GHSA-qrvq-68c2-7grwPublished

nats-server websockets are vulnerable to pre-auth memory DoS

cve-program · CVE-2026-27571

Published

nats-server

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "nats-io",
                    "product": "nats-server",
                    "versions": [
                        {
                            "version": "< 2.11.12",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2.12.0-RC.1, < 2.12.3",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-8538

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Feb 24, 2026, 3:59:17 PM

dateUpdated: Feb 26, 2026, 9:33:40 PM

4 related source bulletins · separate from aliases

msrc_CVE-2026-27571: nats-server websockets are vulnerable to pre-auth memory DoS

CVE-2026-27571

RHSA-2026:5110: Red Hat Security Advisory: Multicluster Global Hub 1.5.4 security update

CVE-2025-61726 · CVE-2025-61728 · CVE-2025-61729 · CVE-2025-68121 · CVE-2026-25679 · CVE-2026-27137 · CVE-2026-27571

RHSA-2026:6226: Red Hat Security Advisory: Multicluster Global Hub 1.6.2 security update

CVE-2025-47907 · CVE-2025-57810 · CVE-2025-58183 · CVE-2025-58754 · CVE-2025-59343 · CVE-2025-61726 · CVE-2025-61728 · CVE-2025-61729 · CVE-2025-68121 · CVE-2026-27571

WID-SEC-W-2026-0487: NATS Server: Schwachstelle ermöglicht Denial of Service

CVE-2026-27571

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2026-27571

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-409 · CWE-770

Original publisher date fields

published: 2026-02-24T17:29:03.393

lastModified: 2026-06-17T10:27:19.650

1 source CPE criteria · context only

cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GHSA-qrvq-68c2-7grw

Published

github.com/nats-io/nats-server/v2

SEMVER · introduced 0 → fixed 2.11.12

github.com/nats-io/nats-server/v2

SEMVER · introduced 2.12.0-RC.1 → fixed 2.12.3

github.com/nats-io/nats-server

SEMVER · introduced 0 → last_affected 1.4.1

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GO-2026-4533

Published

github.com/nats-io/nats-server

SEMVER · introduced 0

github.com/nats-io/nats-server/v2

SEMVER · introduced 0 → fixed 2.11.12 → introduced 2.12.0-RC.1 → fixed 2.12.3

Original source record · Cite this exact observation · Complete original publisher JSON