CVE-2021-43838
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductJsx-slack
PublishedDec 17, 2021
First seenDec 17, 2021
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- jsx-slack_project jsx-slack4.5.2 or later
- jsx-slack4.5.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| jsx-slack_project jsx-slack | v < 4.5.2 | 4.5.2 |
| jsx-slacknpm | v < 4.5.1 | 4.5.1 |
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