CVE-2026-58250: CWE-476: NULL Pointer Dereference in nats-io nats-server
A NULL pointer dereference vulnerability exists in nats-io nats-server versions prior to 2.11.17 and 2.12.8. An unauthenticated attacker with network access to a leafnode listener that has compression enabled can crash the server by sending repeated leafnode INFO protocol messages during the pre-authentication handshake. This issue is fixed in versions 2.11.17 and 2.12.8.
AI Analysis
Technical Summary
NATS Server, a high-performance messaging server, contains a NULL pointer dereference vulnerability (CWE-476) in its leafnode listener component when compression is enabled. Prior to versions 2.11.17 and 2.12.8, an unauthenticated remote attacker can cause a denial of service by repeatedly sending leafnode INFO protocol messages before authentication and account setup complete, leading to a server crash. The vulnerability is resolved in versions 2.11.17 and 2.12.8.
Potential Impact
The vulnerability allows an unauthenticated remote attacker with network access to a leafnode listener with compression enabled to cause a denial of service by crashing the nats-server. There is no impact on confidentiality or integrity, but availability is severely affected.
Mitigation Recommendations
Upgrade nats-server to version 2.11.17 or 2.12.8 or later to apply the official fix. No other mitigation or workaround is indicated.
CVE-2026-58250: CWE-476: NULL Pointer Dereference in nats-io nats-server
Description
A NULL pointer dereference vulnerability exists in nats-io nats-server versions prior to 2.11.17 and 2.12.8. An unauthenticated attacker with network access to a leafnode listener that has compression enabled can crash the server by sending repeated leafnode INFO protocol messages during the pre-authentication handshake. This issue is fixed in versions 2.11.17 and 2.12.8.
CVSS v3.1
Score 7.5high
Affected software
pkg:github/nats-io/nats-serverRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
NATS Server, a high-performance messaging server, contains a NULL pointer dereference vulnerability (CWE-476) in its leafnode listener component when compression is enabled. Prior to versions 2.11.17 and 2.12.8, an unauthenticated remote attacker can cause a denial of service by repeatedly sending leafnode INFO protocol messages before authentication and account setup complete, leading to a server crash. The vulnerability is resolved in versions 2.11.17 and 2.12.8.
Potential Impact
The vulnerability allows an unauthenticated remote attacker with network access to a leafnode listener with compression enabled to cause a denial of service by crashing the nats-server. There is no impact on confidentiality or integrity, but availability is severely affected.
Mitigation Recommendations
Upgrade nats-server to version 2.11.17 or 2.12.8 or later to apply the official fix. No other mitigation or workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-29T21:54:30.330Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4eafe7c9d9e3dbe3adea35
Added to database: 07/08/2026, 20:15:35 UTC
Last enriched: 07/08/2026, 20:28:23 UTC
Last updated: 07/08/2026, 20:28:23 UTC
Views: 2
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