{"answers":{"affected":"4 open source packages ship an affected version, including undici. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-84933 in the wild and no public exploit code.","fix":"Upgrade undici to a fixed version for your release line: 7.29.1 or 8.10.2.","what":"CVE-2026-84933 is a medium-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-2026-84933 and fix it if it is affected.\n\nWhat it is: CVE-2026-84933 is a medium-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-2026-84933 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\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-2026-84933/ (Markdown: https://insights.sbomify.com/CVE-2026-84933/index.md)","id":"CVE-2026-84933","markdown":"https://insights.sbomify.com/CVE-2026-84933/index.md","name":"CVE-2026-84933","record":{"aliases":["CLEANSTART-2026-HS02762","CLEANSTART-2026-VO74481","CLEANSTART-2026-WF83239","CLEANSTART-2026-XL00241","CLSA-2026-1790756976","CLSA-2026-1790863452","CLSA-2026-1792867310","DEBIAN-CVE-2026-84933","ECHO-ac66-b5b7-0486","GHSA-2jfj-6hjv-fm6j","MINI-2h2h-7m7h-wwc3","MINI-4fqm-2xmm-3hf8","MINI-5h28-96fh-ff4f","MINI-6c79-ff3m-m225","MINI-8jxh-44xp-gfjc","MINI-fhxc-3qjp-9g9f","MINI-fvfx-cm9x-6r22","MINI-gmr3-6948-3fj2","MINI-hc49-whcr-xwh5","MINI-mc6x-ccrr-53xh","MINI-mv39-39jj-5f34","MINI-pp3m-7ph7-qfpv","MINI-q9g5-4j9w-9xhw","MINI-r396-w54g-2xm9","MINI-r3gj-5vhj-j3v8","MINI-vfhf-h83v-rq75","ROOT-APP-NPM-CVE-2026-84933","UBUNTU-CVE-2026-84933"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js HTTP client","requires_auth":"none","summary":"undici's shared cache leaks Set-Cookie headers to other users, allowing cookie disclosure and injection by untrusted servers.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"openjs","cpe":[{"product":"undici","vendor":"nodejs"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-524","name":"Use of Cache Containing Sensitive Information"},{"id":"CWE-200","name":"Exposure of Sensitive Information to an Unauthorized Actor"}],"description":"undici's cache interceptor does not handle the Set-Cookie response header anywhere in its cache path, so it neither refuses to store nor strips that header. In shared cache mode, which is the default, an otherwise cacheable response that carries a Set-Cookie header, for example one marked with a public and max-age directive, is stored and then re-served to a later caller that matches the same cache key. As a result one caller's cookie is disclosed to a different caller, and an untrusted server can inject cookies into cached responses served to all subsequent callers. This violates the requirement that a shared cache must not store cookies. This affects undici versions from 7.0.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 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 cross-user cookie disclosure via Set-Cookie caching in shared caches","id":"CVE-2026-84933","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":"nodejs:undici","products":["nodejs:undici"],"type":"information_disclosure","year":"2026"},"n_packages":4,"n_references":2,"next":{"headline":"JCH Optimize \u003c 6.0.1 - Subscriber+ Stored XSS via getcacheinfo Task Override","id":"CVE-2026-84934"},"packages":[{"ecosystem":"npm","fixed":["7.29.1"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-2jfj-6hjv-fm6j"},{"ecosystem":"npm","fixed":["7.29.1"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-2jfj-6hjv-fm6j"},{"ecosystem":"npm","fixed":["8.10.2"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-2jfj-6hjv-fm6j"},{"ecosystem":"npm","fixed":["8.10.2"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-2jfj-6hjv-fm6j"}],"prev":{"headline":"Joli Table Of Contents \u003c 3.0.3 - Author+ Stored XSS via joli-toc Shortcode Theme Attribute","id":"CVE-2026-84931"},"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 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":"2026-09-04","vendors":["undici"]},"summary":"undici's shared cache leaks Set-Cookie headers to other users, allowing cookie disclosure and injection by untrusted servers.","url":"https://insights.sbomify.com/CVE-2026-84933/"}