NATS Server: Remote crash via integer overflow in Connz pagination (nats-io nats-server)

CVE-2026-58207

HIGH 7.7

At a glance

Source: NVD
EPSS: EPSS 0.56 % · percentile 47 (2026-10-31)
State: PUBLISHED
Published: 2026-07-08 20:15 UTC
Updated: 2026-07-09 14:41 UTC
Assigner: GitHub_M
NVD status: Analyzed

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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.

Weaknesses (CWE)

CWE-190 — Integer Overflow or Wraparound

References

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 7.7	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H	GitHub_M
CVSS 3.1	HIGH 7.7	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H	NVD · security-advisories@github.com (Secondary)
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2026-42389
GCVE · GCVE-0-2026-58207

Affected configurations (NVD CPE)

cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:* ≥ 2.12.0 < 2.12.12
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:* ≥ 2.14.0 < 2.14.3

Affected products

Product	Versions
nats-io · nats-server	affected < 2.12.12 ; affected >= 2.14.0-RC.1, < 2.14.3

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD

⚠️ NATS Server: Remote crash via integer overflow in Connz pagination (nats-io nats-server)