{"id":"CVE-2021-43838","details":"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 `\u003cblockquote\u003e` 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.","aliases":["GHSA-55xv-f85c-248q"],"modified":"2026-07-09T10:11:52.884820Z","published":"2021-12-17T19:15:07.683Z","references":[{"type":"FIX","url":"https://github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c7065d"},{"type":"FIX","url":"https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/yhatt/jsx-slack","events":[{"introduced":"0"},{"fixed":"2fc5567b48bf8cbb8e9902c09e2b5a56f4068e19"},{"fixed":"36e4a10405e4c7745333e245fcc5029c02c7065d"}],"database_specific":{"cpe":"cpe:2.3:a:jsx-slack_project:jsx-slack:*:*:*:*:*:node.js:*:*","extracted_events":[{"introduced":"0"},{"fixed":"4.5.2"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["v4.5.1","v4.5.0","v4.4.3","v4.4.2","v4.4.1","v4.4.0","v4.3.0","v4.2.1","v4.2.0","v4.1.0","v4.0.0","v3.0.0","v2.6.0","v2.5.1","v2.5.0","v2.4.0","v2.3.0","v2.2.1","v2.2.0","v2.1.0","v2.0.0","v1.7.0","v1.6.0","v1.5.1","v1.5.0","v1.4.0","v1.3.1","v1.3.0","v1.2.0","v1.1.0","v1.0.0","v0.12.0","v0.11.1","v0.11.0","v0.10.2","v0.10.1","v0.10.0","v0.9.2","v0.9.1","v0.9.0","v0.8.1","v0.8.0","v0.7.0","v0.6.0","v0.5.1","v0.5.0","v0.4.3","v0.4.2","v0.4.1","v0.4.0","v0.3.0","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43838.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}