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CVE-2019-18848

25
FAUCET Score

CVE-2019-18848 describes a vulnerability in the json-jwt gem for Ruby, affecting versions prior to 1.11.0, where it fails to properly count elements when splitting a JWE string. This flaw carries a CVSS score of 7.5 (High) due to its network-based attack vector, low attack complexity, and potential for high integrity impact, though confidentiality and availability are not directly affected. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.11.0CPE matchmatch criteria
cpe:2.3:a:json-jwt_project:json-jwt:*:*:*:*:*:ruby:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.26%
Probability of exploitation in next 30 days
EPSS Percentile
66.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0126 is in the 46th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
rubygemspatch availablevia ghsa
Product: json-jwtFixed in: 1.11.0

Vendor Advisories (1)

rubygemsGHSA-cff7-6h4q-q5pjhigh

JSON-jwt Gem lacked element count during splitting of JWE string

Nov 14, 2019

References

github.com / nov/json-jwt/commit/ada16e772906efdd035e3df49cb2ae372f0f948a
Patch
github.com / nov/json-jwt/compare/v1.10.2...v1.11.0
Patch
lists.debian.org / debian-lts-announce/2020/10/msg00001.html
Mailing ListThird Party Advisory