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

CVE-2020-26521

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

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

HIGH · CVSS 7.5 EPSS 0.00682
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-476NULL Pointer Dereference
▤

Affected Products & Versions

2
linuxfoundation nats-server< 2.1.9
fedoraproject fedoraall versions
▤

Affected Packages

2
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go github.com/nats-io/jwt HIGH fixed in 1.1.0
Go github.com/nats-io/nats-server/v2 HIGH fixed in 2.1.9
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD06 Nov 2020 · 08:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2020/11/02/2Mailing ListThird Party Advisory
https://github.com/nats-io/nats-server/commits/masterPatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VT67XCLIIBYRT762SVFBYFFTQFVSM3SI/
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