{"answers":{"affected":"6 open source packages ship an affected version, including undici. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-11525 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-2026-11525 is a low-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-2026-11525 and fix it if it is affected.\n\nWhat it is: CVE-2026-11525 is a low-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-2026-11525 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-2026-11525/ (Markdown: https://insights.sbomify.com/CVE-2026-11525/index.md)","id":"CVE-2026-11525","markdown":"https://insights.sbomify.com/CVE-2026-11525/index.md","name":"CVE-2026-11525","record":{"aliases":["AZL-91194","CLEANSTART-2026-BZ34895","CLEANSTART-2026-RS05836","DEBIAN-CVE-2026-11525","ECHO-e368-9a50-56c5","GHSA-g8m3-5g58-fq7m","MINI-3f9r-3g9q-4mmw","MINI-42q5-pfx4-q8g4","MINI-5fjh-pxxq-qc5j","MINI-5h42-v9mj-c43v","MINI-5xrq-9fm4-m6c9","MINI-7m2m-g42c-2h44","MINI-8q7x-m2rp-j2gv","MINI-93c5-v357-m8j4","MINI-g2vg-3m5m-hc2c","MINI-gj37-h88h-xr99","MINI-hfp4-h7wf-6xv4","MINI-jcw6-j8pm-g33g","MINI-jjqr-xqg3-8vr3","MINI-pq7c-33fx-8p3f","MINI-q2fh-gq2p-gcg2","MINI-wwxj-cpm4-gfwg","ROOT-APP-NPM-CVE-2026-11525","UBUNTU-CVE-2026-11525"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js HTTP client","requires_auth":"none","summary":"Attackers can downgrade cookie SameSite protections by exploiting permissive substring matching in undici's Set-Cookie parser, weakening CSRF defenses.","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":3.7,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-183","name":"Permissive List of Allowed Inputs"}],"description":"Impact:\nWhen undici parses a Set-Cookie header, it accepts any SameSite attribute value that contains Strict, Lax, or None as a substring, rather than the case-insensitive exact match specified by RFC 6265. Non-spec values are silently mapped to one of the three standard tokens. For example, SameSite=NoneOfYourBusiness is parsed as None (the most permissive setting), and SameSite=StrictLax is parsed as Lax (a downgrade from Strict).\n\nAffected applications are those that consume Set-Cookie headers from server responses (for example via undici's fetch or proxy code paths) and then forward or rely on the parsed sameSite attribute. A malicious or non-compliant server can coerce the consumer's view of a cookie's SameSite policy to a weaker value, silently degrading the SameSite enforcement the cookie is supposed to provide.\n\nThis was introduced in undici 5.15.0 when the cookies feature was added.\n\nPatches:\nUpgrade to undici v6.26.0, v7.28.0 or v8.5.0.\n\nWorkarounds:\nAfter parsing a Set-Cookie header, validate that the resulting sameSite attribute is one of 'Strict', 'Lax', or 'None' (exact, case-insensitive) before forwarding or relying on it.","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 Set-Cookie SameSite attribute downgrade via permissive substring matching","id":"CVE-2026-11525","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":"Command injection in GD","id":"CVE-2026-11526"},"packages":[{"ecosystem":"npm","fixed":["6.27.0"],"introduced":["0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-g8m3-5g58-fq7m"},{"ecosystem":"npm","fixed":["6.27.0"],"introduced":["0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-g8m3-5g58-fq7m"},{"ecosystem":"npm","fixed":["7.28.0"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-g8m3-5g58-fq7m"},{"ecosystem":"npm","fixed":["7.28.0"],"introduced":["7.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-g8m3-5g58-fq7m"},{"ecosystem":"npm","fixed":["8.5.0"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":null,"source":"GHSA-g8m3-5g58-fq7m"},{"ecosystem":"npm","fixed":["8.5.0"],"introduced":["8.0.0"],"last_affected":[],"package":"undici","purl":"pkg:npm/undici","source":"GHSA-g8m3-5g58-fq7m"}],"prev":{"headline":"Tenda W20E Web Management modifyWifiFilterRules stack-based overflow","id":"CVE-2026-11524"},"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":"2026-06-17","vendors":["undici"]},"summary":"Attackers can downgrade cookie SameSite protections by exploiting permissive substring matching in undici's Set-Cookie parser, weakening CSRF defenses.","url":"https://insights.sbomify.com/CVE-2026-11525/"}