A time-sensitive equality check on the JWT signature in the JsonWebToken.validate method…
Priority MEDIUM 46Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub.
Summary
A time-sensitive equality check on the JWT signature in the JsonWebToken.validate method in main/scala/authentikat/jwt/JsonWebToken.scala in authentikat-jwt (aka com.jason-goodwin/authentikat-jwt) version 0.4.5 and earlier allows the supplier of a JWT token to guess bit after bit of the signature by repeating validation requests.
Why it matters now
EPSS 0.01963 80th percentileScored 2026-11-07
Fix Fixed com.jason-goodwin:authentikat-jwt_2.12 (Maven): 0.4.6
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 |
| — | com.jason-goodwin:authentikat-jwt_2.12 (Maven) | before 0.4.6 | 0.4.6 | Patch available | GHSA-3rhm-67j6-42jq |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- com.jason-goodwin:authentikat-jwt_2.12 (Maven) Vendor— Affected before 0.4.6 Fixed in 0.4.6 Patch available GHSA-3rhm-67j6-42jq
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:authentikat-jwt_project:authentikat-jwt:*:*:*:*:*:*:*:* | up to 0.4.5 | Vulnerable | Authentikat-jwt Project |
- cpe:2.3:a:authentikat-jwt_project:authentikat-jwt:*:*:*:*:*:*:*:* Versions up to 0.4.5 Vulnerable ·Authentikat-jwt Project
Remediation
- Fix · GHSA-3rhm-67j6-42jq com.jason-goodwin:authentikat-jwt_2.12 (Maven) Fixed in 0.4.6 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2017-18239
- 2026-10-03 Alias added: GHSA-3rhm-67j6-42jq
References
Patch 1
Advisory 4
Sources
- CVE-2017-18239 · CVE Program
- CVE-2017-18239 · NVD
- FIRST EPSS
- GHSA-3rhm-67j6-42jq · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences