High · CVSS 8.2CVE-2026-115417

Memory allocation with excessive size value in the MQTT 3.1.1 compatibility adapter in aws-c-mqttCVE-2026-115417

Answer in brief

CVE-2026-115417 records a High severity (CVSS 8.2) vulnerability in Memory allocation with excessive size value in the MQTT 3.1.1 compatibility adapter in aws-c-mqtt. The current sources do not mark it as known exploited. The current feed maps AWS/aws-c-mqtt (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 22, 2026Updated Oct 22, 2026Source checked Oct 22, 2026First seen by HOL Oct 22, 2026Material review Oct 22, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.2
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps AWS/aws-c-mqtt (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
AWS/aws-c-mqttgeneric	>=0.9.1 <0.16.2	0.16.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for AWS/aws-c-mqtt.
Review the reported fix. Update AWS/aws-c-mqtt to 0.16.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 22, 2026

Sources and claim methodology

Upstream source description

Memory allocation with excessive size value in the MQTT 3.1.1 compatibility adapter in AWS aws-c-mqtt before 0.16.2 might allow a remote actor to cause a denial of service of the client application. To remediate this issue, users should upgrade to aws-c-mqtt 0.16.2 or later, or to an AWS Common Runtime or AWS IoT Device SDK release that bundles it.

Quoted source text, attributed separately from HOL analysis.

Ghidra through 12.2 Denial of Service via BinaryField Memory AllocationAlso CWE-789