{"id":"CVE-2026-57209","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-57209","generatedAt":"2026-10-28T03:32:11.640Z","title":"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…","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.","published":"2026-10-23T13:17:12.000Z","lastModified":"2026-10-23T19:57:43.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":7,"severity":"HIGH","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-20","CWE-74"],"affected":[],"epss":{"score":0.00336,"percentile":0.26801,"date":"2026-10-27","history":[{"date":"2026-10-24","score":0.00461,"percentile":0.39045}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-23T13:17:12.000Z","detail":{"score":"7.0","severity":"HIGH","publishedAt":"2026-10-23T13:17:11.687Z"},"summary":"New CVE, high severity (CVSS 7.0)."}],"references":[{"url":"https://github.com/dadrus/heimdall/releases/tag/v0.17.17","source":"security-advisories@github.com"},{"url":"https://github.com/dadrus/heimdall/security/advisories/GHSA-4jgr-pg2m-m988","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-57209","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}