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Vulnerability record · CVE-2020-26521 · published 6 November 2020

CVE-2020-26521: Linuxfoundation nats-server null pointer dereference vulnerability

Linuxfoundation · Nats Server

The JWT library in NATS nats-server before 2.1.9 allows a denial of service (a nil dereference in Go code).

7.5 CVSS 3.1 High EPSS 2.2% · top 18.4% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score, v2 5.0
2.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

The JWT library in NATS nats-server before 2.1.9 allows a denial of service (a nil dereference in Go code).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2020/11/02/2 Mailing ListThird Party Advisory
https://github.com/nats-io/nats-server/commits/master PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VT67XCLIIBYRT762SVFBYFF
http://www.openwall.com/lists/oss-security/2020/11/02/2 Mailing ListThird Party Advisory
https://github.com/nats-io/nats-server/commits/master PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VT67XCLIIBYRT762SVFBYFF

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Source: NIST National Vulnerability Database (record CVE-2020-26521), CISA KEV, FIRST EPSS (scores of 2026-10-08). This page is refreshed as NVD updates the record.