{"answers":{"affected":"6 open source packages ship an affected version, including undici. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-19534 in the wild and no public exploit code.","fix":"Upgrade undici to a fixed version for your release line: 6.28.1, 7.29.1 or 8.10.2.","what":"CVE-2026-19534 is a high-severity vulnerability in Nodejs Undici, published on 4 Sep 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-2026-19534 and fix it if it is affected.\n\nWhat it is: CVE-2026-19534 is a high-severity vulnerability in Nodejs Undici, published on 4 Sep 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-2026-19534 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- undici (npm): affected from 6.7.0; fixed in 6.28.1\n- undici (npm): affected from 6.7.0; fixed in 6.28.1\n- undici (npm): affected from 7.0.0; fixed in 7.29.1\n- undici (npm): affected from 7.0.0; fixed in 7.29.1\n- undici (npm): affected from 8.0.0; fixed in 8.10.2\n- undici (npm): affected from 8.0.0; fixed in 8.10.2\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-2026-19534/ (Markdown: https://insights.sbomify.com/CVE-2026-19534/index.md)","id":"CVE-2026-19534","markdown":"https://insights.sbomify.com/CVE-2026-19534/index.md","name":"CVE-2026-19534","record":{"aliases":["CLEANSTART-2026-CK85673","CLEANSTART-2026-IF81553","CLEANSTART-2026-IH07512","CLEANSTART-2026-IQ27663","CLEANSTART-2026-KF40182","CLEANSTART-2026-QG39895","CLSA-2026-1790854776","CLSA-2026-1790856988","CLSA-2026-1790895136","CLSA-2026-1791668718","CLSA-2026-1792867311","DEBIAN-CVE-2026-19534","ECHO-fcf0-fb39-88c4","GHSA-rfgv-xxqx-mfg5","MINI-2m4w-2wqx-m562","MINI-5qhq-6cpc-vmc6","MINI-67rr-f78p-wj93","MINI-7743-572p-cqwc","MINI-7c4f-97j5-f7j5","MINI-8q57-33mr-pxxp","MINI-8rvc-5hcg-hhf8","MINI-9j58-6x44-v6c7","MINI-cg5q-9hhq-2mj5","MINI-gch3-83cj-cc4g","MINI-gh4q-54fj-xh43","MINI-gv4r-v564-gwg2","MINI-j29r-2h8h-hxm6","MINI-mrcq-27ff-cxg8","MINI-p3v6-4rf8-h4r2","MINI-p8j4-jfmq-cjj9","MINI-pcgh-gxj4-q45f","MINI-q467-h968-7xmp","MINI-qfwc-33qx-p6jw","MINI-r4jj-g7wp-jpgr","MINI-v9rc-p489-whr4","MINI-vpvx-g9mf-q679","MINI-ww9x-r63j-qhpj","ROOT-APP-NPM-CVE-2026-19534","UBUNTU-CVE-2026-19534"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js HTTP client","requires_auth":"none","summary":"A remote attacker can crash the Node.js process by sending an unrequested WebSocket subprotocol, causing a null dereference in the undici library.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"openjs","cpe":[{"product":"undici","vendor":"nodejs"}],"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-252","name":"Unchecked Return Value"},{"id":"CWE-248","name":"Uncaught Exception"}],"description":"undici's WebSocket client crashes the whole Node.js process during the opening handshake when a server responds with a subprotocol that the client never requested. A default WebSocket connection sends no subprotocol, but if the server's 101 response includes a Sec-WebSocket-Protocol header, undici dereferences a null value while checking it against the requested list and throws an uncaught TypeError. Because that code runs inside a microtask with no surrounding error handling, the exception propagates and terminates the process under Node's default behavior, instead of gracefully failing the connection as required by the WebSocket protocol. Any application that opens a WebSocket to an attacker-controlled or compromised server, or over a plaintext connection subject to a machine-in-the-middle, can be crashed remotely without authentication in the default configuration. This affects undici versions from 6.7.0 up to 6.28.1, from 7.0.0 up to 7.29.1, and from 8.0.0 up to 8.10.2. Users should upgrade to undici 6.28.1, 7.29.1, or 8.10.2.","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":"undici vulnerable to Denial of Service via unrequested WebSocket subprotocol","id":"CVE-2026-19534","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":"nodejs:undici","products":["nodejs:undici"],"type":"null_dereference","year":"2026"},"n_packages":6,"n_references":2,"next":{"headline":"Cross-site request forgery in EKI-1242EIMS","id":"CVE-2026-19535"},"packages":[{"ecosystem":"npm","fixed":["6.28.1"],"introduced":["6.7.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-rfgv-xxqx-mfg5"},{"ecosystem":"npm","fixed":["6.28.1"],"introduced":["6.7.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-rfgv-xxqx-mfg5"},{"ecosystem":"npm","fixed":["7.29.1"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-rfgv-xxqx-mfg5"},{"ecosystem":"npm","fixed":["7.29.1"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-rfgv-xxqx-mfg5"},{"ecosystem":"npm","fixed":["8.10.2"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-rfgv-xxqx-mfg5"},{"ecosystem":"npm","fixed":["8.10.2"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-rfgv-xxqx-mfg5"}],"prev":{"headline":"Path Traversal in HAVELSAN's Liman MYS","id":"CVE-2026-19532"},"products":["undici"],"published":"2026-09-04","related":[{"cvss_score":7.5,"headline":"undici WebSocket client vulnerable to Denial of Service via failed HTTP/2 handshake","id":"CVE-2026-109855","kev_date_added":null,"published":"2026-10-15"},{"cvss_score":7.5,"headline":"undici vulnerable to Denial of Service via unhandled error on excessive content-encodings","id":"CVE-2026-109869","kev_date_added":null,"published":"2026-10-15"},{"cvss_score":7.5,"headline":"undici vulnerable to Denial of Service via TLS 1.2 certificate-changing renegotiation","id":"CVE-2026-87018","kev_date_added":null,"published":"2026-10-15"},{"cvss_score":7.5,"headline":"undici WebSocket client vulnerable to denial of service via fragment count bypass","id":"CVE-2026-12151","kev_date_added":null,"published":"2026-06-17"},{"cvss_score":7.5,"headline":"undici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse","id":"CVE-2026-6734","kev_date_added":null,"published":"2026-06-17"},{"cvss_score":7.5,"headline":"undici WebSocket client vulnerable to denial of service via cumulative fragment bypass","id":"CVE-2026-9675","kev_date_added":null,"published":"2026-06-17"}],"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":"2026-09-04","vendors":["undici"]},"summary":"A remote attacker can crash the Node.js process by sending an unrequested WebSocket subprotocol, causing a null dereference in the undici library.","url":"https://insights.sbomify.com/CVE-2026-19534/"}