CVE-2026-39320: CWE-400: Uncontrolled Resource Consumption in SignalK signalk-server
SignalK Server versions prior to 2. 25. 0 are vulnerable to an unauthenticated Regular Expression Denial of Service (ReDoS) attack. The vulnerability arises from the WebSocket subscription handling logic where unescaped regex metacharacters in the 'context' parameter can trigger catastrophic backtracking in the Node. js event loop. This causes the server CPU to spike to 100%, resulting in a complete denial of service. The issue is fixed in version 2. 25. 0.
AI Analysis
Technical Summary
CVE-2026-39320 describes a high-severity vulnerability in SignalK Server before version 2.25.0. An attacker can exploit an unauthenticated ReDoS by injecting unescaped regex metacharacters into the 'context' parameter of a WebSocket stream subscription. This causes catastrophic backtracking during regex evaluation of long string identifiers such as the server's self UUID, leading to total denial of service via CPU exhaustion. The vulnerability is addressed in SignalK Server version 2.25.0.
Potential Impact
Successful exploitation results in a denial of service condition where the server becomes completely unresponsive due to CPU resource exhaustion. This disrupts all API and socket communications handled by the server. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Upgrade SignalK Server to version 2.25.0 or later, where this vulnerability is fixed. Patch status is not explicitly confirmed in the advisory, but the description states version 2.25.0 contains a fix. No other mitigations are specified.
CVE-2026-39320: CWE-400: Uncontrolled Resource Consumption in SignalK signalk-server
Description
SignalK Server versions prior to 2. 25. 0 are vulnerable to an unauthenticated Regular Expression Denial of Service (ReDoS) attack. The vulnerability arises from the WebSocket subscription handling logic where unescaped regex metacharacters in the 'context' parameter can trigger catastrophic backtracking in the Node. js event loop. This causes the server CPU to spike to 100%, resulting in a complete denial of service. The issue is fixed in version 2. 25. 0.
CVSS v3.1
Score 7.5high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-39320 describes a high-severity vulnerability in SignalK Server before version 2.25.0. An attacker can exploit an unauthenticated ReDoS by injecting unescaped regex metacharacters into the 'context' parameter of a WebSocket stream subscription. This causes catastrophic backtracking during regex evaluation of long string identifiers such as the server's self UUID, leading to total denial of service via CPU exhaustion. The vulnerability is addressed in SignalK Server version 2.25.0.
Potential Impact
Successful exploitation results in a denial of service condition where the server becomes completely unresponsive due to CPU resource exhaustion. This disrupts all API and socket communications handled by the server. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Upgrade SignalK Server to version 2.25.0 or later, where this vulnerability is fixed. Patch status is not explicitly confirmed in the advisory, but the description states version 2.25.0 contains a fix. No other mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-06T19:31:07.266Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e70c3119fe3cd2cda19908
Added to database: 4/21/2026, 5:33:37 AM
Last enriched: 4/28/2026, 6:02:58 AM
Last updated: 6/5/2026, 4:23:54 PM
Views: 54
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.