{"api_version":"1","generated_at":"2026-08-03T23:16:51+00:00","cve":"CVE-2026-69246","urls":{"html":"https://cve.report/CVE-2026-69246","api":"https://cve.report/api/cve/CVE-2026-69246.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-69246","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-69246"},"summary":{"title":"Guzzle: Noncanonical host can bypass host-based checks","description":"Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, Guzzle gives a transport the request URI as text and supplies the Host header separately. The cURL handlers set CURLOPT_URL to the URI exactly as written and push that Host into CURLOPT_HTTPHEADER; StreamHandler does the same through fopen(). libcurl then parses the authority itself, percent-decoding it and, on an IDN-capable build, applying IDNA mapping, and uses the result to resolve, connect, name the TLS peer and address a proxy CONNECT, while the supplied Host suppresses the aligned one libcurl would have generated. For a URI host written as 127.0.0.%31, filter_var() rejects the host as an IP literal, yet libcurl decodes it to 127.0.0.1 and reaches loopback with no DNS lookup while the server receives Host: 127.0.0.%31. An attacker who influences a fetched URI can therefore reach a host the application's checks excluded and read whatever the host exposes of the response. The same divergence moves Guzzle's own decisions onto a spelling the transport does not use: no_proxy selects proxy routing from the literal host, and RedirectMiddleware decides from it whether to strip Authorization and Cookie. Exploitation requires the application to build a request URI from untrusted input and to make a host decision before handing it to Guzzle. This issue is fixed in versions 7.15.2 and 8.0.1.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-08-03 21:16:42","updated_at":"2026-08-03 21:16:42"},"problem_types":["CWE-180","CWE-436","CWE-918","CWE-941","CWE-180 CWE-180: Incorrect Behavior Order: Validate Before Canonicalize","CWE-436 CWE-436: Interpretation Conflict","CWE-918 CWE-918: Server-Side Request Forgery (SSRF)","CWE-941 CWE-941: Incorrectly Specified Destination in a Communication Channel"],"metrics":[{"version":"3.1","source":"security-advisories@github.com","type":"Secondary","score":"7.2","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","baseScore":7.2,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.2","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","version":"3.1"}}],"references":[{"url":"https://github.com/guzzle/guzzle/commit/744101956d78b7c1384d0cbf379db13e859167bf","name":"https://github.com/guzzle/guzzle/commit/744101956d78b7c1384d0cbf379db13e859167bf","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/guzzle/guzzle/pull/3907","name":"https://github.com/guzzle/guzzle/pull/3907","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/guzzle/guzzle/releases/tag/7.15.2","name":"https://github.com/guzzle/guzzle/releases/tag/7.15.2","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/guzzle/guzzle/releases/tag/8.0.1","name":"https://github.com/guzzle/guzzle/releases/tag/8.0.1","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/guzzle/guzzle/commit/3aeea0406aab88cbbd86531313d7cebf8ae149a4","name":"https://github.com/guzzle/guzzle/commit/3aeea0406aab88cbbd86531313d7cebf8ae149a4","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-v5mv-p594-2x33","name":"https://github.com/guzzle/guzzle/security/advisories/GHSA-v5mv-p594-2x33","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/guzzle/guzzle/pull/3908","name":"https://github.com/guzzle/guzzle/pull/3908","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-69246","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-69246","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"guzzle","product":"guzzle","version":"affected >= 8.0.0, < 8.0.1","platforms":[]},{"source":"CNA","vendor":"guzzle","product":"guzzle","version":"affected < 7.15.2","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"guzzle","vendor":"guzzle","versions":[{"status":"affected","version":">= 8.0.0, < 8.0.1"},{"status":"affected","version":"< 7.15.2"}]}],"descriptions":[{"lang":"en","value":"Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, Guzzle gives a transport the request URI as text and supplies the Host header separately. The cURL handlers set CURLOPT_URL to the URI exactly as written and push that Host into CURLOPT_HTTPHEADER; StreamHandler does the same through fopen(). libcurl then parses the authority itself, percent-decoding it and, on an IDN-capable build, applying IDNA mapping, and uses the result to resolve, connect, name the TLS peer and address a proxy CONNECT, while the supplied Host suppresses the aligned one libcurl would have generated. For a URI host written as 127.0.0.%31, filter_var() rejects the host as an IP literal, yet libcurl decodes it to 127.0.0.1 and reaches loopback with no DNS lookup while the server receives Host: 127.0.0.%31. An attacker who influences a fetched URI can therefore reach a host the application's checks excluded and read whatever the host exposes of the response. The same divergence moves Guzzle's own decisions onto a spelling the transport does not use: no_proxy selects proxy routing from the literal host, and RedirectMiddleware decides from it whether to strip Authorization and Cookie. Exploitation requires the application to build a request URI from untrusted input and to make a host decision before handing it to Guzzle. This issue is fixed in versions 7.15.2 and 8.0.1."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-180","description":"CWE-180: Incorrect Behavior Order: Validate Before Canonicalize","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-436","description":"CWE-436: Interpretation Conflict","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-941","description":"CWE-941: Incorrectly Specified Destination in a Communication Channel","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-03T21:07:04.228Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/guzzle/guzzle/security/advisories/GHSA-v5mv-p594-2x33","tags":["x_refsource_CONFIRM"],"url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-v5mv-p594-2x33"},{"name":"https://github.com/guzzle/guzzle/pull/3907","tags":["x_refsource_MISC"],"url":"https://github.com/guzzle/guzzle/pull/3907"},{"name":"https://github.com/guzzle/guzzle/pull/3908","tags":["x_refsource_MISC"],"url":"https://github.com/guzzle/guzzle/pull/3908"},{"name":"https://github.com/guzzle/guzzle/commit/3aeea0406aab88cbbd86531313d7cebf8ae149a4","tags":["x_refsource_MISC"],"url":"https://github.com/guzzle/guzzle/commit/3aeea0406aab88cbbd86531313d7cebf8ae149a4"},{"name":"https://github.com/guzzle/guzzle/commit/744101956d78b7c1384d0cbf379db13e859167bf","tags":["x_refsource_MISC"],"url":"https://github.com/guzzle/guzzle/commit/744101956d78b7c1384d0cbf379db13e859167bf"},{"name":"https://github.com/guzzle/guzzle/releases/tag/7.15.2","tags":["x_refsource_MISC"],"url":"https://github.com/guzzle/guzzle/releases/tag/7.15.2"},{"name":"https://github.com/guzzle/guzzle/releases/tag/8.0.1","tags":["x_refsource_MISC"],"url":"https://github.com/guzzle/guzzle/releases/tag/8.0.1"}],"source":{"advisory":"GHSA-v5mv-p594-2x33","discovery":"UNKNOWN"},"title":"Guzzle: Noncanonical host can bypass host-based checks"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-69246","datePublished":"2026-08-03T21:07:04.228Z","dateReserved":"2026-08-03T19:54:19.852Z","dateUpdated":"2026-08-03T21:07:04.228Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-03 21:16:42","lastModifiedDate":"2026-08-03 21:16:42","problem_types":["CWE-180","CWE-436","CWE-918","CWE-941","CWE-180 CWE-180: Incorrect Behavior Order: Validate Before Canonicalize","CWE-436 CWE-436: Interpretation Conflict","CWE-918 CWE-918: Server-Side Request Forgery (SSRF)","CWE-941 CWE-941: Incorrectly Specified Destination in a Communication Channel"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","baseScore":7.2,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":2.7}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"69246","Ordinal":"1","Title":"Guzzle: Noncanonical host can bypass host-based checks","CVE":"CVE-2026-69246","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"69246","Ordinal":"1","NoteData":"Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, Guzzle gives a transport the request URI as text and supplies the Host header separately. The cURL handlers set CURLOPT_URL to the URI exactly as written and push that Host into CURLOPT_HTTPHEADER; StreamHandler does the same through fopen(). libcurl then parses the authority itself, percent-decoding it and, on an IDN-capable build, applying IDNA mapping, and uses the result to resolve, connect, name the TLS peer and address a proxy CONNECT, while the supplied Host suppresses the aligned one libcurl would have generated. For a URI host written as 127.0.0.%31, filter_var() rejects the host as an IP literal, yet libcurl decodes it to 127.0.0.1 and reaches loopback with no DNS lookup while the server receives Host: 127.0.0.%31. An attacker who influences a fetched URI can therefore reach a host the application's checks excluded and read whatever the host exposes of the response. The same divergence moves Guzzle's own decisions onto a spelling the transport does not use: no_proxy selects proxy routing from the literal host, and RedirectMiddleware decides from it whether to strip Authorization and Cookie. Exploitation requires the application to build a request URI from untrusted input and to make a host decision before handing it to Guzzle. This issue is fixed in versions 7.15.2 and 8.0.1.","Type":"Description","Title":"Guzzle: Noncanonical host can bypass host-based checks"}]}}}