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Fencer Vulns
medium 6.5

CVE-2026-58251 json

NATS Server: Queue Subscribe Authz Bypass

published 2026-07-08 4 mo ago modified 2026-10-25 14 d ago also BIT-nats-2026-58251 , EUVD-2026-42369 , GHSA-jx8g-9g95-6322 , JLSEC-2026-1151

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami nats 2.11.16, 2.12.7
  • julia nats_server_jll 2.14.3+0
  • linuxfoundation nats-server 2.11.16, 2.12.7
  • nats nats_server 2.11.16, 2.12.7
  • nats nats_streaming_server 2.11.16, 2.12.7
  • nats-server Debian 14 2.14.1-1

debian advisories DEBIAN-CVE-2026-58251

  • telegraf Azure Linux 3.0 1.31.0-27

azure linux advisories AZL-92244

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-58251 updated cvss 6.5

github.com/nats-io/nats-server: NATS Server: Information disclosure due to bypass of subject deny rules via queue subscriptions

  • Red Hat Hardened Images nats-server2.12, nats-server2.14
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
bitnami nats
<2.11.16
>=2.12.0, <2.12.7
2.11.16
2.12.7
julia nats_server_jll
<2.14.3+0
2.14.3+0

Affected products

  • nats-io nats-server

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.