Integer overflow in Linuxfoundation Nats-Server
CVE-2026-58207
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, a client able to send account-scoped connection monitoring requests could crash the server by supplying Connz pagination Offset and Limit values that overflowed internal arithmetic before the response window was safely bounded. This issue is fixed in versions 2.14.3 and 2.12.12.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Linuxfoundation Nats-Server
- Nats-Io Nats-Server — versions < 2.12.12, >= 2.14.0-RC.1, < 2.14.3
Weakness classification (CWE)
References
- github.com/nats-io/nats-server/security/advisories/GHSA-q59r-vq66-pxc2 (Mitigation, Vendor Advisory)
- github.com/nats-io/nats-server/commit/2ae047139e37a38cb01e259a67909e7a39fa38e9 (Patch)
- github.com/nats-io/nats-server/commit/894d9411927681d66ce349bf1afe49608dc0c1a3 (Patch)
- github.com/nats-io/nats-server/releases/tag/v2.12.12 (Release Notes)
- github.com/nats-io/nats-server/releases/tag/v2.14.3 (Release Notes)
Frequently asked questions
- What is CVE-2026-58207?
- CVE-2026-58207 is a high-severity vulnerability in Linuxfoundation Nats-Server, classified under Integer Overflow or Wraparound. CVSS score: 7.7/10. Published 2026-07-08.
- How severe is CVE-2026-58207?
- High severity. CVSS v3 base score is 7.7 out of 10.