{"answers":{"affected":"6 open source packages ship an affected version, including undici. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-109383 in the wild and no public exploit code.","fix":"Upgrade undici to a fixed version for your release line: 6.29.1, 7.30.1 or 8.12.2.","what":"CVE-2026-109383 is a high-severity vulnerability in Nodejs Undici, published on 15 Oct 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-2026-109383 and fix it if it is affected.\n\nWhat it is: CVE-2026-109383 is a high-severity vulnerability in Nodejs Undici, published on 15 Oct 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-2026-109383 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- undici (npm): affected from 4.0.0; fixed in 6.29.1\n- undici (npm): affected from 4.0.0; fixed in 6.29.1\n- undici (npm): affected from 7.0.0; fixed in 7.30.1\n- undici (npm): affected from 7.0.0; fixed in 7.30.1\n- undici (npm): affected from 8.0.0; fixed in 8.12.2\n- undici (npm): affected from 8.0.0; fixed in 8.12.2\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-2026-109383/ (Markdown: https://insights.sbomify.com/CVE-2026-109383/index.md)","id":"CVE-2026-109383","markdown":"https://insights.sbomify.com/CVE-2026-109383/index.md","name":"CVE-2026-109383","record":{"aliases":["CLEANSTART-2026-LA92040","DEBIAN-CVE-2026-109383","ECHO-a72a-81c9-1817","GHSA-2m5v-pch6-74hx","ROOT-APP-NPM-CVE-2026-109383","UBUNTU-CVE-2026-109383"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Node.js HTTP client","requires_auth":"none","summary":"Attackers can bypass custom TLS certificate validation in undici by exploiting dropped options, allowing acceptance of malicious certificates.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"openjs","cpe":[{"product":"undici","vendor":"nodejs"}],"cvss":{"score":7.4,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"description":"undici is an HTTP client library for Node.js. In versions 4.0.0 through 6.29.0, 7.0.0 through 7.30.0, and 8.0.0 through 8.12.1, its Agent dispatcher passes its constructor options through a JSON-based deep clone before forwarding them to each per-origin pool, and because JSON cannot represent functions, a caller-supplied tls option containing a checkServerIdentity callback is silently dropped before it reaches the TLS layer. As a result, a TLS peer whose certificate a custom checkServerIdentity was written to reject, but which passes Node's default hostname and chain checks, is silently accepted. Because Agent is the default dispatcher behind request, fetch, and setGlobalDispatcher, this affects the path most applications use, and EnvHttpProxyAgent is affected on its direct and no-proxy routes as well, while only applications that pass a function-valued tls option such as a custom checkServerIdentity for certificate or public-key pinning are at risk. The issue is fixed in undici 6.29.1, 7.30.1, and 8.12.2, which preserve the tls option outside the JSON clone so custom verification callbacks are forwarded unchanged, and users should upgrade to one of those versions or later. As a workaround, pass the TLS options through connect instead of tls, or for proxied destinations use requestTls and proxyTls.","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 TLS certificate validation bypass via dropped tls options in Agent","id":"CVE-2026-109383","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":"nodejs:undici","products":["nodejs:undici"],"type":"security_feature_bypass","year":"2026"},"n_packages":6,"n_references":2,"next":{"headline":"The The Innovative Form Builder – IvyForms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including,","id":"CVE-2026-109384"},"packages":[{"ecosystem":"npm","fixed":["6.29.1"],"introduced":["4.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-2m5v-pch6-74hx"},{"ecosystem":"npm","fixed":["6.29.1"],"introduced":["4.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-2m5v-pch6-74hx"},{"ecosystem":"npm","fixed":["7.30.1"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-2m5v-pch6-74hx"},{"ecosystem":"npm","fixed":["7.30.1"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-2m5v-pch6-74hx"},{"ecosystem":"npm","fixed":["8.12.2"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-2m5v-pch6-74hx"},{"ecosystem":"npm","fixed":["8.12.2"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-2m5v-pch6-74hx"}],"prev":{"headline":"Missing authorization in WSP MCP – Free MCP Plugin for WordPress: Connect Claude, ChatGPT \u0026 AI Agents","id":"CVE-2026-109382"},"products":["undici"],"published":"2026-10-15","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":"total"},"state":"PUBLISHED","updated":"2026-10-16","vendors":["undici"]},"summary":"Attackers can bypass custom TLS certificate validation in undici by exploiting dropped options, allowing acceptance of malicious certificates.","url":"https://insights.sbomify.com/CVE-2026-109383/"}