cvedb.io
CVE-2021-43838
MEDIUM · CVSS 5.3
EPSS exploitation probability: 0%
Published 2021-12-17T19:15:07.683 · Last modified 2026-06-17T04:11:32.663

Summary

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.

Affected products

jsx-slack_project — jsx-slack

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.