{"answers":{"affected":"6 open source packages ship an affected version, including undici. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-16728 in the wild and no public exploit code.","fix":"Upgrade undici to a fixed version for your release line: 6.28.0, 7.29.0 or 8.9.0.","what":"CVE-2026-16728 is a medium-severity vulnerability in Nodejs Undici, published on 29 Jul 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-2026-16728 and fix it if it is affected.\n\nWhat it is: CVE-2026-16728 is a medium-severity vulnerability in Nodejs Undici, published on 29 Jul 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-2026-16728 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- undici (npm): affected all versions; fixed in 6.28.0\n- undici (npm): affected all versions; fixed in 6.28.0\n- undici (npm): affected from 7.0.0; fixed in 7.29.0\n- undici (npm): affected from 7.0.0; fixed in 7.29.0\n- undici (npm): affected from 8.0.0; fixed in 8.9.0\n- undici (npm): affected from 8.0.0; fixed in 8.9.0\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-2026-16728/ (Markdown: https://insights.sbomify.com/CVE-2026-16728/index.md)","id":"CVE-2026-16728","markdown":"https://insights.sbomify.com/CVE-2026-16728/index.md","name":"CVE-2026-16728","record":{"aliases":["CLEANSTART-2026-CJ83222","CLEANSTART-2026-HI60053","CLEANSTART-2026-VN19790","DEBIAN-CVE-2026-16728","ECHO-cad4-7176-7840","GHSA-8xcm-r25x-g524","MINI-25hw-vw66-gx3x","MINI-2mgg-7vmp-g69r","MINI-36m7-j7p5-jjqq","MINI-3xw3-f74g-hjf4","MINI-4h4c-xq2f-rhmf","MINI-4mg5-ff75-mcm5","MINI-6cjc-jcj6-gqf5","MINI-72qj-gw53-x7qf","MINI-748f-2hpg-2768","MINI-777w-x28q-rcc7","MINI-8v2c-6jw3-353p","MINI-f92f-f9cc-6hpp","MINI-fwx3-r996-532g","MINI-g4cq-cm2f-rrmh","MINI-h4rh-9xwj-2r7r","MINI-hgw6-g3hp-gx5v","MINI-hmr9-qcqr-3qgm","MINI-mw8h-q93j-f532","MINI-pghc-h39j-xvp6","MINI-ph8r-f3w2-m8qq","MINI-qhgh-vrff-gj9m","MINI-rch9-6vvg-25x5","MINI-rwm6-qp87-85rg","MINI-wwhq-hq7c-f9m8","ROOT-APP-NPM-CVE-2026-16728","UBUNTU-CVE-2026-16728"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service","data_modify"],"network_reachable":"yes","non_default_config":true,"product_category":"Node.js HTTP client","requires_auth":"none","summary":"A malicious upstream can cause response desynchronization in undici's retry interceptor, leading to connection hangs or corrupted data in proxy applications.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"openjs","cpe":[{"product":"undici","vendor":"nodejs"}],"cvss":{"score":4.8,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-444","name":"Inconsistent Interpretation of HTTP Requests"}],"description":"undici's retry interceptor can deliver a response whose body length does not match the Content-Length header exposed to the application after a retry or resume of a partial response. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, a malicious or faulty upstream can return a partial response with a mismatched framing header, close the socket early, and have the retry interceptor assemble a body of a different length while the original Content-Length stays attached. Applications that use the retry interceptor and forward upstream headers and bodies downstream, such as proxies or gateways, may then emit an invalid HTTP response with a stale Content-Length, leading to downstream response desynchronization, connection hangs, or response corruption. Exploitation requires the retry interceptor enabled, an upstream returning a mismatched partial response, and a downstream forwarder that does not remove or recalculate Content-Length. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0.","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 downstream response desynchronization via retry interceptor","id":"CVE-2026-16728","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":"nodejs:undici","products":["nodejs:undici"],"type":"other","year":"2026"},"n_packages":6,"n_references":2,"next":{"headline":"undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields","id":"CVE-2026-16729"},"packages":[{"ecosystem":"npm","fixed":["6.28.0"],"introduced":["0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-8xcm-r25x-g524"},{"ecosystem":"npm","fixed":["6.28.0"],"introduced":["0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-8xcm-r25x-g524"},{"ecosystem":"npm","fixed":["7.29.0"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-8xcm-r25x-g524"},{"ecosystem":"npm","fixed":["7.29.0"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-8xcm-r25x-g524"},{"ecosystem":"npm","fixed":["8.9.0"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-8xcm-r25x-g524"},{"ecosystem":"npm","fixed":["8.9.0"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-8xcm-r25x-g524"}],"prev":{"headline":"Race condition in Armoury Crate","id":"CVE-2026-16727"},"products":["undici"],"published":"2026-07-29","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":"2026-07-30","vendors":["undici"]},"summary":"A malicious upstream can cause response desynchronization in undici's retry interceptor, leading to connection hangs or corrupted data in proxy applications.","url":"https://insights.sbomify.com/CVE-2026-16728/"}