CVE-2026-27571

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

CVE-2026-27571 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-27571, released February 24, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0054

46th percentile

GO-2026-4533 GHSA-qrvq-68c2-7grw

Where it's fixed

Product	Fixed in	Fix	Released
Linux
govulncheck-vulndb · opensuse-leap 15.6	0.0.20260226T182644-150000.1.149.1	SUSE-SU-2026:0757-1	Mar 3, 2026
govulncheck-vulndb · opensuse-leap 16.0	0.0.20260723T184607-160000.1.1	OPENSUSE-SU-2026:21483-1	Jul 30, 2026
nats-server · Debian 14	2.12.4-1	DEBIAN-CVE-2026-27571	Feb 24, 2026

Details

Published
February 24, 2026
Weakness
Improper Handling of Highly Compressed Data (Data Amplification)
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27571

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