CVE-2026-115417
HIGH 8.2Memory 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.
Severe if exploited (CVSS 8.2), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.4%chance of exploitation in 30 days · 28th percentile
Impact if exploited
8.2CVSS 4.0 · HIGH
- ConfidentialityNone
- IntegrityNone
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
- ⚠Requirements: Specific conditions must be present
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
Search for new PoCs
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Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Data snapshot:
Weakness (CWE)
- CWE-789: Memory allocation with excessive size value
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References and research data (JSON)
Vendor product assessments
All currently supported Red Hat products · known not affected
Vendor assessment for this product only.
Reason: vulnerable code not present
Red Hat · CVE-2026-115417 · Updated 2026-10-23T10:43:41+00:00
All CVSS metrics
- HIGH 7.5 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - HIGH 8.2 v4.0 · CNA Primary
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - HIGH 8.2 v4.0 · NVD Secondary
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - HIGH 7.5 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
Patches & mitigations
- https://github.com/awslabs/aws-c-mqtt/releases/tag/v0.16.2 CVE record · AMZN · Updated 2026-10-22T20:34:50.961Z
NVD · CVE-2026-115417 · Updated 2026-10-23T17:17:17.303
Advisories
- https://github.com/awslabs/aws-c-mqtt/security/advisories/GHSA-g3x5-86mr-65p5 CVE record · AMZN · Updated 2026-10-22T20:34:50.961Z
NVD · CVE-2026-115417 · Updated 2026-10-23T17:17:17.303 - https://aws.amazon.com/security/security-bulletins/2026-147-aws/ CVE record · AMZN · Updated 2026-10-22T20:34:50.961Z
NVD · CVE-2026-115417 · Updated 2026-10-23T17:17:17.303 - https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115417.json Red Hat · CVE-2026-115417 · Updated 2026-10-23T10:43:41+00:00
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-108508 EUVD · EUVD-2026-108508
Technical & other
- https://access.redhat.com/security/cve/CVE-2026-115417 Red Hat · CVE-2026-115417 · Updated 2026-10-23T10:43:41+00:00
- https://www.cve.org/CVERecord?id=CVE-2026-115417 Red Hat · CVE-2026-115417 · Updated 2026-10-23T10:43:41+00:00