{"answers":{"affected":"6 open source packages ship an affected version, including github.com/patrickhener/goshs and github.com/patrickhener/goshs/v2. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40884 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-40884 is a critical authentication bypass vulnerability in patrickhener goshs, published on 21 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-2026-40884 and fix it if it is affected.\n\nWhat it is: CVE-2026-40884 is a critical authentication bypass vulnerability in patrickhener goshs, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40884 exists.\n\nAffected packages and fixed versions:\n- github.com/patrickhener/goshs (Go): affected all versions; no fix listed\n- github.com/patrickhener/goshs (Go): affected all versions up to 1.1.4; no fix listed\n- github.com/patrickhener/goshs (Go): affected all versions up to 1.1.4; no fix listed\n- github.com/patrickhener/goshs/v2 (Go): affected all versions; fixed in 2.0.0\n- github.com/patrickhener/goshs/v2 (Go): affected all versions; fixed in 2.0.0\n- github.com/patrickhener/goshs/v2 (Go): affected all versions; fixed in 2.0.0\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-2026-40884/ (Markdown: https://insights.sbomify.com/CVE-2026-40884/index.md)","id":"CVE-2026-40884","markdown":"https://insights.sbomify.com/CVE-2026-40884/index.md","name":"CVE-2026-40884","record":{"aliases":["GHSA-c29w-qq4m-2gcv","GO-2026-5303"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Go HTTP server","requires_auth":"none","summary":"An unauthenticated attacker can bypass SFTP password authentication in goshs when configured with an empty username, allowing unauthorized file access.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"goshs","vendor":"goshs"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"}],"description":"goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.6, goshs contains an SFTP authentication bypass when the documented empty-username basic-auth syntax is used. If the server is started with -b ':pass' together with -sftp, goshs accepts that configuration but does not install any SFTP password handler. As a result, an unauthenticated network attacker can connect to the SFTP service and access files without a password. This vulnerability is fixed in 2.0.0-beta.6.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"goshs: Empty-username SFTP password authentication bypass in goshs","id":"CVE-2026-40884","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":6,"n_references":1,"next":{"headline":"goshs: Public collaborator feed leaks .goshs ACL credentials and enables unauthorized access","id":"CVE-2026-40885"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/patrickhener/goshs","purl":"pkg:golang/github.com/patrickhener/goshs","source":"GO-2026-5303"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.1.4"],"package":"github.com/patrickhener/goshs","purl":null,"source":"GHSA-c29w-qq4m-2gcv"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.1.4"],"package":"github.com/patrickhener/goshs","purl":"pkg:golang/github.com/patrickhener/goshs","source":"GHSA-c29w-qq4m-2gcv"},{"ecosystem":"Go","fixed":["2.0.0"],"introduced":["0"],"last_affected":[],"package":"github.com/patrickhener/goshs/v2","purl":null,"source":"GHSA-c29w-qq4m-2gcv"},{"ecosystem":"Go","fixed":["2.0.0"],"introduced":["0"],"last_affected":[],"package":"github.com/patrickhener/goshs/v2","purl":"pkg:golang/github.com/patrickhener/goshs/v2","source":"GHSA-c29w-qq4m-2gcv"},{"ecosystem":"Go","fixed":["2.0.0"],"introduced":["0"],"last_affected":[],"package":"github.com/patrickhener/goshs/v2","purl":"pkg:golang/github.com/patrickhener/goshs/v2","source":"GO-2026-5303"}],"prev":{"headline":"goshs: CSRF in state-changing GET routes enables authenticated file deletion and directory creation","id":"CVE-2026-40883"},"products":["goshs"],"published":"2026-04-21","related":[{"cvss_score":9.8,"headline":"goshs has an Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs PUT Upload","id":"CVE-2026-35392","kev_date_added":null,"published":"2026-04-06"},{"cvss_score":9.8,"headline":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs POST multipart upload","id":"CVE-2026-35393","kev_date_added":null,"published":"2026-04-06"},{"cvss_score":9.8,"headline":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in goshs","id":"CVE-2026-35471","kev_date_added":null,"published":"2026-04-06"},{"cvss_score":9.3,"headline":"goshs has a file-based ACL authorization bypass in goshs state-changing routes","id":"CVE-2026-40189","kev_date_added":null,"published":"2026-04-10"},{"cvss_score":9.1,"headline":"Goshs - ArtiPACKED Vulnerability – GitHub Actions Credential Persistence","id":"CVE-2026-40903","kev_date_added":null,"published":"2026-04-21"},{"cvss_score":8.7,"headline":"SFTP root escape via prefix-based path validation in goshs","id":"CVE-2026-40876","kev_date_added":null,"published":"2026-04-21"}],"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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"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":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-04-22","vendors":["patrickhener"]},"summary":"An unauthenticated attacker can bypass SFTP password authentication in goshs when configured with an empty username, allowing unauthorized file access.","url":"https://insights.sbomify.com/CVE-2026-40884/"}