Integer Overflow or Wraparound Affecting github.com/nats-io/nats-server/v2/server package, versions <2.12.12>=2.14.0-RC.1 <2.14.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published9 Jul 2026
- disclosed8 Jul 2026
- creditSaleh
Introduced: 8 Jul 2026
CVE-2026-58207 Â (opens in a new tab)How to fix?
Upgrade github.com/nats-io/nats-server/v2/server to version 2.12.12, 2.14.3 or higher.
Overview
github.com/nats-io/nats-server/v2/server is an A simple, secure and performant communications system for digital systems, services and devices.
Affected versions of this package are vulnerable to Integer Overflow or Wraparound in the Connz connection monitoring pagination handler, which processes client-supplied pagination values before the response window is safely bounded. An attacker can crash the server and cause denial of service by sending an account-scoped connection monitoring request with pagination values that trigger arithmetic overflow. Exploitation requires the ability to publish to the account's system monitoring subject, so in no-auth deployments any client on the client listener qualifies, while in multi-tenant setups it depends on whether a tenant can publish to the imported monitoring subject.
Workaround
This vulnerability can be avoided by restricting publish access to the system request subjects for untrusted users, so they cannot reach the connection monitoring endpoint.