{"answers":{"affected":"2 open source packages ship an affected version, including hono. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-39409 in the wild and no public exploit code.","fix":"Upgrade hono to 4.12.12 or later.","what":"CVE-2026-39409 is a medium-severity authentication bypass vulnerability in honojs hono, published on 8 Apr 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-2026-39409 and fix it if it is affected.\n\nWhat it is: CVE-2026-39409 is a medium-severity authentication bypass vulnerability in honojs hono, published on 8 Apr 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-2026-39409 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- hono (npm): affected all versions; fixed in 4.12.12\n- hono (npm): affected all versions; fixed in 4.12.12\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-2026-39409/ (Markdown: https://insights.sbomify.com/CVE-2026-39409/index.md)","id":"CVE-2026-39409","markdown":"https://insights.sbomify.com/CVE-2026-39409/index.md","name":"CVE-2026-39409","record":{"aliases":["CLEANSTART-2026-SE49941","CLEANSTART-2026-YO53266","GHSA-xpcf-pg52-r92g","MINI-82fr-77jf-whmg","MINI-937m-6mf6-v3cp","MINI-gfwv-jm4c-7wr2","MINI-j3q2-72g7-29xh","MINI-pv3g-x36c-hcxw","MINI-wmxc-6f9j-ww8p","MINI-wqg9-6999-hvjw","ROOT-APP-NPM-CVE-2026-39409"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Hono web framework","requires_auth":"none","summary":"Attackers can bypass IP restrictions in Hono applications by using IPv4-mapped IPv6 addresses, potentially gaining unauthorized access.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"hono","vendor":"hono"}],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-180","name":"Incorrect Behavior Order: Validate Before Canonicalize"}],"description":"Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, ipRestriction() does not canonicalize IPv4-mapped IPv6 client addresses (e.g. ::ffff:127.0.0.1) before applying IPv4 allow or deny rules. In environments such as Node.js dual-stack, this can cause IPv4 rules to fail to match, leading to unintended authorization behavior. This vulnerability is fixed in 4.12.12.","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":"Hono has incorrect IP matching in ipRestriction() for IPv4-mapped IPv6 addresses","id":"CVE-2026-39409","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"Hono has a non-breaking space prefix bypass in cookie name handling in getCookie()","id":"CVE-2026-39410"},"packages":[{"ecosystem":"npm","fixed":["4.12.12"],"introduced":["0"],"last_affected":[],"package":"hono","purl":null,"source":"GHSA-xpcf-pg52-r92g"},{"ecosystem":"npm","fixed":["4.12.12"],"introduced":["0"],"last_affected":[],"package":"hono","purl":"pkg:npm/hono","source":"GHSA-xpcf-pg52-r92g"}],"prev":{"headline":"Hono has a path traversal in toSSG() allows writing files outside the output directory","id":"CVE-2026-39408"},"products":["hono"],"published":"2026-04-08","related":[{"cvss_score":8.2,"headline":"Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo","id":"CVE-2026-27700","kev_date_added":null,"published":"2026-02-25"},{"cvss_score":8.2,"headline":"JWT Algorithm Confusion via Unsafe Default (HS256) in Hono JWT Middleware Allows Token Forgery and Auth Bypass","id":"CVE-2026-22817","kev_date_added":null,"published":"2026-01-13"},{"cvss_score":8.2,"headline":"JWT algorithm confusion in Hono JWK Auth Middleware when JWK lacks \"alg\" (untrusted header.alg fallback)","id":"CVE-2026-22818","kev_date_added":null,"published":"2026-01-13"},{"cvss_score":8.1,"headline":"Hono Improperly Authorizes JWT Audience Validation","id":"CVE-2025-62610","kev_date_added":null,"published":"2025-10-22"},{"cvss_score":7.5,"headline":"Hono: Arbitrary file access via serveStatic vulnerability","id":"CVE-2026-29045","kev_date_added":null,"published":"2026-03-04"},{"cvss_score":7.5,"headline":"Hono contains a flaw in URL path parsing, potentially leading to path confusion","id":"CVE-2025-58362","kev_date_added":null,"published":"2025-09-04"},{"cvss_score":6.5,"headline":"hono/jsx does not isolate context per request, leading to cross-request data disclosure","id":"CVE-2026-59896","kev_date_added":null,"published":"2026-07-08"}],"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":"2026-04-08","vendors":["honojs"]},"summary":"Attackers can bypass IP restrictions in Hono applications by using IPv4-mapped IPv6 addresses, potentially gaining unauthorized access.","url":"https://insights.sbomify.com/CVE-2026-39409/"}