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Vulnerabilities

Security fix · CVE-2026-58251

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system.

Published Jul 8, 2026 · catalog updated Oct 26, 2026 · NATS Server is a

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-58251. EPSS is 0.46%. Act only if a listed version of NATS Server is a is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (NATS Server is a).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.46%
Remediation
Advisory link
Affected products
Debian:12 nats-server · Debian:13 nats-server · Debian:14 nats-server

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, an authenticated user with subscription deny permissions could bypass a plain subject deny rule by using a queue subscription, because queue-specific deny evaluation could override the plain subject deny result when the queue name itself was not denied. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 nats-server2.10.1-1, 2.10.16-1, 2.10.18-1
  • Debian:13 nats-server2.10.27-1, 2.12.4-1, 2.12.6-1
  • Debian:14 nats-server0 → 2.14.1-1

How to fix CVE-2026-58251

  • Upgrade

    CVE-2026-58251 lists a fix boundary at 2.14.1-1. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 2.14.1-1 · 6 other ranges on the advisory

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-58251. EPSS is 0.46%. Act only if a listed version of NATS Server is a is installed.

Which versions are affected?

Compare what you have installed with 2.10.1-1, 2.10.16-1, 2.10.18-1, 2.10.27-1, 2.12.4-1, 2.12.6-1, 0 → 2.14.1-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.46%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 8, 2026 · Trivy Vulnerability DB

    Detected

    NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, an authenticated user with subscription deny permissions could bypass a plain subject deny rule by using a queue subscription, because queue-specific deny evaluation could override the plain subject deny result when the queue name itself was not denied. This issue

  2. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    nats-server fixed in 2.14.1-1

  3. Oct 26, 2026 · Trivy Vulnerability DB

    Fix available

    nats-server fixed in 2.14.1-1

  4. Oct 26, 2026 · Trivy Vulnerability DB

    Updated

    NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, an authenticated user with subscription deny permissions could bypass a plain subject deny rule by using a queue subscription, because queue-specific deny evaluation could override the plain subject deny result when the queue name itself was not denied. This issue

Sources

  • CVE.orgVulnerability recordCVE-2026-58251

    Official CVE identifier

    cve.org
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-58251

    NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, an authenticated user with subscription deny permissions could bypass a plain subject deny rule by using a queue subscription, because queue-spe

    osv.dev

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 26, 2026
  • Trivy Vulnerability DBOct 26, 2026