Integer overflow in nats-server - CVE-2026-58207
Published: June 30, 2026
Vulnerability identifier: #VU135927
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-58207
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to integer overflow in Connz pagination when processing account-scoped connection monitoring requests. A remote user can send a request with crafted pagination values to cause a denial of service.
On no-auth deployments, any client with network access to the client listener can reach the vulnerable request path. In multi-tenant deployments, exploitation depends on whether a tenant can publish to the imported account monitoring request subject.
Affected software
nats-server
How to mitigate CVE-2026-58207
Install security update from vendor's website.
nats-server - addressed in versions 2.12.12, 2.14.3