An integer overflow in NATS Server before 2.0.2 allows a remote attacker to crash the…
Priority LOW 36CWE-190Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-190 and the CVSS impact.
Summary
An integer overflow in NATS Server before 2.0.2 allows a remote attacker to crash the server by sending a crafted request. If authentication is enabled, then the remote attacker must have first authenticated.
Why it matters now
EPSS 0.01773 78th percentileScored 2026-11-07
Fix Fixed github.com/nats-io/nats-server/v2 (Go): 2.2.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | github.com/nats-io/nats-server/v2 (Go) | before 2.2.0 | 2.2.0 | Patch available | GHSA-jp4j-47f9-2vc3 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- github.com/nats-io/nats-server/v2 (Go) Vendor— Affected before 2.2.0 Fixed in 2.2.0 Patch available GHSA-jp4j-47f9-2vc3
Remediation
- Fix · GHSA-jp4j-47f9-2vc3 github.com/nats-io/nats-server/v2 (Go) Fixed in 2.2.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2019-13126
- 2026-10-03 Alias added: GHSA-jp4j-47f9-2vc3
References
Other 5
- https://www.twistlock.com/labs-blog/finding-dos-vulnerability-nats-go-fuzz-cve-2019-13126/
- https://github.com/nats-io/nats-server/pull/1441
- https://github.com/nats-io/nats-server/commit/07ef71ff98f45f8c2711be4aeaf484610d891dda
- https://github.com/nats-io/nats-server/commits/master
- https://www.twistlock.com/labs-blog/finding-dos-vulnerability-nats-go-fuzz-cve-2019-13126
More backstage Nats-server vulnerabilities
- TI-2026-22233 NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead CVSS 3.1HIGH 7.5
- TI-2022-11116 NATS nats-server 2.2.0 through 2.7.4 allows directory traversal because of an unintended… CVSS 3.1CRITICAL 9.8
- TI-2020-16319 The JWT library in NATS nats-server before 2.1.9 has Incorrect Access Control because of… CVSS 3.1CRITICAL 9.8
- TI-2026-25637 NATS has MQTT plaintext password disclosure CVSS 3.1HIGH 8.6
- TI-2022-08320 NATS nats-server before 2.7.2 has Incorrect Access Control. CVSS 3.1HIGH 8.8
- TI-2026-41950 NATS Server: Pre-auth server crash via double INFO in leafnode handshake CVSS 3.1HIGH 7.5
Sources
- CVE-2019-13126 · CVE Program
- CVE-2019-13126 · NVD
- FIRST EPSS
- GHSA-jp4j-47f9-2vc3 · GitHub Advisory Database · CC BY 4.0
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