{"answers":{"affected":"18 open source packages ship an affected version, including react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack. It affects 3 products.","exploited":"There is no known exploitation of CVE-2026-23870 in the wild and no public exploit code.","fix":"Upgrade react-server-dom-parcel to a fixed version for your release line: 19.0.6, 19.1.7 or 19.2.6.","what":"CVE-2026-23870 is a high-severity denial of service vulnerability in Meta react-server-dom-parcel, published on 6 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-23870 and fix it if it is affected.\n\nWhat it is: CVE-2026-23870 is a high-severity denial of service vulnerability in Meta react-server-dom-parcel, published on 6 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-23870 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- react-server-dom-parcel (npm): affected from 19.0.0; fixed in 19.0.6\n- react-server-dom-parcel (npm): affected from 19.0.0; fixed in 19.0.6\n- react-server-dom-parcel (npm): affected from 19.1.0; fixed in 19.1.7\n- react-server-dom-parcel (npm): affected from 19.1.0; fixed in 19.1.7\n- react-server-dom-parcel (npm): affected from 19.2.0; fixed in 19.2.6\n- react-server-dom-parcel (npm): affected from 19.2.0; fixed in 19.2.6\n- react-server-dom-turbopack (npm): affected from 19.0.0; fixed in 19.0.6\n- react-server-dom-turbopack (npm): affected from 19.0.0; fixed in 19.0.6\n- react-server-dom-turbopack (npm): affected from 19.1.0; fixed in 19.1.7\n- react-server-dom-turbopack (npm): affected from 19.1.0; fixed in 19.1.7\n- react-server-dom-turbopack (npm): affected from 19.2.0; fixed in 19.2.6\n- react-server-dom-turbopack (npm): affected from 19.2.0; fixed in 19.2.6\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-23870/ (Markdown: https://insights.sbomify.com/CVE-2026-23870/index.md)","id":"CVE-2026-23870","markdown":"https://insights.sbomify.com/CVE-2026-23870/index.md","name":"CVE-2026-23870","record":{"aliases":["GHSA-rv78-f8rc-xrxh"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"React server DOM library","requires_auth":"none","summary":"Attackers can cause server crashes or resource exhaustion by sending crafted HTTP requests to React server DOM endpoints.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Meta","cpe":[{"product":"react-server-dom-parcel","vendor":"facebook"},{"product":"react-server-dom-turbopack","vendor":"facebook"},{"product":"react-server-dom-webpack","vendor":"facebook"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"A denial of service vulnerability could be triggered by sending specially crafted HTTP requests to server function endpoints, this could lead to server crashes, out-of-memory exceptions or excessive CPU usage; affecting the following packages: react-server-dom-webpack, react-server-dom-parcel, react-server-dom-turbopack (versions 19.0.0 through 19.0.5, 19.1.0 through 19.1.6, and 19.2.0 through 19.2.5).","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":"2026-05-07","github_poc":2,"max_poc_stars":183,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-05-07T23:00:40Z","kind":"github_poc","ref":"https://github.com/dwisiswant0/next-16.2.4-pocs","stars":183,"title":"Next.js v16.2.4 Security PoC Collection (CVE-2026-23870, CVE-2026-44575, CVE-2026-44579, CVE-2026-44574, CVE-2026-44578, CVE-2026-44573, CVE-2026-44581, CVE-2026-44580, CVE-2026-44577, CVE-2026-44576, CVE-2026-44582, CVE-2026-44572)"},{"date":"2026-05-13T14:47:03Z","kind":"github_poc","ref":"https://github.com/emresandikci/nextjs-cve-2026-23870-checker","stars":1,"title":"Checker and fixer for all 13 vulnerabilities in the Next.js May 2026 security release (CVE-2026-23870)"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Facebook React has a Denial of Service Vulnerability in React Server Components","id":"CVE-2026-23870","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":18,"n_references":1,"next":{"headline":"HUSTOJ is Vulnerable to Stored CSV Injection (Formula Injection) in Contest Rank Export","id":"CVE-2026-23873"},"packages":[{"ecosystem":"npm","fixed":["19.0.6"],"introduced":["19.0.0"],"last_affected":[],"package":"react-server-dom-parcel","purl":null,"source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.0.6"],"introduced":["19.0.0"],"last_affected":[],"package":"react-server-dom-parcel","purl":"pkg:npm/react-server-dom-parcel","source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.1.7"],"introduced":["19.1.0"],"last_affected":[],"package":"react-server-dom-parcel","purl":null,"source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.1.7"],"introduced":["19.1.0"],"last_affected":[],"package":"react-server-dom-parcel","purl":"pkg:npm/react-server-dom-parcel","source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.2.6"],"introduced":["19.2.0"],"last_affected":[],"package":"react-server-dom-parcel","purl":null,"source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.2.6"],"introduced":["19.2.0"],"last_affected":[],"package":"react-server-dom-parcel","purl":"pkg:npm/react-server-dom-parcel","source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.0.6"],"introduced":["19.0.0"],"last_affected":[],"package":"react-server-dom-turbopack","purl":null,"source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.0.6"],"introduced":["19.0.0"],"last_affected":[],"package":"react-server-dom-turbopack","purl":"pkg:npm/react-server-dom-turbopack","source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.1.7"],"introduced":["19.1.0"],"last_affected":[],"package":"react-server-dom-turbopack","purl":null,"source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.1.7"],"introduced":["19.1.0"],"last_affected":[],"package":"react-server-dom-turbopack","purl":"pkg:npm/react-server-dom-turbopack","source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.2.6"],"introduced":["19.2.0"],"last_affected":[],"package":"react-server-dom-turbopack","purl":null,"source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.2.6"],"introduced":["19.2.0"],"last_affected":[],"package":"react-server-dom-turbopack","purl":"pkg:npm/react-server-dom-turbopack","source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.0.6"],"introduced":["19.0.0"],"last_affected":[],"package":"react-server-dom-webpack","purl":null,"source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.0.6"],"introduced":["19.0.0"],"last_affected":[],"package":"react-server-dom-webpack","purl":"pkg:npm/react-server-dom-webpack","source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.1.7"],"introduced":["19.1.0"],"last_affected":[],"package":"react-server-dom-webpack","purl":null,"source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.1.7"],"introduced":["19.1.0"],"last_affected":[],"package":"react-server-dom-webpack","purl":"pkg:npm/react-server-dom-webpack","source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.2.6"],"introduced":["19.2.0"],"last_affected":[],"package":"react-server-dom-webpack","purl":null,"source":"GHSA-rv78-f8rc-xrxh"},{"ecosystem":"npm","fixed":["19.2.6"],"introduced":["19.2.0"],"last_affected":[],"package":"react-server-dom-webpack","purl":"pkg:npm/react-server-dom-webpack","source":"GHSA-rv78-f8rc-xrxh"}],"prev":{"headline":"React Server Components have a Denial of Service Vulnerability","id":"CVE-2026-23869"},"products":["react-server-dom-parcel","react-server-dom-turbopack","react-server-dom-webpack"],"published":"2026-05-06","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-06","vendors":["Meta"]},"summary":"Attackers can cause server crashes or resource exhaustion by sending crafted HTTP requests to React server DOM endpoints.","url":"https://insights.sbomify.com/CVE-2026-23870/"}