CVE-2026-33247 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-33247MEDIUM

nats-io nats-server — NATS credentials are exposed in monitoring port via command-line argv

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   L   N  U  H  N  N    5.3   .0041   34.7     —

AFFECTED
  Product      Versions     Fixed
  nats-server  < 2.11.15 –  —

TIMELINE
  Mar 18  Reserved by GitHub_M
  Mar 25  Published (CNA: GitHub_M)
  Aug 17  RESCORED — CVE-2026-33247 (nats-io nats-server). CVSS 7.4 → 5.3 (NVD).

CWE-215 · CNA: GitHub_M · CVSS v3.1 · 8 references · NVD status: Modified

Description

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, if a nats-server is run with static credentials for all clients provided via argv (the command-line), then those credentials are visible to any user who can see the monitoring port, if that too is enabled. The `/debug/vars` end-point contains an unredacted copy of argv. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, configure credentials inside a configuration file instead of via argv, and do not enable the monitoring port if using secrets in argv. Best practice remains to not expose the monitoring port to the Internet, or to untrusted network sources.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
March 18, 2026	Reserved	Reserved by GitHub_M
March 25, 2026	Published	Published (CNA: GitHub_M)
August 17, 2026	RESCORED	RESCORED — CVE-2026-33247 (nats-io nats-server). CVSS 7.4 → 5.3 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
nats-io	nats-server	—	< 2.11.15	—

Weaknesses

CWE-215

References (8)

https://access.redhat.com/errata/RHSA-2026:21769 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/errata/RHSA-2026:22347 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/errata/RHSA-2026:23345 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/security/cve/CVE-2026-33247 [vdb-entry, x_refsource_REDHAT]
https://advisories.nats.io/CVE/secnote-2026-14.txt [x_refsource_MISC]
https://bugzilla.redhat.com/show_bug.cgi?id=2451486 [issue-tracking, x_refsource_REDHAT]
https://github.com/nats-io/nats-server/security/advisories/GHSA-x6g4-f6q3-fqvv [x_refsource_CONFIRM]
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33247.json [x_sadp-csaf-vex]

Authoritative record: CVE-2026-33247 at cve.org

Vendors: nats-io

Weaknesses: CWE-215

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-33247 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.