PT-2019-15698 · Ruby · Json-Jwt

Nov · Published 2019-11-12 · Updated 2025-01-07 · CVE-2019-18848

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions json-jwt gem versions prior to 1.11.0

Description The issue is related to the json-jwt gem for Ruby, where it lacks an element count during the splitting of a JWE string. This lack of element count can lead to potential security issues.

Recommendations For versions prior to 1.11.0, update to version 1.11.0 or later to resolve the issue. As a temporary workaround, consider restricting the use of JWE strings until the update is applied.

Exploit

Fix

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

CVE-2019-18848

DLA-2390-1

GHSA-CFF7-6H4Q-Q5PJ

OPENSUSE-SU-2025:0004-1

Affected Products

Json-Jwt

References · 25

• 🔥 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/json-jwt/CVE-2019-18848.yml · Exploit
• https://github.com/nov/json-jwt/commit/ada16e772906efdd035e3df49cb2ae372f0f948a · Patch
• https://github.com/nov/json-jwt/compare/v1.10.2...v1.11.0 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-18848 · Vendor Advisory
• https://security-tracker.debian.org/tracker/DLA-2390-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-18848 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2019-18848 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:0004-1 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-cff7-6h4q-q5pj · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2019-18848 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-18848 · Vendor Advisory
• https://security-tracker.debian.org/tracker/source-package/ruby-json-jwt · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2019-18848 · Security Note
• https://osv.dev/vulnerability/DLA-2390-1 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18848 · Security Note