{"answers":{"affected":"3 open source packages ship an affected version, including github.com/dadrus/heimdall.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57209 exists.","fix":"Upgrade github.com/dadrus/heimdall to 0.17.17 or later.","what":"CVE-2026-57209 is a high-severity vulnerability in dadrus heimdall, published on 23 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-57209 and fix it if it is affected.\n\nWhat it is: CVE-2026-57209 is a high-severity vulnerability in dadrus heimdall, published on 23 Oct 2026. \nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57209 exists.\n\nAffected packages and fixed versions:\n- github.com/dadrus/heimdall (Go): affected all versions; fixed in 0.17.17\n- github.com/dadrus/heimdall (Go): affected all versions; fixed in 0.17.17\n- github.com/dadrus/heimdall (Go): affected all versions; fixed in 0.17.17\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-2026-57209/ (Markdown: https://insights.sbomify.com/CVE-2026-57209/index.md)","id":"CVE-2026-57209","markdown":"https://insights.sbomify.com/CVE-2026-57209/index.md","name":"CVE-2026-57209","record":{"aliases":["GHSA-4jgr-pg2m-m988","GO-2026-5125"],"analysis":null,"analysis_generated_by":null,"assigner":"GitHub_M","cpe":[],"cvss":{"score":7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-74","name":"Improper Neutralization of Special Elements in Output Used by a Downstream Component"},{"id":"CWE-20","name":"Improper Input Validation"}],"description":"Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.17, when Heimdall operates in proxy mode, it constructs the Forwarded HTTP header after executing the matched rule pipeline by inserting the incoming request's Host header value directly into the header string without sanitizing commas or semicolons. This allows an attacker to inject additional parameters into the Forwarded header, potentially spoofing IP addresses for upstream services. This issue has been patched in version 0.17.17.","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":"Heimdall: Forwarded Header Injection via Unsanitized Host Header in Proxy Mode","id":"CVE-2026-57209","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":null,"year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"Heimdall: IP Spoofing via Unvalidated Forwarding Headers","id":"CVE-2026-57210"},"packages":[{"ecosystem":"Go","fixed":["0.17.17"],"introduced":["0"],"last_affected":[],"package":"github.com/dadrus/heimdall","purl":null,"source":"GHSA-4jgr-pg2m-m988"},{"ecosystem":"Go","fixed":["0.17.17"],"introduced":["0"],"last_affected":[],"package":"github.com/dadrus/heimdall","purl":"pkg:golang/github.com/dadrus/heimdall","source":"GHSA-4jgr-pg2m-m988"},{"ecosystem":"Go","fixed":["0.17.17"],"introduced":["0"],"last_affected":[],"package":"github.com/dadrus/heimdall","purl":"pkg:golang/github.com/dadrus/heimdall","source":"GO-2026-5125"}],"prev":{"headline":"Entire CLI: Path traversal in checkpoint session metadata allows arbitrary file write during resume/rewind","id":"CVE-2026-57208"},"products":["heimdall"],"published":"2026-10-23","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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-29","vendors":["dadrus"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-57209/"}