{"answers":{"affected":"4 open source packages ship an affected version, including undici. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-1527 in the wild and no public exploit code.","fix":"Upgrade undici to a fixed version for your release line: 6.24.0 or 7.24.0.","what":"CVE-2026-1527 is a medium-severity vulnerability in Nodejs Undici, published on 12 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-1527 and fix it if it is affected.\n\nWhat it is: CVE-2026-1527 is a medium-severity vulnerability in Nodejs Undici, published on 12 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-1527 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- undici (npm): affected all versions; fixed in 6.24.0\n- undici (npm): affected all versions; fixed in 6.24.0\n- undici (npm): affected from 7.0.0; fixed in 7.24.0\n- undici (npm): affected from 7.0.0; fixed in 7.24.0\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-2026-1527/ (Markdown: https://insights.sbomify.com/CVE-2026-1527/index.md)","id":"CVE-2026-1527","markdown":"https://insights.sbomify.com/CVE-2026-1527/index.md","name":"CVE-2026-1527","record":{"aliases":["BELL-CVE-2026-1527","CLEANSTART-2026-FZ57478","CLEANSTART-2026-WR15382","DEBIAN-CVE-2026-1527","ECHO-97b5-e152-578d","GHSA-4992-7rv2-5pvq","MINI-3fgx-hccc-hm6q","MINI-4rgr-2f52-j36h","MINI-fcfc-f83v-fq5c","MINI-g4mv-4p5v-f7mp","MINI-h444-fq94-jfc2","MINI-h5xc-966m-ccr9","MINI-j5pw-7gjw-738g","MINI-m554-ppx8-r58x","MINI-phmp-vjcv-cqrx","MINI-pmg3-6ch3-v3f3","ROOT-APP-NPM-CVE-2026-1527","UBUNTU-CVE-2026-1527"],"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":"low_privilege","summary":"Attackers can inject CRLF sequences via the upgrade option to manipulate HTTP headers or smuggle data, affecting applications using undici.","user_interaction":"required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"openjs","cpe":[{"product":"undici","vendor":"nodejs"}],"cvss":{"score":4.6,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-93","name":"Improper Neutralization of CRLF Sequences"}],"description":"ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\\r\\n) to:\n\n  *  Inject arbitrary HTTP headers\n  *  Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch)\nThe vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:\n\n// lib/dispatcher/client-h1.js:1121\nif (upgrade) {\n  header += `connection: upgrade\\r\\nupgrade: ${upgrade}\\r\\n`\n}","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 is vulnerable to CRLF Injection via upgrade option","id":"CVE-2026-1527","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":"nodejs:undici","products":["nodejs:undici"],"type":"other","year":"2026"},"n_packages":4,"n_references":3,"next":{"headline":"undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client","id":"CVE-2026-1528"},"packages":[{"ecosystem":"npm","fixed":["6.24.0"],"introduced":["0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-4992-7rv2-5pvq"},{"ecosystem":"npm","fixed":["6.24.0"],"introduced":["0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-4992-7rv2-5pvq"},{"ecosystem":"npm","fixed":["7.24.0"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-4992-7rv2-5pvq"},{"ecosystem":"npm","fixed":["7.24.0"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-4992-7rv2-5pvq"}],"prev":{"headline":"undici is vulnerable to Unbounded Memory Consumption in undici WebSocket permessage-deflate Decompression","id":"CVE-2026-1526"},"products":["undici"],"published":"2026-03-12","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":"2026-03-13","vendors":["undici"]},"summary":"Attackers can inject CRLF sequences via the upgrade option to manipulate HTTP headers or smuggle data, affecting applications using undici.","url":"https://insights.sbomify.com/CVE-2026-1527/"}