The JWT library in NATS nats-server before 2.1.9 has Incorrect Access Control because of…
Priority MEDIUM 47CWE-798Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-798.
Summary
The JWT library in NATS nats-server before 2.1.9 has Incorrect Access Control because of how expired credentials are handled.
Why it matters now
EPSS 0.02328 83rd percentileScored 2026-11-07
Fix Fixed github.com/nats-io/jwt (Go): 1.1.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | github.com/nats-io/jwt (Go) | before 1.1.0 | 1.1.0 | Patch available | GHSA-4w5x-x539-ppf5 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- github.com/nats-io/jwt (Go) Vendor— Affected before 1.1.0 Fixed in 1.1.0 Patch available GHSA-4w5x-x539-ppf5
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:* | before 2.1.9 | Vulnerable | backstage |
| cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | 33 | Vulnerable | Fedoraproject |
- cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:* Versions before 2.1.9 Vulnerable ·backstage
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
Remediation
- Fix · GHSA-4w5x-x539-ppf5 github.com/nats-io/jwt (Go) Fixed in 1.1.0 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2020-26892
- 2026-10-03 Alias added: GHSA-4w5x-x539-ppf5
References
Advisory 3
Other 7
- https://github.com/nats-io/jwt/security/advisories/GHSA-4w5x-x539-ppf5
- https://github.com/nats-io/jwt/commit/e11ce317263cef69619fc1ca743b195d02aa1d8a
- https://github.com/nats-io/nats-server/commit/1e08b67f08e18cd844dce833a265aaa72500a12f
- https://advisories.nats.io/CVE/CVE-2020-26892.txt
- https://github.com/nats-io/jwt
- https://lists.fedoraproject.org/archives/list/[email protected]/message/VT67XCLIIBYRT762SVFBYFFTQFVSM3SI
- https://pkg.go.dev/vuln/GO-2022-0380
Sources
- CVE-2020-26892 · CVE Program
- CVE-2020-26892 · NVD
- FIRST EPSS
- GHSA-4w5x-x539-ppf5 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-26892 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences