Vulnerability · Published Oct 22, 2026 · Assigned by fedora

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

Medium 5.9

In plain English

A medium-severity out-of-bounds write in mod_qos from pbuchbinder. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.3%top 76.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:14	mod-qos	no fix listed	DEBIAN-CVE-2026-114458
Ubuntu:26.04:LTS	mod-qos	no fix listed	UBUNTU-CVE-2026-114458
Ubuntu:26.10	mod-qos	no fix listed	UBUNTU-CVE-2026-114458

Affected products (as reported)

Vendor	Product	Versions
pbuchbinder	mod_qos	11.7411.7611.79

Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://access.redhat.com/security/cve/CVE-2026-114458 vdb-entry, x_refsource_REDHAT
RHBZ#2558393 issue-tracking, x_refsource_REDHAT