CVE-2020-26521
unknown
CVSS v3
—
CVSS v4 NEW
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VIR risk
—
Description
The JWT library in NATS nats-server before 2.1.9 allows a denial of service (a nil dereference in Go code).
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 2.2.0-1 |
| debian | forky | fixed | 2.2.0-1 |
| debian | sid | fixed | 2.2.0-1 |
| debian | trixie | fixed | 2.2.0-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | github.com/nats-io/jwt | <1.1.0 | 1.1.0 |
| Go | github.com/nats-io/nats-server/v2 | <2.1.9 | 2.1.9 |
References
- https://github.com/nats-io/jwt/security/advisories/GHSA-h2fg-54x9-5qhq
- https://nvd.nist.gov/vuln/detail/CVE-2020-26521
- https://github.com/nats-io/jwt/pull/107
- https://github.com/nats-io/nats-server/commit/9ff8bcde2e46009e98bd9e88f598af355f62c168
- https://advisories.nats.io/CVE/CVE-2020-26521.txt
- https://github.com/nats-io/jwt
- https://github.com/nats-io/nats-server/commits/master
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VT67XCLIIBYRT762SVFBYFFTQFVSM3SI
- https://pkg.go.dev/vuln/GO-2022-0402
- http://www.openwall.com/lists/oss-security/2020/11/02/2
- https://github.com/nats-io/nats-server/security/advisories/GHSA-hmm9-r2m2-qg9w
- https://github.com/nats-io/nats-server
- https://www.openwall.com/lists/oss-security/2020/11/02/2
- https://security-tracker.debian.org/tracker/CVE-2020-26521
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.