{"answers":{"affected":"3 open source packages ship an affected version, including github.com/jkroepke/openvpn-auth-oauth2.","exploited":"There is no known exploitation of CVE-2026-41070 in the wild and no public exploit code.","fix":"Upgrade github.com/jkroepke/openvpn-auth-oauth2 to 1.27.3 or later.","what":"CVE-2026-41070 is a critical authentication bypass vulnerability in jkroepke openvpn-auth-oauth2, published on 8 May 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-2026-41070 and fix it if it is affected.\n\nWhat it is: CVE-2026-41070 is a critical authentication bypass vulnerability in jkroepke openvpn-auth-oauth2, published on 8 May 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-2026-41070 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/jkroepke/openvpn-auth-oauth2 (Go): affected from 1.26.3; fixed in 1.27.3\n- github.com/jkroepke/openvpn-auth-oauth2 (Go): affected from 1.26.3; fixed in 1.27.3\n- github.com/jkroepke/openvpn-auth-oauth2 (Go): affected from 1.26.3; fixed in 1.27.3\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-2026-41070/ (Markdown: https://insights.sbomify.com/CVE-2026-41070/index.md)","id":"CVE-2026-41070","markdown":"https://insights.sbomify.com/CVE-2026-41070/index.md","name":"CVE-2026-41070","record":{"aliases":["DEBIAN-CVE-2026-41070","GHSA-246w-jgmq-88fg","GO-2026-4963","UBUNTU-CVE-2026-41070"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["privilege_escalation","security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"OpenVPN authentication plugin","requires_auth":"none","summary":"Attackers can bypass authentication and gain unauthenticated VPN access when using the experimental plugin mode in openvpn-auth-oauth2.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":10,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-287","name":"Improper Authentication"}],"description":"openvpn-auth-oauth2 is a plugin/management interface client for OpenVPN server to handle an OIDC based single sign-on (SSO) auth flows. From version 1.26.3 to before version 1.27.3, when openvpn-auth-oauth2 is deployed in the experimental plugin mode (shared library loaded by OpenVPN via the plugin directive), clients that do not support WebAuth/SSO (e.g., the openvpn CLI on Linux) are incorrectly admitted to the VPN despite being denied by the authentication logic. The default management-interface mode is not affected because it does not use the OpenVPN plugin return-code mechanism. This issue has been patched in version 1.27.3.","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":"openvpn-auth-oauth2 returns FUNC_SUCCESS on client-deny, allowing unauthenticated VPN access","id":"CVE-2026-41070","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"libheif: Heap buffer over-read in SampleAuxInfoReader via crafted HEIF sequence file with mismatched saiz sample count","id":"CVE-2026-41071"},"packages":[{"ecosystem":"Go","fixed":["1.27.3"],"introduced":["1.26.3"],"last_affected":[],"package":"github.com/jkroepke/openvpn-auth-oauth2","purl":null,"source":"GHSA-246w-jgmq-88fg"},{"ecosystem":"Go","fixed":["1.27.3"],"introduced":["1.26.3"],"last_affected":[],"package":"github.com/jkroepke/openvpn-auth-oauth2","purl":"pkg:golang/github.com/jkroepke/openvpn-auth-oauth2","source":"GHSA-246w-jgmq-88fg"},{"ecosystem":"Go","fixed":["1.27.3"],"introduced":["1.26.3"],"last_affected":[],"package":"github.com/jkroepke/openvpn-auth-oauth2","purl":"pkg:golang/github.com/jkroepke/openvpn-auth-oauth2","source":"GO-2026-4963"}],"prev":{"headline":"libheif allows Out-of-bounds vector access leading to invalid dereference (DoS)","id":"CVE-2026-41069"},"products":["openvpn-auth-oauth2"],"published":"2026-05-08","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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-05-08","vendors":["jkroepke"]},"summary":"Attackers can bypass authentication and gain unauthenticated VPN access when using the experimental plugin mode in openvpn-auth-oauth2.","url":"https://insights.sbomify.com/CVE-2026-41070/"}