AUGUST 4, 2026
Live Feed
Back to database
Case File

CVE-2021-43838

MEDIUM · CVSS 5.3 EPSS 1.38% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-12-17 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗ github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-43838
Severity
MEDIUM
CVSS
5.3
EPSS
1.38%

Original NVD Description

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.