CVE-2018-1000539

Severity: medium (CVSS 5.3 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-06-26 · updated 2026-06-17
Weakness: CWE-347

Description

Nov json-jwt version >= 0.5.0 && < 1.9.4 contains a CWE-347: Improper Verification of Cryptographic Signature vulnerability in Decryption of AES-GCM encrypted JSON Web Tokens that can result in Attacker can forge a authentication tag. This attack appear to be exploitable via network connectivity. This vulnerability appears to have been fixed in 1.9.4 and later.

Affected products

Json-Jwt Project Json-Jwt: from 0.5.0 before 1.9.4 — fixed in 1.9.4

How to fix

Upgrade to a fixed version: Json-Jwt Project Json-Jwt 1.9.4. Check the vendor advisory for mitigations.

References

https://github.com/nov/json-jwt/pull/62
https://www.debian.org/security/2018/dsa-4283
https://github.com/nov/json-jwt/pull/62
https://www.debian.org/security/2018/dsa-4283

Get alerted when CVE-2018-1000539 or the next vulnerability affects your stack