{"answers":{"affected":"3 open source packages ship an affected version, including github.com/dadrus/heimdall.","exploited":"There is no known exploitation of CVE-2026-42273 in the wild and no public exploit code.","fix":"Upgrade github.com/dadrus/heimdall to 0.17.14 or later.","what":"CVE-2026-42273 is a high-severity authentication bypass vulnerability in dadrus heimdall, 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-2026-42273 and fix it if it is affected.\n\nWhat it is: CVE-2026-42273 is a high-severity authentication bypass vulnerability in dadrus heimdall, 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-2026-42273 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/dadrus/heimdall (Go): affected all versions; fixed in 0.17.14\n- github.com/dadrus/heimdall (Go): affected all versions; fixed in 0.17.14\n- github.com/dadrus/heimdall (Go): affected all versions; fixed in 0.17.14\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-2026-42273/ (Markdown: https://insights.sbomify.com/CVE-2026-42273/index.md)","id":"CVE-2026-42273","markdown":"https://insights.sbomify.com/CVE-2026-42273/index.md","name":"CVE-2026-42273","record":{"aliases":["GHSA-72h4-mxfc-jx37","GO-2026-5200"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Identity Aware Proxy","requires_auth":"none","summary":"Attackers can bypass access control policies by exploiting case-sensitive host matching in Heimdall, allowing unauthorized access to protected resources.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-436","name":"Interpretation Conflict"},{"id":"CWE-178","name":"Improper Handling of Case Sensitivity"}],"description":"Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs host matching in a case-sensitive manner, while HTTP hostnames are case-insensitive. This discrepancy can result in heimdall failing to match a rule for a request host that differs only in letter casing, potentially causing the request to be classified differently than intended. This issue has been patched in version 0.17.14.","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":"Heimdall: Case-sensitive host matching may lead to policy bypass","id":"CVE-2026-42273","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":3,"n_references":4,"next":{"headline":"Heimdall: Authorization bypass via path normalization mismatch","id":"CVE-2026-42274"},"packages":[{"ecosystem":"Go","fixed":["0.17.14"],"introduced":["0"],"last_affected":[],"package":"github.com/dadrus/heimdall","purl":null,"source":"GHSA-72h4-mxfc-jx37"},{"ecosystem":"Go","fixed":["0.17.14"],"introduced":["0"],"last_affected":[],"package":"github.com/dadrus/heimdall","purl":"pkg:golang/github.com/dadrus/heimdall","source":"GHSA-72h4-mxfc-jx37"},{"ecosystem":"Go","fixed":["0.17.14"],"introduced":["0"],"last_affected":[],"package":"github.com/dadrus/heimdall","purl":"pkg:golang/github.com/dadrus/heimdall","source":"GO-2026-5200"}],"prev":{"headline":"Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path interpretation","id":"CVE-2026-42272"},"products":["heimdall"],"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-08","vendors":["dadrus"]},"summary":"Attackers can bypass access control policies by exploiting case-sensitive host matching in Heimdall, allowing unauthorized access to protected resources.","url":"https://insights.sbomify.com/CVE-2026-42273/"}