{"id":"CVE-2026-23869","aliases":["CLSA-2026-1786388579","CLSA-2026-1792161470","CLSA-2026-1792161493","CLSA-2026-1792161643","CLSA-2026-1792161658","CLSA-2026-1792251863","CLSA-2026-1792267917","CLSA-2026-1792287260","EUVD-2026-20584","GHSA-479c-33wc-g2pg"],"status":"published","title":"React Server Components have a Denial of Service Vulnerability","description":"A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.The payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01575,"percentile":0.75653,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-400","CWE-502","CWE-770"],"published":"2026-04-08T19:11:08Z","modified":"2026-11-03T13:30:04Z","exploits":[{"source":"pocgithub","id":"yohannslm/CVE-2026-23869","title":"yohannslm/CVE-2026-23869","date":"2026-04-10","url":"https://github.com/yohannslm/CVE-2026-23869"},{"source":"pocgithub","id":"cybertechajju/CVE-2026-23869-Exploit","title":"cybertechajju/CVE-2026-23869-Exploit","date":"2026-04-11","url":"https://github.com/cybertechajju/CVE-2026-23869-Exploit"},{"source":"pocgithub","id":"shaheryar773/mitigate-cve-2026-23869-react-server-component-loops","title":"shaheryar773/mitigate-cve-2026-23869-react-server-component-loops","date":"2026-07-04","url":"https://github.com/shaheryar773/mitigate-cve-2026-23869-react-server-component-loops"}],"fixes":[{"ecosystem":"npm","package":"react-server-dom-parcel","fixed_in":["19.0.5","19.1.6","19.2.5"],"sources":["ghsa","osv"]},{"ecosystem":"npm","package":"react-server-dom-turbopack","fixed_in":["19.0.5","19.1.6","19.2.5"],"sources":["ghsa","osv"]},{"ecosystem":"npm","package":"react-server-dom-webpack","fixed_in":["19.0.5","19.1.6","19.2.5"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"react-server-dom-parcel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.0.0"},{"fixed":"19.0.5"}]}]},{"source":"ghsa","ecosystem":"npm","package":"react-server-dom-parcel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.1.0"},{"fixed":"19.1.6"}]}]},{"source":"ghsa","ecosystem":"npm","package":"react-server-dom-parcel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.2.0"},{"fixed":"19.2.5"}]}]},{"source":"ghsa","ecosystem":"npm","package":"react-server-dom-turbopack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.0.0"},{"fixed":"19.0.5"}]}]},{"source":"ghsa","ecosystem":"npm","package":"react-server-dom-turbopack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.1.0"},{"fixed":"19.1.6"}]}]},{"source":"ghsa","ecosystem":"npm","package":"react-server-dom-turbopack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.2.0"},{"fixed":"19.2.5"}]}]},{"source":"ghsa","ecosystem":"npm","package":"react-server-dom-webpack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.0.0"},{"fixed":"19.0.5"}]}]},{"source":"ghsa","ecosystem":"npm","package":"react-server-dom-webpack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.1.0"},{"fixed":"19.1.6"}]}]},{"source":"ghsa","ecosystem":"npm","package":"react-server-dom-webpack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.2.0"},{"fixed":"19.2.5"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-server-dom-esm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.2.0-tuxcare.0"},{"fixed":"19.2.0-tuxcare.7"}]}],"versions":["19.2.0","19.2.0-tuxcare.1","19.2.0-tuxcare.2","19.2.0-tuxcare.3","19.2.0-tuxcare.4","19.2.0-tuxcare.5","19.2.0-tuxcare.6"],"bundled":4},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-art","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.2.0-tuxcare.0"},{"fixed":"19.2.0-tuxcare.7"}]}],"versions":["19.2.0","19.2.0-tuxcare.5","19.2.0-tuxcare.6"],"bundled":4},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-is","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.2.0-tuxcare.0"},{"fixed":"19.2.0-tuxcare.7"}]}],"versions":["19.2.0","19.2.0-tuxcare.5","19.2.0-tuxcare.6"],"bundled":4},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-server-dom-turbopack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.2.0-tuxcare.0"},{"fixed":"19.2.0-tuxcare.7"}]}],"versions":["19.2.0","19.2.0-tuxcare.5","19.2.0-tuxcare.6"],"bundled":4},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-server-dom-webpack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.2.0-tuxcare.0"},{"fixed":"19.2.0-tuxcare.7"}]}],"versions":["19.2.0","19.2.0-tuxcare.5","19.2.0-tuxcare.6"],"bundled":4},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-server-dom-parcel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.2.0-tuxcare.0"},{"fixed":"19.2.0-tuxcare.7"}]}],"versions":["19.2.0","19.2.0-tuxcare.5","19.2.0-tuxcare.6"],"bundled":4},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-dom","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.2.0-tuxcare.0"},{"fixed":"19.2.0-tuxcare.7"}]}],"versions":["19.2.0","19.2.0-tuxcare.1","19.2.0-tuxcare.2","19.2.0-tuxcare.3","19.2.0-tuxcare.4","19.2.0-tuxcare.5","19.2.0-tuxcare.6"],"bundled":4},{"source":"osv","ecosystem":"TuxCare:npm","package":"react-test-renderer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"19.2.0-tuxcare.0"},{"fixed":"19.2.0-tuxcare.7"}]}],"versions":["19.2.0","19.2.0-tuxcare.5","19.2.0-tuxcare.6"],"bundled":4},{"source":"osv","ecosystem":"npm","package":"react-server-dom-parcel","ranges":[{"type":"SEMVER","events":[{"introduced":"19.0.0"},{"fixed":"19.0.5"}]}]},{"source":"osv","ecosystem":"npm","package":"react-server-dom-parcel","ranges":[{"type":"SEMVER","events":[{"introduced":"19.1.0"},{"fixed":"19.1.6"}]}]},{"source":"osv","ecosystem":"npm","package":"react-server-dom-parcel","ranges":[{"type":"SEMVER","events":[{"introduced":"19.2.0"},{"fixed":"19.2.5"}]}]},{"source":"osv","ecosystem":"npm","package":"react-server-dom-turbopack","ranges":[{"type":"SEMVER","events":[{"introduced":"19.0.0"},{"fixed":"19.0.5"}]}]},{"source":"osv","ecosystem":"npm","package":"react-server-dom-turbopack","ranges":[{"type":"SEMVER","events":[{"introduced":"19.1.0"},{"fixed":"19.1.6"}]}]},{"source":"osv","ecosystem":"npm","package":"react-server-dom-turbopack","ranges":[{"type":"SEMVER","events":[{"introduced":"19.2.0"},{"fixed":"19.2.5"}]}]},{"source":"osv","ecosystem":"npm","package":"react-server-dom-webpack","ranges":[{"type":"SEMVER","events":[{"introduced":"19.0.0"},{"fixed":"19.0.5"}]}]},{"source":"osv","ecosystem":"npm","package":"react-server-dom-webpack","ranges":[{"type":"SEMVER","events":[{"introduced":"19.1.0"},{"fixed":"19.1.6"}]}]},{"source":"osv","ecosystem":"npm","package":"react-server-dom-webpack","ranges":[{"type":"SEMVER","events":[{"introduced":"19.2.0"},{"fixed":"19.2.5"}]}]}],"products":[{"vendor":"meta","product":"react-server-dom-parcel"},{"vendor":"meta","product":"react-server-dom-turbopack"},{"vendor":"meta","product":"react-server-dom-webpack"},{"vendor":"red hat","product":"red hat openshift ai (rhoai)"}],"references":[{"url":"https://github.com/facebook/react/security/advisories/GHSA-479c-33wc-g2pg","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-23869","tags":["vdb-entry","x_refsource_REDHAT","web"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2456663","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23869.json","tags":["x_sadp-csaf-vex","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23869","tags":["advisory"]},{"url":"https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components","tags":["web"]},{"url":"https://github.com/advisories/GHSA-479c-33wc-g2pg"},{"url":"https://github.com/facebook/react","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-23869","description":"A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.The payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.","status":"published","published":"2026-04-08T19:11:08.418Z","modified":"2026-07-15T01:17:57.169Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-502","CWE-400","CWE-770"],"updated_at":"2026-11-02T13:42:15.603999Z"}],"euvd":[{"id":"EUVD-2026-20584","description":"A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.The payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.","status":"published","published":"2026-04-08T19:11:08Z","modified":"2026-07-15T01:17:57Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T18:19:55.318488Z"}],"ghsa":[{"id":"GHSA-479c-33wc-g2pg","title":"React Server Components have a Denial of Service Vulnerability","description":"## Impact\n\nA denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack versions 19.0.0, 19.1.0 and 19.2.0. The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.\n\nThe payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.\n\nWe recommend updating immediately.\n\nThe vulnerability exists in versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4 of:\n\n[react-server-dom-webpack](https://www.npmjs.com/package/react-server-dom-webpack)\n[react-server-dom-parcel](https://www.npmjs.com/package/react-server-dom-parcel)\n[react-server-dom-turbopack](https://www.npmjs.com/package/react-server-dom-turbopack?activeTab=readme)\n\n## Patches\n\nFixes were back ported to versions 19.0.5, 19.1.6, and 19.2.5.\n\nIf you are using any of the above packages please upgrade to any of the fixed versions immediately.\n\nIf your app’s React code does not use a server, your app is not affected by this vulnerability. If your app does not use a framework, bundler, or bundler plugin that supports React Server Components, your app is not affected by this vulnerability.\n\n## References\n\nSee the [blog post](https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components) for more information and upgrade instructions.","status":"published","published":"2026-04-10T15:35:37Z","modified":"2026-04-10T15:35:39Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400","CWE-502"],"updated_at":"2026-11-02T14:39:52.102227Z"}],"nvd":[{"id":"CVE-2026-23869","description":"A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.The payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.","status":"published","published":"2026-04-08T20:16:23.003Z","modified":"2026-07-25T11:10:00.1Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-400","CWE-502","CWE-770"],"updated_at":"2026-11-02T14:12:13.535987Z"}],"osv":[{"id":"CVE-2026-23869","description":"A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.The payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.","status":"published","published":"2026-04-08T20:16:23.003Z","modified":"2026-10-20T11:22:10.057743327Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:59.079784Z"},{"id":"GHSA-479c-33wc-g2pg","title":"React Server Components have a Denial of Service Vulnerability","description":"## Impact\n\nA denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack versions 19.0.0, 19.1.0 and 19.2.0. The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.\n\nThe payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.\n\nWe recommend updating immediately.\n\nThe vulnerability exists in versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4 of:\n\n[react-server-dom-webpack](https://www.npmjs.com/package/react-server-dom-webpack)\n[react-server-dom-parcel](https://www.npmjs.com/package/react-server-dom-parcel)\n[react-server-dom-turbopack](https://www.npmjs.com/package/react-server-dom-turbopack?activeTab=readme)\n\n## Patches\n\nFixes were back ported to versions 19.0.5, 19.1.6, and 19.2.5.\n\nIf you are using any of the above packages please upgrade to any of the fixed versions immediately.\n\nIf your app’s React code does not use a server, your app is not affected by this vulnerability. If your app does not use a framework, bundler, or bundler plugin that supports React Server Components, your app is not affected by this vulnerability.\n\n## References\n\nSee the [blog post](https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components) for more information and upgrade instructions.","status":"published","published":"2026-04-10T15:35:37Z","modified":"2026-04-10T15:57:10.364539Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400","CWE-502"],"updated_at":"2026-11-02T15:46:36.782754Z"},{"id":"CLSA-2026-1786388579","title":"TuxCare security update for react-server-dom-esm (4 CVEs)","description":"TuxCare rebuilt react-server-dom-esm to address 4 CVEs. Fixed in 19.2.0-tuxcare.7.","status":"published","published":"2026-08-10T19:02:59Z","modified":"2026-11-03T13:30:04.023207191Z","updated_at":"2026-11-03T14:04:50.729288Z"},{"id":"CLSA-2026-1792161470","title":"TuxCare security update for react-art (4 CVEs)","description":"TuxCare rebuilt react-art to address 4 CVEs. Fixed in 19.2.0-tuxcare.7.","status":"published","published":"2026-10-16T14:37:50Z","modified":"2026-10-16T16:31:03.071290883Z","updated_at":"2026-11-02T15:43:51.213191Z"},{"id":"CLSA-2026-1792161493","title":"TuxCare security update for react-is (4 CVEs)","description":"TuxCare rebuilt react-is to address 4 CVEs. Fixed in 19.2.0-tuxcare.7.","status":"published","published":"2026-10-16T14:38:12Z","modified":"2026-10-16T16:30:09.029471194Z","updated_at":"2026-11-02T15:43:51.213191Z"},{"id":"CLSA-2026-1792161643","title":"TuxCare security update for react-server-dom-turbopack (4 CVEs)","description":"TuxCare rebuilt react-server-dom-turbopack to address 4 CVEs. Fixed in 19.2.0-tuxcare.7.","status":"published","published":"2026-10-16T14:40:43Z","modified":"2026-10-16T16:31:06.569869751Z","updated_at":"2026-11-02T15:43:51.213191Z"},{"id":"CLSA-2026-1792161658","title":"TuxCare security update for react-server-dom-webpack (4 CVEs)","description":"TuxCare rebuilt react-server-dom-webpack to address 4 CVEs. Fixed in 19.2.0-tuxcare.7.","status":"published","published":"2026-10-16T14:40:58Z","modified":"2026-10-16T16:31:13.847118664Z","updated_at":"2026-11-02T15:43:51.213191Z"},{"id":"CLSA-2026-1792251863","title":"TuxCare security update for react-server-dom-parcel (4 CVEs)","description":"TuxCare rebuilt react-server-dom-parcel to address 4 CVEs. Fixed in 19.2.0-tuxcare.7.","status":"published","published":"2026-10-17T15:44:23Z","modified":"2026-10-17T19:01:40.66657616Z","updated_at":"2026-11-02T15:43:52.011757Z"},{"id":"CLSA-2026-1792267917","title":"TuxCare security update for react-dom (4 CVEs)","description":"TuxCare rebuilt react-dom to address 4 CVEs. Fixed in 19.2.0-tuxcare.7.","status":"published","published":"2026-10-17T20:11:57Z","modified":"2026-10-18T01:30:33.085911948Z","updated_at":"2026-11-02T15:43:52.288832Z"},{"id":"CLSA-2026-1792287260","title":"TuxCare security update for react-test-renderer (4 CVEs)","description":"TuxCare rebuilt react-test-renderer to address 4 CVEs. Fixed in 19.2.0-tuxcare.7.","status":"published","published":"2026-10-18T01:34:18Z","modified":"2026-10-18T07:15:02.816420107Z","updated_at":"2026-11-02T15:43:52.288832Z"}]}}