{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-87866 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-87866 is a critical vulnerability in curl, published on 20 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-87866 and fix it if it is affected.\n\nWhat it is: CVE-2026-87866 is a critical vulnerability in curl, published on 20 Oct 2026. \nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-87866 exists.\n\nAffected product: curl. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-87866/ (Markdown: https://insights.sbomify.com/CVE-2026-87866/index.md)","id":"CVE-2026-87866","markdown":"https://insights.sbomify.com/CVE-2026-87866/index.md","name":"CVE-2026-87866","record":{"aliases":["ALPINE-CVE-2026-87866","AZL-109920","AZL-109953","AZL-110028","AZL-110133","AZL-110211","AZL-110286","CURL-CVE-2026-87866","DEBIAN-CVE-2026-87866","ECHO-354c-d2e4-dde2","GHSA-wq9f-qmpx-2cc8","MINI-3vxq-w992-mxw9"],"analysis":null,"analysis_generated_by":null,"assigner":"curl","cpe":[],"cvss":{"score":9.1,"severity":"critical","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"description":"When built with wolfSSL, curl can successfully validate a pinned public key\nhash against a key the TLS peer does not possess. During the TLS handshake,\nwolfSSL validates the connection, but curl's subsequent re-parsing of the same\ncertificate - tricked by a manipulated validity length field - extracts and\nmatches a different embedded key, incorrectly authorizing the pinned public\nkey.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"wolfSSL public-key pinning bypass","id":"CVE-2026-87866","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Cross-site scripting in Filter Everything — WordPress \u0026 WooCommerce Filters","id":"CVE-2026-87869"},"packages":[],"prev":{"headline":"knownhost callback mismatches key as missing","id":"CVE-2026-87865"},"products":["curl"],"published":"2026-10-20","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-29","vendors":["curl"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-87866/"}