Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Jsx-Slack Project | Jsx-Slack | < 4.5.2 |
Related Weaknesses (CWE)
References
- https://github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c706PatchThird Party Advisory
- https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248qExploitPatchThird Party Advisory
- https://github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c706PatchThird Party Advisory
- https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248qExploitPatchThird Party Advisory
FAQ
What is CVE-2021-43838?
CVE-2021-43838 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 att...
How severe is CVE-2021-43838?
CVE-2021-43838 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-43838?
Check the references section above for vendor advisories and patch information. Affected products include: Jsx-Slack Project Jsx-Slack.