CVE-2021-43838CWE-400

Regular Expression Denial of Service (ReDoS) in jsx-slack

Medium · published December 17, 2021

CVSS v3.1
5.3
EPSS
1%
Percentile
72.7
In the wild
Unconfirmed
What it is

jsx-slack is a library for building JSON objects for Slack Block Kit surfaces from JSX. In versions prior to 4.5.1 users are vulnerable to a regular expression denial-of-service (ReDoS) attack. If attacker can put a lot of JSX elements into `<blockquote>` tag, an internal regular expression for escaping characters may consume an excessive amount of computing resources. jsx-slack v4.5.1 has patched to a regex for escaping blockquote characters. Users are advised to upgrade as soon as possible.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.01422 · 72.7th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2021-12-17T18:20Z
EPSS history
Timeline
  • 17 DEC 18:20Z
    Regular Expression Denial of Service (ReDoS) in jsx-slack
    cvelistv5