CVE-2026-58207 NATS Server: Remote crash via integer overflow in Connz pagination
A remote attacker can crash the NATS server by sending crafted pagination parameters that cause an integer overflow, requiring an upgrade to patched versions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58207?
CVE-2026-58207 is a high-severity vulnerability in nats-io nats-server, published on 8 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-190
Which versions are affected by CVE-2026-58207?
It affects 1 product.
Products include Linuxfoundation Nats-Server.
How do I fix CVE-2026-58207?
Upgrade to a fixed version.
Is CVE-2026-58207 being exploited?
There is no known exploitation of CVE-2026-58207 in the wild and no public exploit code.
Other vulnerabilities in nats-io nats-server
- CVE-2022-28357 NATS nats-server allows directory traversal via unintended path to a management action
- CVE-2026-58253 NATS Server: Route API Auth Bypass
- CVE-2022-24450 Incorrect Authorization in NATS nats-server
- CVE-2026-33216 NATS has MQTT plaintext password disclosure
- CVE-2026-58210 NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory
Sources
Also known as AZL-92241, DEBIAN-CVE-2026-58207, GHSA-q59r-vq66-pxc2, UBUNTU-CVE-2026-58207.