CVE-2026-114459
LowCVSS 3.7Exploitation Probability (EPSS)
Low risk19th percentile - higher than 19% of all known CVEs
Summary
A flaw was found in mod_qos where improper boundary checking when inspecting HTTP response bodies causes the module to read memory outside allocated buffer boundaries. An unauthenticated remote attacker can exploit this by triggering specially crafted server responses, crashing an Apache worker process and causing a Denial of Service (DoS).
Risk Assessment
An unauthenticated attacker can repeatedly crash Apache worker processes, making network services unavailable. This impacts the availability of hosted applications.
Recommendation
Update mod_qos to a version containing the fix or temporarily disable HTTP response body inspection. Monitor Apache logs for repeated worker process crashes.
Other vulnerabilities in mod_qos
See all- CVE-2026-114460Medium
A flaw was found in mod_qos. An off-by-one pointer calculation error occurs when merging request body parameters with an existing URL query, which truncates the query string during security evaluation while leaving the actual request unchanged. An unauthenticated remote attacker could exploit this vulnerability by submitting a crafted request that conceals prohibited values from inspection, resulting in a bypass of configured security rules.
- CVE-2026-114458Medium
A flaw was found in mod_qos that allows an unauthenticated remote attacker to cause a Denial of Service (DoS) by maintaining numerous concurrent low-rate connections to a target server. When connection rate monitoring is active, the module fails to verify array boundaries when recording client IP addresses, leading to heap memory corruption and a crash of the web server process.
- CVE-2026-114457Low
A flaw was found in mod_qos that allows an unauthenticated remote attacker to 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 processing of percent-encoded input, the module reads past allocated memory boundaries, which can crash an Apache worker process.
Original NVD description (English source)
A flaw was found in mod_qos. When inspecting HTTP response bodies, improper boundary checking can cause the module to read memory outside allocated buffer boundaries. An unauthenticated remote attacker can exploit this vulnerability by triggering specifically crafted server responses, causing an Apache worker process to crash and resulting in a Denial of Service (DoS).
Vulnerability data from NVD (NIST) · CISA KEV · EPSS