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Made with love by Amit Schendel & Alon Barad

CVE-2025-68272

Sinking the Ship: Signal K Server Heap Exhaustion (CVE-2025-68272)

Amit Schendel
Amit Schendel
Senior Security Researcher

Jan 2, 2026·5 min read·20 visits

Executive Summary (TL;DR)

Signal K Server < 2.19.0 contains an unauthenticated memory leak in its device authorization flow. Attackers can spam connection requests with large payloads, filling the JavaScript heap and crashing the server. Fix: Upgrade to 2.19.0+.

A critical Denial of Service vulnerability in Signal K Server allows unauthenticated remote attackers to crash the application via heap exhaustion. By flooding the access request endpoint, the Node.js process runs out of memory, potentially taking down navigation data integration on equipped vessels.

Official Patches

Signal KCommit fixing the resource exhaustion

Fix Analysis (2)

Technical Appendix

CVSS Score
7.5/ 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Probability
0.04%
Top 100% most exploited

Affected Systems

Signal K Server < 2.19.0

Affected Versions Detail

Product
Affected Versions
Fixed Version
Signal K Server
Signal K
< 2.19.02.19.0
AttributeDetail
CWECWE-400 (Uncontrolled Resource Consumption)
Attack VectorNetwork
CVSS v3.17.5 (High)
ImpactDenial of Service (Availability)
Privileges RequiredNone
ComponentAccess Request Handler

MITRE ATT&CK Mapping

T1499Endpoint Denial of Service
Impact
T1499.003Application Exhaustion Flood
Impact
CWE-400
Uncontrolled Resource Consumption

The software does not properly restrict the size or amount of resources that are requested or influenced by an actor, which can be used to consume more resources than intended.

Known Exploits & Detection

Research AnalysisExploitation is trivial via standard HTTP POST flooding scripts.

Vulnerability Timeline

Vulnerability Analysis Published
2025-02-14
Patched in v2.19.0
2025-01-20

References & Sources

  • [1]GitHub Security Advisory

Attack Flow Diagram

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