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Fencer Vulns
critical 9.8

CVE-2020-26892 json

Incorrect handling of credential expiry by /nats-io/nats-server

published 2020-11-06 6 y ago modified 2026-09-10 1 mo ago also GHSA-2c64-vj8g-vwrq , GHSA-4w5x-x539-ppf5 , GO-2022-0380 , EUVD-2022-0821

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

The JWT library in NATS nats-server before 2.1.9 has Incorrect Access Control because of how expired credentials are handled.

Patch / fix

  • go github.com/nats-io/jwt 1.1.0
  • go github.com/nats-io/nats-server/v2 2.1.9
  • linuxfoundation nats-server 2.1.9
  • golang-github-nats-io-jwt Debian 14, Debian 13, Debian 12 2.2.0-1

debian advisories DEBIAN-CVE-2020-26892

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-26892 updated cvss 7.3

nats-server: Incorrect Access Control because of how expired credentials are handled

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.33% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
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

Classification

Weakness
  • CWE-798 Use of Hard-coded Credentials
  • CWE-284 Improper Access Control

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.