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CVE-2026-114458— Mod_qos: undersized connection-monitor scratch array permits heap buffer overflow

Quick assessment

Affected
pbuchbinder mod_qos
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 mod_qos 模块中发现了一个漏洞。未经身份验证的远程攻击者可以通过向目标服务器维持大量并发低速率连接，引发拒绝服务（DoS）攻击。当连接速率监控功能启用时，该模块在记录客户端 IP 地址时未能验证数组边界，导致添加的连接记录数量超出已分配缓冲区的容量。此问题会引发堆内存损坏，进而导致 Web 服务器进程崩溃。

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-114458

Vulnerability Information
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Vulnerability Title
Mod_qos: undersized connection-monitor scratch array permits heap buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in mod_qos. An unauthenticated remote attacker can 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, allowing more connection records to be added than the allocated buffer can hold. This issue leads to heap memory corruption, which can crash the web server process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pbuchbinder mod_qos 11.74 -

II. Public POCs for CVE-2026-114458

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III. Intelligence Information for CVE-2026-114458

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Other References for CVE-2026-114458 (2)

Same Patch Batch · pbuchbinder · 2026-10-22 · 4 CVEs total

CVE-2026-114460 5.3 MEDIUM Mod_qos: query truncation during json body merging permits security-rule bypass
CVE-2026-114457 3.7 LOW Mod_qos: missing nul termination in json value escaping permits out-of-bounds reads
CVE-2026-114459 3.7 LOW Mod_qos: out-of-bounds reads in response-body substring matching

IV. Related Vulnerabilities

Same product: mod_qos
Same vendor: pbuchbinder
Same weakness: CWE-787

V. Comments for CVE-2026-114458

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