Bug 2548358 (CVE-2026-107890)

Summary: CVE-2026-107890 cups: cups: Denial of Service via repeated IPP group tags
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers, zdohnal
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in CUPS. An attacker who can submit print jobs can exploit this issue by sending a crafted request containing repeated Internet Printing Protocol (IPP) group tags. This triggers a NULL pointer dereference during job processing, causing the print scheduler daemon (cupsd) to crash and resulting in a Denial of Service (DoS) across all print queues.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2548655    
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Description OSIDB Bzimport 2026-10-09 04:31:24 UTC 
OpenPrinting CUPS before 2.4.20 contains a NULL pointer dereference caused by repeated IPP group tags in job-creation requests. IPP parsing creates unnamed separator attributes with IPP_TAG_ZERO, but add_job() converts these separators to IPP_TAG_JOB. During job startup, get_options()/ipp_length() subsequently calls strlen() on a NULL attribute name, terminating cupsd and disrupting all queues. A single crafted Print-Job request can trigger the crash when the client can reach the scheduler and submit jobs to an accepting, enabled queue supporting the submitted document format. Anonymous submission is possible when permitted by listener and access-control configuration.