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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.014 (71.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
- Jsx-Slack Project
- Yhatt Jsx-Slack — versions < 4.5.1
Weakness classification (CWE)
References
- github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q (Exploit, Patch, Third Party Advisory)
- github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c7065d (Patch, Third Party Advisory)
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.