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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-114458
StatePUBLISHED
Assignerfedora
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-22 07:16:42 UTC
Updated2026-10-22 07:16:42 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-787 | CWE-787 Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Pbuchbinder Mod Qos affected 11.74 custom Not specified
CNA Pbuchbinder Mod Qos affected 11.76 custom Not specified
CNA Pbuchbinder Mod Qos affected 11.79 custom Not specified

References

ReferenceSourceLinkTags
access.redhat.com/security/cve/CVE-2026-114458 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Robin "drzobin" Larsson for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-10-17T14:23:45.000ZReported to Red Hat.
CNA2026-10-21T14:45:26.000ZMade public.

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