Bug 2558440

Summary: CVE-2026-114457 mod_qos: Missing NUL termination in JSON value escaping permits out-of-bounds reads [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Vladimir Vasilev <vvasilev>
Component: mod_qosAssignee: Neil Hanlon <neil>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: low Docs Contact:
Priority: low    
Version: epel10CC: christof, neil
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["564632c1-8450-4be4-854d-d2a8494b2b6a"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2558311    

Description Vladimir Vasilev 2026-10-21 18:23:50 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A flaw was found in mod_qos. With mod_parp available and JSON body filtering enabled, the j_escape_url() helper can fill its allocation with percent-encoded input without leaving space for a terminating NUL byte. Subsequent query construction treats the buffer as a terminated string and may read past its end. An unauthenticated remote client can supply a crafted JSON string to trigger this out-of-bounds read, which may crash an Apache worker process.