{"id":"CVE-2021-43838","state":"PUBLISHED","title":"Regular Expression Denial of Service (ReDoS) in jsx-slack","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.","publishedAt":"2021-12-17T18:20:11.000Z","updatedAt":"2024-08-04T04:10:16.268Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["yhatt jsx-slack"],"affected":[{"vendor":"yhatt","product":"jsx-slack","versions":[{"version":"< 4.5.1","status":"affected"}]}],"references":["https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q","https://github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c7065d"],"weaknesses":["CWE-400"],"ingestedAt":"2026-10-29T19:49:07.642Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/43xxx/CVE-2021-43838.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-43838","state":"PUBLISHED","datePublished":"2021-12-17T18:20:11.000Z","dateUpdated":"2024-08-04T04:10:16.268Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2021-11-16T00:00:00.000Z"},"containers":{"cna":{"title":"Regular Expression Denial of Service (ReDoS) in jsx-slack","descriptions":[{"lang":"en","value":"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":[{"vendor":"yhatt","product":"jsx-slack","versions":[{"version":"< 4.5.1","status":"affected"}]}],"references":[{"url":"https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c7065d","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","dateUpdated":"2021-12-17T18:20:11.000Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa"},"source":{"advisory":"GHSA-55xv-f85c-248q","discovery":"UNKNOWN"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-43838","STATE":"PUBLIC","TITLE":"Regular Expression Denial of Service (ReDoS) in jsx-slack"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"jsx-slack","version":{"version_data":[{"version_value":"< 4.5.1"}]}}]},"vendor_name":"yhatt"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-400: Uncontrolled Resource Consumption"}]}]},"references":{"reference_data":[{"name":"https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q","refsource":"CONFIRM","url":"https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q"},{"name":"https://github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c7065d","refsource":"MISC","url":"https://github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c7065d"}]},"source":{"advisory":"GHSA-55xv-f85c-248q","discovery":"UNKNOWN"}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c7065d","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T04:10:16.268Z"}}]}}}