{"answers":{"affected":"5 open source packages ship an affected version, including github.com/ecnepsnai/web. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-4236 in the wild and no public exploit code.","fix":"Upgrade github.com/ecnepsnai/web to 1.5.2 or later.","what":"CVE-2021-4236 is a critical authentication bypass vulnerability in github.com/ecnepsnai/web, published on 27 Dec 2022. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-4236 and fix it if it is affected.\n\nWhat it is: CVE-2021-4236 is a critical authentication bypass vulnerability in github.com/ecnepsnai/web, published on 27 Dec 2022. 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-2021-4236 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/ecnepsnai/web (Go): affected from 1.4.0; fixed in 1.5.2\n- github.com/ecnepsnai/web (Go): affected from 1.4.0; fixed in 1.5.2\n- github.com/ecnepsnai/web (Go): affected from 1.4.0; fixed in 1.5.2\n- github.com/ecnepsnai/web (Go): affected from 1.4.0; fixed in 1.5.2\n- github.com/ecnepsnai/web (Go): affected from 1.4.0; fixed in 1.5.2\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-2021-4236/ (Markdown: https://insights.sbomify.com/CVE-2021-4236/index.md)","id":"CVE-2021-4236","markdown":"https://insights.sbomify.com/CVE-2021-4236/index.md","name":"CVE-2021-4236","record":{"aliases":["GHSA-5gjg-jgh4-gppm","GHSA-jpgg-cp2x-qrw3","GO-2021-0107"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass","denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Go web library","requires_auth":"none","summary":"Attackers can bypass authentication or cause a panic in WebSocket connections if an AuthenticateMethod hook is configured.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Go","cpe":[{"product":"web","vendor":"web_project"}],"cvss":{"score":9.8,"severity":"critical","source":"cisa-adp","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-476","name":"NULL Pointer Dereference"}],"description":"Web Sockets do not execute any AuthenticateMethod methods which may be set, leading to a nil pointer dereference if the returned UserData pointer is assumed to be non-nil, or authentication bypass. This issue only affects WebSockets with an AuthenticateMethod hook. Request handlers that do not explicitly use WebSockets are not vulnerable.","ecosystems":["Go"],"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":"Panic or authentication bypass in github.com/ecnepsnai/web","id":"CVE-2021-4236","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"auth_bypass","year":"2021"},"n_packages":5,"n_references":2,"next":{"headline":"reserved but not needed","id":"CVE-2021-4237"},"packages":[{"ecosystem":"Go","fixed":["1.5.2"],"introduced":["1.4.0"],"last_affected":[],"package":"github.com/ecnepsnai/web","purl":null,"source":"GHSA-5gjg-jgh4-gppm"},{"ecosystem":"Go","fixed":["1.5.2"],"introduced":["1.4.0"],"last_affected":[],"package":"github.com/ecnepsnai/web","purl":"pkg:golang/github.com/ecnepsnai/web","source":"GHSA-5gjg-jgh4-gppm"},{"ecosystem":"Go","fixed":["1.5.2"],"introduced":["1.4.0"],"last_affected":[],"package":"github.com/ecnepsnai/web","purl":null,"source":"GHSA-jpgg-cp2x-qrw3"},{"ecosystem":"Go","fixed":["1.5.2"],"introduced":["1.4.0"],"last_affected":[],"package":"github.com/ecnepsnai/web","purl":"pkg:golang/github.com/ecnepsnai/web","source":"GHSA-jpgg-cp2x-qrw3"},{"ecosystem":"Go","fixed":["1.5.2"],"introduced":["1.4.0"],"last_affected":[],"package":"github.com/ecnepsnai/web","purl":"pkg:golang/github.com/ecnepsnai/web","source":"GO-2021-0107"}],"prev":{"headline":"Denial of service in gopkg.in/yaml.v2","id":"CVE-2021-4235"},"products":["github.com/ecnepsnai/web"],"published":"2022-12-27","related":[],"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":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2025-04-11","vendors":["github.com/ecnepsnai/web"]},"summary":"Attackers can bypass authentication or cause a panic in WebSocket connections if an AuthenticateMethod hook is configured.","url":"https://insights.sbomify.com/CVE-2021-4236/"}