UBUNTU-CVE-2026-58250
NATS Server versions prior to 2.12.8 and 2.11.17 contain a vulnerability where an unauthenticated peer with network access to a leafnode listener with compression enabled can crash the server by sending repeated leafnode INFO protocol messages during the pre-authentication handshake. This denial-of-service issue is fixed in versions 2.12.8 and 2.11.17. The vulnerability affects specific Ubuntu package versions of nats-server. No known exploits are reported in the wild.
AI Analysis
Technical Summary
NATS Server, a messaging system server, has a denial-of-service vulnerability in versions before 2.12.8 and 2.11.17. An unauthenticated attacker with network access to a leafnode listener configured with compression can cause the server to crash by sending repeated leafnode INFO protocol messages before authentication and account setup complete. This issue is resolved in versions 2.12.8 and 2.11.17.
Potential Impact
The vulnerability allows an unauthenticated remote attacker to cause a denial-of-service (server crash) without requiring any privileges or user interaction. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Upgrade affected NATS Server installations to version 2.12.8 or 2.11.17 or later where this issue is fixed. No other mitigation or temporary workaround is indicated.
UBUNTU-CVE-2026-58250
Description
NATS Server versions prior to 2.12.8 and 2.11.17 contain a vulnerability where an unauthenticated peer with network access to a leafnode listener with compression enabled can crash the server by sending repeated leafnode INFO protocol messages during the pre-authentication handshake. This denial-of-service issue is fixed in versions 2.12.8 and 2.11.17. The vulnerability affects specific Ubuntu package versions of nats-server. No known exploits are reported in the wild.
CVSS v3.1
Score 7.5high
Affected software
pkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]~esm1?arch=source&distro=esm-apps/resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
NATS Server, a messaging system server, has a denial-of-service vulnerability in versions before 2.12.8 and 2.11.17. An unauthenticated attacker with network access to a leafnode listener configured with compression can cause the server to crash by sending repeated leafnode INFO protocol messages before authentication and account setup complete. This issue is resolved in versions 2.12.8 and 2.11.17.
Potential Impact
The vulnerability allows an unauthenticated remote attacker to cause a denial-of-service (server crash) without requiring any privileges or user interaction. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Upgrade affected NATS Server installations to version 2.12.8 or 2.11.17 or later where this issue is fixed. No other mitigation or temporary workaround is indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-58250
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:24.04:LTS","Ubuntu:25.10","Ubuntu:Pro:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a58b45d68715ace43d6be35
Added to database: 07/16/2026, 10:37:17 UTC
Last enriched: 07/16/2026, 11:35:59 UTC
Last updated: 07/31/2026, 19:24:49 UTC
Views: 7
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