{"answers":{"affected":"2 open source packages ship an affected version, including hono. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-27700 in the wild and no public exploit code.","fix":"Upgrade hono to 4.12.2 or later.","what":"CVE-2026-27700 is a high-severity authentication bypass vulnerability in honojs hono, published on 25 Feb 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-2026-27700 and fix it if it is affected.\n\nWhat it is: CVE-2026-27700 is a high-severity authentication bypass vulnerability in honojs hono, published on 25 Feb 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-2026-27700 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- hono (npm): affected from 4.12.0; fixed in 4.12.2\n- hono (npm): affected from 4.12.0; fixed in 4.12.2\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-2026-27700/ (Markdown: https://insights.sbomify.com/CVE-2026-27700/index.md)","id":"CVE-2026-27700","markdown":"https://insights.sbomify.com/CVE-2026-27700/index.md","name":"CVE-2026-27700","record":{"aliases":["GHSA-xh87-mx6m-69f3"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"JavaScript web framework","requires_auth":"none","summary":"Attackers can bypass IP-based access controls in Hono applications deployed on AWS Lambda ALB by spoofing the X-Forwarded-For header.","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":8.2,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-345","name":"Insufficient Verification of Data Authenticity"},{"id":"CWE-290","name":"Authentication Bypass by Spoofing"}],"description":"Hono is a Web application framework that provides support for any JavaScript runtime. In versions 4.12.0 and 4.12.1, when using the AWS Lambda adapter (`hono/aws-lambda`) behind an Application Load Balancer (ALB), the `getConnInfo()` function incorrectly selected the first value from the `X-Forwarded-For` header. Because AWS ALB appends the real client IP address to the end of the `X-Forwarded-For` header, the first value can be attacker-controlled. This could allow IP-based access control mechanisms (such as the `ipRestriction` middleware) to be bypassed. Version 4.12.2 patches the issue.","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 is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo","id":"CVE-2026-27700","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":"LiveCodes vulnerable to JavaScript Injection via untrusted PR title in i18n-update-pull workflow","id":"CVE-2026-27701"},"packages":[{"ecosystem":"npm","fixed":["4.12.2"],"introduced":["4.12.0"],"last_affected":[],"package":"hono","purl":null,"source":"GHSA-xh87-mx6m-69f3"},{"ecosystem":"npm","fixed":["4.12.2"],"introduced":["4.12.0"],"last_affected":[],"package":"hono","purl":"pkg:npm/hono","source":"GHSA-xh87-mx6m-69f3"}],"prev":{"headline":"Basic FTP has Path Traversal Vulnerability in its downloadToDir() method","id":"CVE-2026-27699"},"products":["hono"],"published":"2026-02-25","related":[{"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-02-27","vendors":["honojs"]},"summary":"Attackers can bypass IP-based access controls in Hono applications deployed on AWS Lambda ALB by spoofing the X-Forwarded-For header.","url":"https://insights.sbomify.com/CVE-2026-27700/"}