Resource exhaustion in Jsx-Slack Project
CVE-2021-43838
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.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.014 (69.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Jsx-slack_project Jsx-slack
- Yhatt Jsx-slack — versions < 4.5.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-43838?
- CVE-2021-43838 is a medium-severity vulnerability in Jsx-Slack Project, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2021-12-17.
- How severe is CVE-2021-43838?
- Medium severity. CVSS v3 base score is 5.3 out of 10.