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CVE-2026-58207

NATS Server: Remote crash via integer overflow in Connz pagination

MEDIUM
6.5
CVSS Score
Published: July 8, 2026 at 08:15 PM UTC
Updated: October 25, 2026 at 05:10 PM UTC
2 products affected across 2 vendorsNats ServerNats Server

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nats Server· Linuxfoundation
95%
2.12.0 ≤ v < 2.12.122.14.0 ≤ v < 2.14.3
Affected range stops below 2.12.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.14.3, so it looks safe — our inference, not a vendor statement
Nats Server· Nats Io
90%
v < 2.12.12
Affected range stops below 2.12.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.14.3, so it looks safe — our inference, not a vendor statement

References (5)

x_refsource_CONFIRMMitigationVendor Advisory
Source: cverecord
https://github.com/nats-io/nats-server/security/advisories/GHSA-q59r-vq66-pxc2
x_refsource_MISCPatch
Source: cverecord
https://github.com/nats-io/nats-server/commit/2ae047139e37a38cb01e259a67909e7a39fa38e9
x_refsource_MISCPatch
Source: cverecord
https://github.com/nats-io/nats-server/commit/894d9411927681d66ce349bf1afe49608dc0c1a3
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/nats-io/nats-server/releases/tag/v2.12.12
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/nats-io/nats-server/releases/tag/v2.14.3

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-190

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