{"answers":{"affected":"6 open source packages ship an affected version, including undici. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-9679 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-2026-9679 is a medium-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-2026-9679 and fix it if it is affected.\n\nWhat it is: CVE-2026-9679 is a medium-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-2026-9679 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-2026-9679/ (Markdown: https://insights.sbomify.com/CVE-2026-9679/index.md)","id":"CVE-2026-9679","markdown":"https://insights.sbomify.com/CVE-2026-9679/index.md","name":"CVE-2026-9679","record":{"aliases":["AZL-91188","CLEANSTART-2026-RT55969","CLEANSTART-2026-YY11286","DEBIAN-CVE-2026-9679","ECHO-d5e0-7732-0397","GHSA-p88m-4jfj-68fv","MINI-565f-pw9v-hmwp","MINI-67g2-6cpp-6wqg","MINI-85rc-h96g-rr5q","MINI-8wmv-h2x3-936g","MINI-f8xf-6m4f-gv29","MINI-fj6j-7582-33fw","MINI-fprg-hxrh-52m8","MINI-fw8j-pmpx-2x9m","MINI-hf4v-c9jw-fph6","MINI-rhqx-49x5-3hv8","MINI-rwr4-98rr-8jx8","MINI-v477-cm3p-2wvg","MINI-vg6g-wqhc-fhpm","MINI-vgmf-qp4v-vh4g","MINI-w358-3h52-pw65","MINI-x3w4-pw3j-r87c","ROOT-APP-NPM-CVE-2026-9679","UBUNTU-CVE-2026-9679"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js HTTP client","requires_auth":"none","summary":"Attackers can inject HTTP headers via undici's cookie parser, enabling session fixation or cache poisoning in applications forwarding parsed cookies.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"openjs","cpe":[{"product":"undici","vendor":"nodejs"}],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-93","name":"Improper Neutralization of CRLF Sequences"}],"description":"Impact:\nundici's cookie parser in parseSetCookie percent-decodes cookie values via qsUnescape, turning encoded sequences like %0D%0A, %00, %3B, and %3D into their literal byte equivalents. RFC 6265 §5.4 does not specify any decoding and browsers do not decode either.\n\nApplications that parse a Set-Cookie header and then forward the parsed value into a response header (proxies, middleware, SSR frameworks) become vulnerable to HTTP response header injection: an attacker-controlled upstream can inject arbitrary Set-Cookie, Location, or Cache-Control headers into the application's downstream response, enabling session fixation, open redirect, or cache poisoning.\n\nAffected applications are those that use undici's cookie parsing (parseSetCookie, parseCookie, getSetCookies) and forward the parsed cookie value into a response header.\n\nThis was introduced in undici 7.0.0 via PR #3789.\n\nPatches:\nUpgrade to undici v6.26.0, v7.28.0 or v8.5.0.\n\nWorkarounds:\nIf upgrade is not immediately possible, do not forward values returned by parseSetCookie/parseCookie/getSetCookies directly into response headers; sanitize the value first to strip or reject CR, LF, NUL, ;, and = bytes.","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 header injection via Set-Cookie percent-decoding","id":"CVE-2026-9679","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":"MCP Server Exposure via Insecure Default Binding on alibabacloud-rds-openapi-mcp-server","id":"CVE-2026-9680"},"packages":[{"ecosystem":"npm","fixed":["6.27.0"],"introduced":["0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-p88m-4jfj-68fv"},{"ecosystem":"npm","fixed":["6.27.0"],"introduced":["0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-p88m-4jfj-68fv"},{"ecosystem":"npm","fixed":["7.28.0"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-p88m-4jfj-68fv"},{"ecosystem":"npm","fixed":["7.28.0"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-p88m-4jfj-68fv"},{"ecosystem":"npm","fixed":["8.5.0"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-p88m-4jfj-68fv"},{"ecosystem":"npm","fixed":["8.5.0"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-p88m-4jfj-68fv"}],"prev":{"headline":"undici vulnerable to cross-user information disclosure via shared cache whitespace bypass","id":"CVE-2026-9678"},"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":"2026-06-23","vendors":["undici"]},"summary":"Attackers can inject HTTP headers via undici's cookie parser, enabling session fixation or cache poisoning in applications forwarding parsed cookies.","url":"https://insights.sbomify.com/CVE-2026-9679/"}