in libcupsfilters. The cfIEEE1284NormalizeMakeModel() function enters an infinite loop when processing a printer-advertised IEEE-1284 device ID with an empty model field, causing sustained CPU consumption. A network-adjacent attacker could exploit this by broadcasting a specially crafted printer advertisement, leading to denial of service.
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Bug Depends On: 2506364    
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Description OSIDB Bzimport 2026-07-20 13:37:03 UTC 
libcupsfilters through 2.1.1 contains a denial-of-service flaw in cfIEEE1284NormalizeMakeModel() in cupsfilters/ieee1284.c. When processing an IEEE-1284 device ID with an empty MDL field, modelptr equals buffer after copying zero model characters, causing the dedup loop at line 1122 to call strncasecmp(buffer, modelptr, 0) which always returns 0 and move_right_part(buffer, bufsize, modelptr, 0) which makes no progress. The loop never terminates and pins one CPU core indefinitely. The function is reachable over the network via cfIEEE1284GetMakeModel() called by cups-browsed on printer-advertised device IDs (IPP/DNS-SD). CWE-835. No upstream fix; PR #139 / commit 7c45e5f addresses an adjacent OOB-read only.
Comment 2 errata-xmlrpc 2026-08-19 13:19:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:56965 https://access.redhat.com/errata/RHSA-2026:56965