Bug 2558311 (CVE-2026-114457)

Summary: CVE-2026-114457 mod_qos: Missing NUL termination in JSON value escaping permits out-of-bounds reads
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in mod_qos. An unauthenticated remote attacker could cause a Denial of Service (DoS) by sending a specially crafted JSON request when JSON body filtering is enabled. Due to improper string termination during the processing of percent-encoded input, the module reads past allocated memory boundaries, which can cause an Apache worker process to crash.
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Bug Depends On: 2558440, 2558441    
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Description OSIDB Bzimport 2026-10-21 14:54:38 UTC 
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.