{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-125109", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-11-09T17:45:35.935Z", "datePublished": "2026-11-09T21:57:46.924Z", "dateUpdated": "2026-11-09T21:57:46.924Z"}, "containers": {"cna": {"title": "Rack: Rack::Request#host_with_port (and #base_url / #url) return the raw invalid Host header \u2014 incomplete fix of CVE-2026-34835", "problemTypes": [{"descriptions": [{"cweId": "CWE-1286", "lang": "en", "description": "CWE-1286: Improper Validation of Syntactic Correctness of Input", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/rack/rack/security/advisories/GHSA-2j8w-xcrc-x985", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/rack/rack/security/advisories/GHSA-2j8w-xcrc-x985"}, {"name": "https://github.com/rack/rack/commit/4380381a56dc52556a436d6d794c8e18dc8b0565", "tags": ["x_refsource_MISC"], "url": "https://github.com/rack/rack/commit/4380381a56dc52556a436d6d794c8e18dc8b0565"}, {"name": "https://github.com/rack/rack/commit/49386f460286b7346c7003b69a839de782cc8a39", "tags": ["x_refsource_MISC"], "url": "https://github.com/rack/rack/commit/49386f460286b7346c7003b69a839de782cc8a39"}, {"name": "https://github.com/rack/rack/releases/tag/v3.1.23", "tags": ["x_refsource_MISC"], "url": "https://github.com/rack/rack/releases/tag/v3.1.23"}, {"name": "https://github.com/rack/rack/releases/tag/v3.2.8", "tags": ["x_refsource_MISC"], "url": "https://github.com/rack/rack/releases/tag/v3.2.8"}], "affected": [{"vendor": "rack", "product": "rack", "versions": [{"version": ">= 3.0, < 3.1.23", "status": "affected"}, {"version": ">= 3.2, < 3.2.8", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-09T21:57:46.924Z"}, "descriptions": [{"lang": "en", "value": "Rack is a modular Ruby web server interface. From 3.0 until 3.1.23 and 3.2.8, Rack::Request#host_with_port, #base_url, and #url can return an attacker-controlled invalid authority from Host, X-Forwarded-Host, or Forwarded: host= verbatim. Applications without an independent host allowlist that use these methods for absolute URLs, redirects, or origin-dependent checks can emit attacker-chosen delimiters, enabling redirect manipulation, string-based allowlist bypass, or unescaped markup reflection. Rails overrides these methods and is not expected to be affected. This issue is fixed in versions 3.1.23 and 3.2.8."}], "source": {"advisory": "GHSA-2j8w-xcrc-x985", "discovery": "UNKNOWN"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[3.0,3.1.23)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[3.2,3.2.8)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "rack", "source": "cna", "vendor": "rack"}, "product": "rack", "vendor": "rack"}], "created": "2026-11-09T23:30:17.907645+00:00", "updated": "2026-11-09T23:30:18.549221+00:00", "vendors": ["rack", "rack$PRODUCT$rack"]}