High severity7.5NVD Advisory· Published Nov 6, 2020· Updated Jun 17, 2026
CVE-2020-26521
CVE-2020-26521
Description
The JWT library in NATS nats-server before 2.1.9 allows a denial of service (a nil dereference in Go code).
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/nats-io/jwtGo | < 1.1.0 | 1.1.0 |
Affected products
6- NATS/nats-serverdescription
- osv-coords5 versionspkg:apk/chainguard/nats-serverpkg:apk/chainguard/nats-server-compatpkg:apk/wolfi/nats-serverpkg:apk/wolfi/nats-server-compatpkg:golang/github.com/nats-io/jwt
< 0+ 4 more
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 1.1.0
Patches
Vulnerability mechanics
References
11- github.com/nats-io/nats-server/commits/masternvdPatchThird Party AdvisoryWEB
- www.openwall.com/lists/oss-security/2020/11/02/2nvdMailing ListThird Party AdvisoryWEB
- github.com/advisories/GHSA-h2fg-54x9-5qhqghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2020-26521ghsaADVISORY
- advisories.nats.io/CVE/CVE-2020-26521.txtghsaWEB
- github.com/nats-io/jwt/pull/107ghsaWEB
- github.com/nats-io/jwt/security/advisories/GHSA-h2fg-54x9-5qhqghsaWEB
- github.com/nats-io/nats-server/commit/9ff8bcde2e46009e98bd9e88f598af355f62c168ghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VT67XCLIIBYRT762SVFBYFFTQFVSM3SIghsaWEB
- pkg.go.dev/vuln/GO-2022-0402ghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VT67XCLIIBYRT762SVFBYFFTQFVSM3SI/nvd
News mentions
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