{"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 1 product.","exploited":"There is no known exploitation of CVE-2026-23864 in the wild and no public exploit code.","fix":"Upgrade react-server-dom-parcel to a fixed version for your release line: 19.0.4, 19.1.5 or 19.2.4.","what":"CVE-2026-23864 is a high-severity denial of service vulnerability in Meta react-server-dom-parcel, published on 26 Jan 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-2026-23864 and fix it if it is affected.\n\nWhat it is: CVE-2026-23864 is a high-severity denial of service vulnerability in Meta react-server-dom-parcel, published on 26 Jan 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-2026-23864 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 19.0.4\n- react-server-dom-parcel (npm): affected from 19.0.0; fixed in 19.0.4\n- react-server-dom-parcel (npm): affected from 19.1.0-canary-7130d0c6-20241212; fixed in 19.1.5\n- react-server-dom-parcel (npm): affected from 19.1.0-canary-7130d0c6-20241212; fixed in 19.1.5\n- react-server-dom-parcel (npm): affected from 19.2.0-canary-63779030-20250328; fixed in 19.2.4\n- react-server-dom-parcel (npm): affected from 19.2.0-canary-63779030-20250328; fixed in 19.2.4\n- react-server-dom-turbopack (npm): affected from 19.0.0; fixed in 19.0.4\n- react-server-dom-turbopack (npm): affected from 19.0.0; fixed in 19.0.4\n- react-server-dom-turbopack (npm): affected from 19.1.0-canary-7130d0c6-20241212; fixed in 19.1.5\n- react-server-dom-turbopack (npm): affected from 19.1.0-canary-7130d0c6-20241212; fixed in 19.1.5\n- react-server-dom-turbopack (npm): affected from 19.2.0-canary-63779030-20250328; fixed in 19.2.4\n- react-server-dom-turbopack (npm): affected from 19.2.0-canary-63779030-20250328; fixed in 19.2.4\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-2026-23864/ (Markdown: https://insights.sbomify.com/CVE-2026-23864/index.md)","id":"CVE-2026-23864","markdown":"https://insights.sbomify.com/CVE-2026-23864/index.md","name":"CVE-2026-23864","record":{"aliases":["GHSA-83fc-fqcc-2hmg"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"React Server Components","requires_auth":"none","summary":"Attackers can cause server crashes or resource exhaustion in React Server Components applications by sending crafted HTTP requests to Server Function endpoints.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Meta","cpe":[{"product":"react","vendor":"facebook"}],"cvss":{"score":7.5,"severity":"high","source":"cisa-adp","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-1284","name":"Improper Validation of Specified Quantity in Input"},{"id":"CWE-502","name":"Deserialization of Untrusted Data"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Multiple denial of service vulnerabilities exist in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack.\n\nThe vulnerabilities are triggered by sending specially crafted HTTP requests to Server Function endpoints, and could lead to server crashes, out-of-memory exceptions or excessive CPU usage; depending on the vulnerable code path being exercised, the application configuration and application code.\n\nStrongly consider upgrading to the latest package versions to reduce risk and prevent availability issues in applications using React Server Components.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"React Server Components have multiple Denial of Service Vulnerabilities","id":"CVE-2026-23864","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":"Integer overflow in FreeType","id":"CVE-2026-23865"},"packages":[{"ecosystem":"npm","fixed":["19.0.4"],"introduced":["19.0.0"],"last_affected":[],"package":"react-server-dom-parcel","purl":null,"source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.0.4"],"introduced":["19.0.0"],"last_affected":[],"package":"react-server-dom-parcel","purl":"pkg:npm/react-server-dom-parcel","source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.1.5"],"introduced":["19.1.0-canary-7130d0c6-20241212"],"last_affected":[],"package":"react-server-dom-parcel","purl":null,"source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.1.5"],"introduced":["19.1.0-canary-7130d0c6-20241212"],"last_affected":[],"package":"react-server-dom-parcel","purl":"pkg:npm/react-server-dom-parcel","source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.2.4"],"introduced":["19.2.0-canary-63779030-20250328"],"last_affected":[],"package":"react-server-dom-parcel","purl":null,"source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.2.4"],"introduced":["19.2.0-canary-63779030-20250328"],"last_affected":[],"package":"react-server-dom-parcel","purl":"pkg:npm/react-server-dom-parcel","source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.0.4"],"introduced":["19.0.0"],"last_affected":[],"package":"react-server-dom-turbopack","purl":null,"source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.0.4"],"introduced":["19.0.0"],"last_affected":[],"package":"react-server-dom-turbopack","purl":"pkg:npm/react-server-dom-turbopack","source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.1.5"],"introduced":["19.1.0-canary-7130d0c6-20241212"],"last_affected":[],"package":"react-server-dom-turbopack","purl":null,"source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.1.5"],"introduced":["19.1.0-canary-7130d0c6-20241212"],"last_affected":[],"package":"react-server-dom-turbopack","purl":"pkg:npm/react-server-dom-turbopack","source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.2.4"],"introduced":["19.2.0-canary-63779030-20250328"],"last_affected":[],"package":"react-server-dom-turbopack","purl":null,"source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.2.4"],"introduced":["19.2.0-canary-63779030-20250328"],"last_affected":[],"package":"react-server-dom-turbopack","purl":"pkg:npm/react-server-dom-turbopack","source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.0.4"],"introduced":["19.0.0"],"last_affected":[],"package":"react-server-dom-webpack","purl":null,"source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.0.4"],"introduced":["19.0.0"],"last_affected":[],"package":"react-server-dom-webpack","purl":"pkg:npm/react-server-dom-webpack","source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.1.5"],"introduced":["19.1.0-canary-7130d0c6-20241212"],"last_affected":[],"package":"react-server-dom-webpack","purl":null,"source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.1.5"],"introduced":["19.1.0-canary-7130d0c6-20241212"],"last_affected":[],"package":"react-server-dom-webpack","purl":"pkg:npm/react-server-dom-webpack","source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.2.4"],"introduced":["19.2.0-canary-63779030-20250328"],"last_affected":[],"package":"react-server-dom-webpack","purl":null,"source":"GHSA-83fc-fqcc-2hmg"},{"ecosystem":"npm","fixed":["19.2.4"],"introduced":["19.2.0-canary-63779030-20250328"],"last_affected":[],"package":"react-server-dom-webpack","purl":"pkg:npm/react-server-dom-webpack","source":"GHSA-83fc-fqcc-2hmg"}],"prev":{"headline":"Other in WhatsApp Desktop for Windows","id":"CVE-2026-23863"},"products":["react-server-dom-parcel","react-server-dom-turbopack","react-server-dom-webpack"],"published":"2026-01-26","related":[{"cvss_score":10,"headline":"Meta React Server Components Remote Code Execution","id":"CVE-2025-55182","kev_date_added":"2025-12-05","published":"2025-12-03"},{"cvss_score":7.5,"headline":"Denial of Service Vulnerability in React Server Components","id":"CVE-2025-55184","kev_date_added":null,"published":"2025-12-11"},{"cvss_score":7.5,"headline":"Denial of Service Vulnerability in React Server Components","id":"CVE-2025-67779","kev_date_added":null,"published":"2025-12-11"},{"cvss_score":6.1,"headline":"Cross-Site Scripting in react-dom","id":"CVE-2018-6341","kev_date_added":null,"published":"2018-12-31"},{"cvss_score":5.3,"headline":"Source Code Exposure Vulnerability in React Server Components","id":"CVE-2025-55183","kev_date_added":null,"published":"2025-12-11"}],"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)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-15","vendors":["Meta"]},"summary":"Attackers can cause server crashes or resource exhaustion in React Server Components applications by sending crafted HTTP requests to Server Function endpoints.","url":"https://insights.sbomify.com/CVE-2026-23864/"}