NATS Server: Remote crash via integer overflow in Connz pagination

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Summary

CVECVE-2026-58207
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 21:16:52 UTC
Updated2026-07-09 16:25:45 UTC
DescriptionNATS 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.

Risk And Classification

Primary CVSS: v3.1 7.7 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Problem Types: CWE-190 | CWE-190 CWE-190: Integer Overflow or Wraparound

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
3.1CNADECLARED7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nats-io Nats-server affected < 2.12.12 Not specified
CNA Nats-io Nats-server affected >= 2.14.0-RC.1, < 2.14.3 Not specified

References

ReferenceSourceLinkTags
github.com/nats-io/nats-server/releases/tag/v2.12.12 [email protected] github.com
github.com/nats-io/nats-server/security/advisories/GHSA-q59r-vq66-pxc2 [email protected] github.com
github.com/nats-io/nats-server/commit/2ae047139e37a38cb01e259a67909e7a39... [email protected] github.com
github.com/nats-io/nats-server/commit/894d9411927681d66ce349bf1afe49608d... [email protected] github.com
github.com/nats-io/nats-server/releases/tag/v2.14.3 [email protected] github.com
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