{"url":"http://public2.vulnerablecode.io/api/packages/548869?format=json","purl":"pkg:npm/jsx-slack@4.2.0","type":"npm","namespace":"","name":"jsx-slack","version":"4.2.0","qualifiers":{},"subpath":"","is_vulnerable":true,"next_non_vulnerable_version":"4.5.2","latest_non_vulnerable_version":"4.5.2","affected_by_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/41920?format=json","vulnerability_id":"VCID-q9t2-aqgm-gyh2","summary":"Uncontrolled Resource Consumption\njsx-slack is a package for building JSON objects for Slack block kit surfaces from JSX. The maintainers found the patch for CVE-2021-43838 in jsx-slack v4.5.1 is insufficient tfor protection from a Regular Expression Denial of Service (ReDoS) attack. If an attacker can put a lot of JSX elements into `<blockquote>` tag _with including multibyte characters_, an internal regular expression for escaping characters may consume an excessive amount of computing resources. v4.5.1 passes the test against ASCII characters but misses the case of multibyte characters. jsx-slack v4.5.2 has updated regular expressions for escaping blockquote characters to prevent catastrophic backtracking. It is also including an updated test case to confirm rendering multiple tags in `<blockquote>` with multibyte characters.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-43843","reference_id":"","reference_type":"","scores":[{"value":"0.00563","scoring_system":"epss","scoring_elements":"0.68718","published_at":"2026-06-04T12:55:00Z"},{"value":"0.00563","scoring_system":"epss","scoring_elements":"0.68763","published_at":"2026-06-09T12:55:00Z"},{"value":"0.00563","scoring_system":"epss","scoring_elements":"0.68743","published_at":"2026-06-08T12:55:00Z"},{"value":"0.00563","scoring_system":"epss","scoring_elements":"0.68767","published_at":"2026-06-06T12:55:00Z"},{"value":"0.00563","scoring_system":"epss","scoring_elements":"0.68759","published_at":"2026-06-07T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-43843"},{"reference_url":"https://github.com/yhatt/jsx-slack/commit/46bc88391d89d5fda4ce689e18ca080bcdd29ecc","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/yhatt/jsx-slack/commit/46bc88391d89d5fda4ce689e18ca080bcdd29ecc"},{"reference_url":"https://github.com/yhatt/jsx-slack/releases/tag/v4.5.2","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/yhatt/jsx-slack/releases/tag/v4.5.2"},{"reference_url":"https://github.com/yhatt/jsx-slack/security","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/yhatt/jsx-slack/security"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43843","reference_id":"CVE-2021-43843","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43843"},{"reference_url":"https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q","reference_id":"GHSA-55xv-f85c-248q","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q"},{"reference_url":"https://github.com/advisories/GHSA-hp68-xhvj-x6j6","reference_id":"GHSA-hp68-xhvj-x6j6","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-hp68-xhvj-x6j6"},{"reference_url":"https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6","reference_id":"GHSA-hp68-xhvj-x6j6","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/yhatt/jsx-slack/security/advisories/GHSA-hp68-xhvj-x6j6"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/59866?format=json","purl":"pkg:npm/jsx-slack@4.5.2","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/jsx-slack@4.5.2"}],"aliases":["CVE-2021-43843","GHSA-hp68-xhvj-x6j6"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-q9t2-aqgm-gyh2"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/41904?format=json","vulnerability_id":"VCID-thhx-7p2u-nfc2","summary":"Uncontrolled Resource Consumption\njsx-slack is a library for building JSON objects for Slack Block Kit surfaces from JSX. users is 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.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-43838","reference_id":"","reference_type":"","scores":[{"value":"0.00334","scoring_system":"epss","scoring_elements":"0.56601","published_at":"2026-06-09T12:55:00Z"},{"value":"0.00334","scoring_system":"epss","scoring_elements":"0.5655","published_at":"2026-06-04T12:55:00Z"},{"value":"0.00334","scoring_system":"epss","scoring_elements":"0.56603","published_at":"2026-06-05T12:55:00Z"},{"value":"0.00334","scoring_system":"epss","scoring_elements":"0.56609","published_at":"2026-06-06T12:55:00Z"},{"value":"0.00334","scoring_system":"epss","scoring_elements":"0.56598","published_at":"2026-06-07T12:55:00Z"},{"value":"0.00334","scoring_system":"epss","scoring_elements":"0.56583","published_at":"2026-06-08T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-43838"},{"reference_url":"https://github.com/yhatt/jsx-slack","reference_id":"","reference_type":"","scores":[{"value":"3.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/yhatt/jsx-slack"},{"reference_url":"https://github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c7065d","reference_id":"","reference_type":"","scores":[{"value":"3.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/yhatt/jsx-slack/commit/36e4a10405e4c7745333e245fcc5029c02c7065d"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43838","reference_id":"CVE-2021-43838","reference_type":"","scores":[{"value":"3.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43838"},{"reference_url":"https://github.com/advisories/GHSA-55xv-f85c-248q","reference_id":"GHSA-55xv-f85c-248q","reference_type":"","scores":[{"value":"LOW","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-55xv-f85c-248q"},{"reference_url":"https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q","reference_id":"GHSA-55xv-f85c-248q","reference_type":"","scores":[{"value":"3.7","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"LOW","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"LOW","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/yhatt/jsx-slack/security/advisories/GHSA-55xv-f85c-248q"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/141246?format=json","purl":"pkg:npm/jsx-slack@4.5.1","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-q9t2-aqgm-gyh2"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/jsx-slack@4.5.1"},{"url":"http://public2.vulnerablecode.io/api/packages/59866?format=json","purl":"pkg:npm/jsx-slack@4.5.2","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/jsx-slack@4.5.2"}],"aliases":["CVE-2021-43838","GHSA-55xv-f85c-248q"],"risk_score":1.6,"exploitability":"0.5","weighted_severity":"3.3","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-thhx-7p2u-nfc2"}],"fixing_vulnerabilities":[],"risk_score":"3.1","resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/jsx-slack@4.2.0"}