{"url":"http://public2.vulnerablecode.io/api/packages/228556?format=json","purl":"pkg:npm/%40ckeditor/ckeditor5-markdown-gfm@11.0.4","type":"npm","namespace":"@ckeditor","name":"ckeditor5-markdown-gfm","version":"11.0.4","qualifiers":{},"subpath":"","is_vulnerable":true,"next_non_vulnerable_version":"35.0.1","latest_non_vulnerable_version":"35.0.1","affected_by_vulnerabilities":[{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/36269?format=json","vulnerability_id":"VCID-r4vp-zkkv-jfex","summary":"CKEditor 5 Markdown plugin Regular expression Denial of Service\n### Impact\nA regular expression denial of service (ReDoS) vulnerability has been discovered in the CKEditor 5 Markdown plugin code. The vulnerability allowed to abuse a link recognition regular expression, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 Markdown plugin at version <= 24.0.0. \n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version 25.0.0.\n\n### Workarounds\nThe user can work around the issue by:\n- Upgrading CKEditor 5 to version 25.0.0.\n- Disabling the Markdown plugin.\n\n### More information\nIf you have any questions or comments about this advisory:\n* Email us at [security@cksource.com](mailto:security@cksource.com)\n\n### Acknowledgements\nThe CKEditor 5 team would like to thank Erik Krogh Kristensen from the GitHub team for recognizing this vulnerability and \nAlvaro Muñoz from GitHub for reporting it.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-21254","reference_id":"","reference_type":"","scores":[{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61004","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.60982","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.6103","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61046","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61067","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61053","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61033","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61074","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.6108","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61063","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.6105","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61062","published_at":"2026-04-26T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61054","published_at":"2026-05-07T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.60911","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.60988","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00405","scoring_system":"epss","scoring_elements":"0.61017","published_at":"2026-04-04T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-21254"},{"reference_url":"https://github.com/ckeditor/ckeditor5","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor5"},{"reference_url":"https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0"},{"reference_url":"https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21254","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21254"},{"reference_url":"https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm"},{"reference_url":"https://github.com/advisories/GHSA-hgmg-hhc8-g5wr","reference_id":"GHSA-hgmg-hhc8-g5wr","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-hgmg-hhc8-g5wr"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/74344?format=json","purl":"pkg:npm/%40ckeditor/ckeditor5-markdown-gfm@25.0.0","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-wpgs-aj5v-zbbw"},{"vulnerability":"VCID-y831-gekf-cqh6"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/%2540ckeditor/ckeditor5-markdown-gfm@25.0.0"}],"aliases":["CVE-2021-21254","GHSA-hgmg-hhc8-g5wr"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-r4vp-zkkv-jfex"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/53151?format=json","vulnerability_id":"VCID-wpgs-aj5v-zbbw","summary":"CKEditor5 cross-site scripting vulnerability caused by the editor instance destroying process\n### Affected packages\n@ckeditor/ckeditor5-markdown-gfm\n@ckeditor/ckeditor5-html-support\n@ckeditor/ckeditor5-html-embed\n\n### Impact\nA cross-site scripting vulnerability has been discovered affecting three optional CKEditor 5's packages. The vulnerability allowed to trigger a JavaScript code after fulfilling special conditions:\n\na) Using one of the affected packages. In case of `ckeditor5-html-support` and `ckeditor5-html-embed`, additionally, it was required to use a configuration that allows unsafe markup inside the editor,\nb) Initializing the editor on an element and using an element other than `<textarea>` as a base,\nc) Destroying the editor instance.\n\nThe root cause of the issue was a mechanism responsible for updating the source element with the markup coming from the CKEditor 5 data pipeline after destroying the editor. \n\nThis vulnerability might affect a small percent of integrators that depend on dynamic editor initialization/destroy and use [Markdown](https://ckeditor.com/docs/ckeditor5/latest/features/markdown.html), [General HTML Support](https://ckeditor.com/docs/ckeditor5/latest/features/general-html-support.html) or [HTML embed](https://ckeditor.com/docs/ckeditor5/latest/features/html-embed.html) features.\n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version 35.0.1.\n\n### For more information\nEmail us at [security@cksource.com](mailto:security@cksource.com) if you have any questions or comments about this advisory.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2022-31175","reference_id":"","reference_type":"","scores":[{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73003","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73167","published_at":"2026-05-07T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73141","published_at":"2026-05-05T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73147","published_at":"2026-04-29T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73134","published_at":"2026-04-24T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73097","published_at":"2026-04-21T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.7304","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73028","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73103","published_at":"2026-04-18T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73094","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73051","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73057","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73078","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73053","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00746","scoring_system":"epss","scoring_elements":"0.73007","published_at":"2026-04-02T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2022-31175"},{"reference_url":"https://ckeditor.com/docs/ckeditor5/latest/features/general-html-support.html","reference_id":"","reference_type":"","scores":[{"value":"5.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-23T14:02:28Z/"}],"url":"https://ckeditor.com/docs/ckeditor5/latest/features/general-html-support.html"},{"reference_url":"https://ckeditor.com/docs/ckeditor5/latest/features/html-embed.html","reference_id":"","reference_type":"","scores":[{"value":"5.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-23T14:02:28Z/"}],"url":"https://ckeditor.com/docs/ckeditor5/latest/features/html-embed.html"},{"reference_url":"https://ckeditor.com/docs/ckeditor5/latest/features/markdown.html","reference_id":"","reference_type":"","scores":[{"value":"5.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-23T14:02:28Z/"}],"url":"https://ckeditor.com/docs/ckeditor5/latest/features/markdown.html"},{"reference_url":"https://github.com/ckeditor/ckeditor5","reference_id":"","reference_type":"","scores":[{"value":"5.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor5"},{"reference_url":"https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-42wq-rch8-6f6j","reference_id":"","reference_type":"","scores":[{"value":"5.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-23T14:02:28Z/"}],"url":"https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-42wq-rch8-6f6j"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2022-31175","reference_id":"","reference_type":"","scores":[{"value":"5.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-31175"},{"reference_url":"https://github.com/advisories/GHSA-42wq-rch8-6f6j","reference_id":"GHSA-42wq-rch8-6f6j","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://gith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expression Denial of Service in multiple packages\n### Impact\nA regular expression denial of service (ReDoS) vulnerability has been discovered in multiple CKEditor 5 packages. The vulnerability allowed to abuse particular regular expressions, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 packages listed above at version <= 26.0.0.\n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version 27.0.0.\n\n### For more information\nEmail us at security@cksource.com if you have any questions or comments about this advisory.\n\n### Acknowledgements\nThe CKEditor 5 team would like to thank Yeting Li for recognizing and reporting these vulnerabilities.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-21391","reference_id":"","reference_type":"","scores":[{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92226","published_at":"2026-04-01T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92293","published_at":"2026-05-07T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92284","published_at":"2026-05-05T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92273","published_at":"2026-04-29T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92241","published_at":"2026-04-07T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92238","published_at":"2026-04-04T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92233","published_at":"2026-04-02T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92278","published_at":"2026-04-26T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92277","published_at":"2026-04-24T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92271","published_at":"2026-04-18T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92272","published_at":"2026-04-21T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.9226","published_at":"2026-04-13T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92263","published_at":"2026-04-12T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92262","published_at":"2026-04-11T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92256","published_at":"2026-04-09T12:55:00Z"},{"value":"0.08303","scoring_system":"epss","scoring_elements":"0.92252","published_at":"2026-04-08T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-21391"},{"reference_url":"https://github.com/ckeditor/ckeditor5/releases/tag/v27.0.0","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor5/releases/tag/v27.0.0"},{"reference_url":"https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-3rh3-wfr4-76mj","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-3rh3-wfr4-76mj"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21391","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21391"},{"reference_url":"https://www.npmjs.com/package/@ckeditor/ckeditor5-engine","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.npmjs.com/package/@ckeditor/ckeditor5-engine"},{"reference_url":"https://www.npmjs.com/package/@ckeditor/ckeditor5-font","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.npmjs.com/package/@ckeditor/ckeditor5-font"},{"reference_url":"https://www.npmjs.com/package/@ckeditor/ckeditor5-image","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.npmjs.com/package/@ckeditor/ckeditor5-image"},{"reference_url":"https://www.npmjs.com/package/@ckeditor/ckeditor5-list","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://www.npmjs.com/package/@ckeditor/ckeditor5-list"},{"reference_url":"https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm","reference_id":"","reference_type":"","scores":[{"value":"6.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"value":"MODERATE","sc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