{"id":"CVE-2026-57210","aliases":[],"cve":{"records":[{"id":"CVE-2026-57210","source":"GitHub_M","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-06-24T02:00:46.801Z","published":"2026-10-23T12:28:09.427Z","modified":"2026-10-29T02:57:12.693Z"}],"publishers":[{"name":"GitHub_M","role":"CNA","organizationId":"a0819718-46f1-4df5-94e2-005712e83aaa","modified":"2026-10-23T12:28:09.427Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T02:57:12.693Z"}],"references":[{"url":"https://github.com/dadrus/heimdall/security/advisories/GHSA-38x9-25wx-7fg2","tags":["x_refsource_CONFIRM"],"source":"GitHub_M"},{"url":"https://github.com/dadrus/heimdall/releases/tag/v0.17.17","tags":["x_refsource_MISC"],"source":"GitHub_M"}],"weaknesses":[{"id":"CWE-20","description":"CWE-20: Improper Input Validation","source":"GitHub_M"},{"id":"CWE-116","description":"CWE-116: Improper Encoding or Escaping of Output","source":"GitHub_M"},{"id":"CWE-290","description":"CWE-290: Authentication Bypass by Spoofing","source":"GitHub_M"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T02:57:03.506476Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Heimdall: IP Spoofing via Unvalidated Forwarding Headers","titleSource":"GitHub_M","descriptionSource":"GitHub_M","description":"Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.17, when the trusted_proxies option is configured, heimdall extracts client IP addresses from the Forwarded (for= parameter) and X-Forwarded-For headers and exposes them as Request.ClientIPAddresses to the rule pipeline. However, extracted values are not validated to be syntactically valid IP addresses. Arbitrary strings, malformed IP literals, and RFC 7239 unknown values and obfuscated identifiers are accepted without further checks. In addition, the Forwarded header parser splits on , and ; without accounting for RFC 7239 quoted strings, which can cause a single quoted value to be parsed as multiple entries, with fragments — including trailing quote characters — treated as independent addresses. This issue has been patched in version 0.17.17.","score":7,"severity":"high","published":"2026-10-23T12:28:09.427Z","modified":"2026-10-29T02:57:12.693Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"dadrus","name":"heimdall","platforms":[],"versions":[{"version":"< 0.17.17","status":"affected"}],"cpes":[],"source":"GitHub_M","url":"https://www.cve.org/CVERecord?id=CVE-2026-57210"}],"remediation":[],"references":["https://github.com/dadrus/heimdall/security/advisories/GHSA-38x9-25wx-7fg2","https://github.com/dadrus/heimdall/releases/tag/v0.17.17"],"sources":[{"name":"CVE","id":"CVE-2026-57210","modified":"2026-10-29T02:57:12.693Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-57210"}],"assessments":[{"source":"GitHub_M","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","score":7}],"sourceAffected":[],"observedAt":"2026-10-29T14:40:24.226Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T04:10:31.776Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-29T05:35:38.482Z","attemptedAt":"2026-10-29T05:35:38.482Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-29T05:35:38.392Z","attemptedAt":"2026-10-29T05:35:38.392Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-29T05:35:38.792Z","attemptedAt":"2026-10-29T05:35:38.792Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-29T05:35:38.161Z","attemptedAt":"2026-10-29T05:35:38.161Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-57210","url":"https://www.first.org/epss/","probability":0.00307,"percentile":0.23411,"date":"2026-10-28","checkedAt":"2026-10-29T05:35:38.161Z"},{"source":"GitHub Advisory Database","id":"GHSA-38x9-25wx-7fg2","url":"https://github.com/advisories/GHSA-38x9-25wx-7fg2","modified":"2026-07-20T21:28:51Z","checkedAt":"2026-10-29T05:35:38.392Z"},{"source":"NVD","id":"CVE-2026-57210","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57210","modified":"2026-10-29T04:18:39.490","score":7,"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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-10-29T05:35:38.482Z"},{"source":"ENISA EUVD","id":"EUVD-2026-108750","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-108750","modified":"Oct 29, 2026, 2:57:12 AM","score":7,"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","checkedAt":"2026-10-29T05:35:38.792Z"}],"aiSummary":{"text":"Heimdall, an Identity Aware Proxy, is vulnerable to IP spoofing via unvalidated forwarding headers in versions prior to 0.17.17, allowing arbitrary strings as client IP addresses. An attacker with access to the trusted_proxies option can exploit this weakness. The impact is authentication bypass by spoofing.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T08:55:52.308Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-57210"}]}}