{"answers":{"affected":"6 open source packages ship an affected version, including undici. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-6733 in the wild and no public exploit code.","fix":"Upgrade undici to a fixed version for your release line: 6.27.0, 7.28.0 or 8.5.0.","what":"CVE-2026-6733 is a low-severity vulnerability in Nodejs Undici, published on 17 Jun 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-2026-6733 and fix it if it is affected.\n\nWhat it is: CVE-2026-6733 is a low-severity vulnerability in Nodejs Undici, published on 17 Jun 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-2026-6733 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- undici (npm): affected all versions; fixed in 6.27.0\n- undici (npm): affected all versions; fixed in 6.27.0\n- undici (npm): affected from 7.0.0; fixed in 7.28.0\n- undici (npm): affected from 7.0.0; fixed in 7.28.0\n- undici (npm): affected from 8.0.0; fixed in 8.5.0\n- undici (npm): affected from 8.0.0; fixed in 8.5.0\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-2026-6733/ (Markdown: https://insights.sbomify.com/CVE-2026-6733/index.md)","id":"CVE-2026-6733","markdown":"https://insights.sbomify.com/CVE-2026-6733/index.md","name":"CVE-2026-6733","record":{"aliases":["CLEANSTART-2026-BS54075","CLEANSTART-2026-UR64263","CLSA-2026-1784112338","CLSA-2026-1784113246","CLSA-2026-1791631203","DEBIAN-CVE-2026-6733","ECHO-0ed3-95c6-1c1c","GHSA-35p6-xmwp-9g52","MINI-2rwr-3p5f-xwv2","MINI-2x9c-w27j-9f9j","MINI-48mp-hcph-jc47","MINI-5q2j-2pc8-fqv4","MINI-83vf-6w2f-5mm2","MINI-8vfr-4j26-85wq","MINI-f7rc-cv66-j79j","MINI-f9jh-35qf-cc6x","MINI-g2qc-v948-5xm4","MINI-m77v-6x22-pq5p","MINI-pjw6-9ff5-qp97","MINI-r6j2-8vqf-phrp","MINI-v647-4rr9-344c","MINI-vjw5-c748-8wr3","MINI-w6vg-jgm9-m4h6","MINI-wgq4-mcvh-fhhf","ROOT-APP-NPM-CVE-2026-6733","UBUNTU-CVE-2026-6733"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js HTTP client","requires_auth":"none","summary":"An attacker-controlled server can poison HTTP response queues in undici, causing responses to be delivered to wrong requests via keep-alive reuse.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"openjs","cpe":[{"product":"undici","vendor":"nodejs"}],"cvss":{"score":3.7,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-367","name":"Time-of-check Time-of-use (TOCTOU) Race Condition"}],"description":"Impact:\nUndici's HTTP/1.1 client is vulnerable to response queue poisoning on reused keep-alive sockets. An attacker-controlled upstream server can inject an unsolicited HTTP/1.1 response onto an idle socket after a request completes. When the client dispatches the next request on that socket, it associates the injected response with the new request, causing responses to be delivered to the wrong requests.\n\nThis requires an attacker-controlled or compromised upstream HTTP/1.1 server and keep-alive connection reuse.\n\nPatches:\nUpgrade to undici v6.26.0, v7.28.0 or v8.5.0.\n\nWorkarounds:\nDisable keep-alive connection reuse by setting keepAliveTimeout: 0 on the Client or Pool.","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 HTTP response queue poisoning via keep-alive socket reuse","id":"CVE-2026-6733","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":"nodejs:undici","products":["nodejs:undici"],"type":"other","year":"2026"},"n_packages":6,"n_references":3,"next":{"headline":"undici vulnerable to cross-origin request routing via SOCKS5 proxy pool reuse","id":"CVE-2026-6734"},"packages":[{"ecosystem":"npm","fixed":["6.27.0"],"introduced":["0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-35p6-xmwp-9g52"},{"ecosystem":"npm","fixed":["6.27.0"],"introduced":["0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-35p6-xmwp-9g52"},{"ecosystem":"npm","fixed":["7.28.0"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-35p6-xmwp-9g52"},{"ecosystem":"npm","fixed":["7.28.0"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-35p6-xmwp-9g52"},{"ecosystem":"npm","fixed":["8.5.0"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-35p6-xmwp-9g52"},{"ecosystem":"npm","fixed":["8.5.0"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-35p6-xmwp-9g52"}],"prev":{"headline":"Libxml2: libxml2: denial of service via crafted xsd-validated document","id":"CVE-2026-6732"},"products":["undici"],"published":"2026-06-17","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 vulnerable to Denial of Service via unrequested WebSocket subprotocol","id":"CVE-2026-19534","kev_date_added":null,"published":"2026-09-04"},{"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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-17","vendors":["undici"]},"summary":"An attacker-controlled server can poison HTTP response queues in undici, causing responses to be delivered to wrong requests via keep-alive reuse.","url":"https://insights.sbomify.com/CVE-2026-6733/"}