{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-48710", "tracking": { "current_release_date": "2026-05-29T19:09:01.520553Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-48710", "initial_release_date": "2026-05-23T12:44:33.212763Z", "revision_history": [ { "date": "2026-05-23T12:44:33.212763Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Products connected (2)." }, { "date": "2026-05-23T12:44:43.570777Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-05-26T18:35:45.262814Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (6)." }, { "date": "2026-05-26T18:58:40.101613Z", "number": "4", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (13).| Product Identifiers created (9).| References created (6)." }, { "date": "2026-05-26T22:26:55.032797Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (7).| CWES updated (1)." }, { "date": "2026-05-26T22:26:57.700063Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-05-26T22:46:58.413320Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (7).| CWES updated (1)." }, { "date": "2026-05-26T22:46:59.808156Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-05-27T06:44:57.017041Z", "number": "9", "summary": "Description created for source." }, { "date": "2026-05-27T13:30:21.186897Z", "number": "10", "summary": "Source created.| CVE status created. (valid)| News created (1)." }, { "date": "2026-05-27T13:30:25.216778Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-05-27T15:51:29.170648Z", "number": "12", "summary": "Unknown change." }, { "date": "2026-05-27T16:49:35.230957Z", "number": "13", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-05-27T16:49:42.710375Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-05-28T00:45:10.110782Z", "number": "15", "summary": "Products connected (1).| Product Identifiers created (1).| Products removed (1)." }, { "date": "2026-05-28T01:21:21.805621Z", "number": "16", "summary": "Description removed for source.| Description created for source.| CVSS created." }, { "date": "2026-05-29T19:08:54.295021Z", "number": "17", "summary": "Source connected.| CVE status created. (valid)" }, { "date": "2026-05-29T19:08:57.432023Z", "number": "18", "summary": "NCSC Score updated." } ], "status": "interim", "version": "18" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/0.26.1-1+deb12u1", "product": { "name": "vers:deb/0.26.1-1+deb12u1", "product_id": "CSAFPID-7840037", "product_identification_helper": { "purl": "pkg:deb/debian/starlette@0.26.1-1+deb12u1?distro=bookworm" } } } ], "category": "product_name", "name": "starlette" } ], "category": "product_family", "name": "bookworm" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:deb/unknown", "product": { "name": "vers:deb/unknown", "product_id": "CSAFPID-1401265" } } ], "category": "product_name", "name": "starlette" } ], "category": "product_family", "name": "bullseye" } ], "category": "vendor", "name": "Debian" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<1.0.1", "product": { "name": "vers:unknown/<1.0.1", "product_id": "CSAFPID-7762914" } } ], "category": "product_name", "name": "starlette" } ], "category": "vendor", "name": "Kludex" }, { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/0.14.1-1", "product": { "name": "vers:unknown/0.14.1-1", "product_id": "CSAFPID-7762046", "product_identification_helper": { "purl": "pkg:deb/ubuntu/starlette@0.14.1-1?arch=source&distro=jammy" } } }, { "category": "product_version_range", "name": "vers:unknown/0.16.0-1", "product": { "name": "vers:unknown/0.16.0-1", "product_id": "CSAFPID-7762047", "product_identification_helper": { "purl": "pkg:deb/ubuntu/starlette@0.16.0-1?arch=source&distro=jammy" } } }, { "category": "product_version_range", "name": "vers:unknown/0.18.0-1", "product": { "name": "vers:unknown/0.18.0-1", "product_id": "CSAFPID-7762048", "product_identification_helper": { "purl": "pkg:deb/ubuntu/starlette@0.18.0-1?arch=source&distro=jammy" } } }, { "category": "product_version_range", "name": "vers:unknown/>=0", "product": { "name": "vers:unknown/>=0", "product_id": "CSAFPID-7762049" } } ], "category": "product_name", "name": "starlette" } ], "category": "product_family", "name": "Ubuntu:22.04:LTS" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/0.30.0-1", "product": { "name": "vers:unknown/0.30.0-1", "product_id": "CSAFPID-7762050", "product_identification_helper": { "purl": "pkg:deb/ubuntu/starlette@0.30.0-1?arch=source&distro=noble" } } }, { "category": "product_version_range", "name": "vers:unknown/0.31.1-1", "product": { "name": "vers:unknown/0.31.1-1", "product_id": "CSAFPID-7762051", "product_identification_helper": { "purl": "pkg:deb/ubuntu/starlette@0.31.1-1?arch=source&distro=noble" } } }, { "category": "product_version_range", "name": "vers:unknown/>=0", "product": { "name": "vers:unknown/>=0", "product_id": "CSAFPID-7762052" } } ], "category": "product_name", "name": "starlette" } ], "category": "product_family", "name": "Ubuntu:24.04:LTS" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/0.46.1-2", "product": { "name": "vers:unknown/0.46.1-2", "product_id": "CSAFPID-7762053", "product_identification_helper": { "purl": "pkg:deb/ubuntu/starlette@0.46.1-2?arch=source&distro=questing" } } }, { "category": "product_version_range", "name": "vers:unknown/0.46.1-3", "product": { "name": "vers:unknown/0.46.1-3", "product_id": "CSAFPID-7762054", "product_identification_helper": { "purl": "pkg:deb/ubuntu/starlette@0.46.1-3?arch=source&distro=questing" } } }, { "category": "product_version_range", "name": "vers:unknown/>=0", "product": { "name": "vers:unknown/>=0", "product_id": "CSAFPID-7762055" } } ], "category": "product_name", "name": "starlette" } ], "category": "product_family", "name": "Ubuntu:25.10" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/0.46.1-3", "product": { "name": "vers:unknown/0.46.1-3", "product_id": "CSAFPID-7762056", "product_identification_helper": { "purl": "pkg:deb/ubuntu/starlette@0.46.1-3?arch=source&distro=resolute" } } }, { "category": "product_version_range", "name": "vers:unknown/0.50.0-1", "product": { "name": "vers:unknown/0.50.0-1", "product_id": "CSAFPID-7762057", "product_identification_helper": { "purl": "pkg:deb/ubuntu/starlette@0.50.0-1?arch=source&distro=resolute" } } }, { "category": "product_version_range", "name": "vers:unknown/>=0", "product": { "name": "vers:unknown/>=0", "product_id": "CSAFPID-7762058" } } ], "category": "product_name", "name": "starlette" } ], "category": "product_family", "name": "Ubuntu:26.04:LTS" } ], "category": "vendor", "name": "Ubuntu" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-48710", "cwe": { "id": "CWE-444", "name": "Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')" }, "notes": [ { "category": "description", "text": "Starlette reconstructs the requested URL based on the HTTP Host request header and requested path, but does not perform any validation of the Host header value. This allows attackers to inject paths into the host part, prepending the actual path. However, routing in Starlette is based on the actual request path. This inconsistent interpretation of HTTP requests may lead to issues such as authentication bypass when the authentication depends on the reconstructed URL’s path.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/PyPI%2FPYSEC-2026-161.json?alt=media" }, { "category": "description", "text": "Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not validated before being used to reconstruct `request.url`. Because the routing algorithm relies on the raw HTTP path while `request.url` is rebuilt from the `Host` header, a malformed header could make `request.url.path` differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on `request.url` (rather than the raw `scope` path) could therefore be bypassed. Users should upgrade to a version greater than or equal to version 1.0.1, which validates the `Host` header against the grammar of RFC 9112 §3.2 / RFC 3986 §3.2.2 when constructing `request.url` and falls back to `scope[\"server\"]` for malformed values.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-48710" }, { "category": "description", "text": "Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not validated before being used to reconstruct `request.url`. Because the routing algorithm relies on the raw HTTP path while `request.url` is rebuilt from the `Host` header, a malformed header could make `request.url.path` differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on `request.url` (rather than the raw `scope` path) could therefore be bypassed. Users should upgrade to a version greater than or equal to version 1.0.1, which validates the `Host` header against the grammar of RFC 9112 §3.2 / RFC 3986 §3.2.2 when constructing `request.url` and falls back to `scope[\"server\"]` for malformed values.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/48xxx/CVE-2026-48710.json" }, { "category": "description", "text": "Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not validated before being used to reconstruct `request.url`. Because the routing algorithm relies on the raw HTTP path while `request.url` is rebuilt from the `Host` header, a malformed header could make `request.url.path` differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on `request.url` (rather than the raw `scope` path) could therefore be bypassed. Users should upgrade to a version greater than or equal to version 1.0.1, which validates the `Host` header against the grammar of RFC 9112 §3.2 / RFC 3986 §3.2.2 when constructing `request.url` and falls back to `scope[\"server\"]` for malformed values.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-48710" }, { "category": "description", "text": "Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not validated before being used to reconstruct `request.url`. Because the routing algorithm relies on the raw HTTP path while `request.url` is rebuilt from the `Host` header, a malformed header could make `request.url.path` differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on `request.url` (rather than the raw `scope` path) could therefore be bypassed. Users should upgrade to a version greater than or equal to version 1.0.1, which validates the `Host` header against the grammar of RFC 9112 §3.2 / RFC 3986 §3.2.2 when constructing `request.url` and falls back to `scope[\"server\"]` for malformed values.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Ubuntu%2FUBUNTU-CVE-2026-48710.json?alt=media" }, { "category": "other", "text": "0.00034", "title": "EPSS" }, { "category": "other", "text": "4.3", "title": "NCSC Score" }, { "category": "other", "text": "The value of the most recent EPSS score, There is cwe data available from source Nvd, Is related to (a version of) an uncommon product", "title": "NCSC Score top decreasing factors" } ], "product_status": { "first_fixed": [ "CSAFPID-7840037" ], "known_affected": [ "CSAFPID-1401265", "CSAFPID-7762046", "CSAFPID-7762047", "CSAFPID-7762048", "CSAFPID-7762049", "CSAFPID-7762050", "CSAFPID-7762051", "CSAFPID-7762052", "CSAFPID-7762053", "CSAFPID-7762054", "CSAFPID-7762055", "CSAFPID-7762056", "CSAFPID-7762057", "CSAFPID-7762058", "CSAFPID-7762914" ] }, "references": [ { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-48710" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-48710" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/PyPI%2FPYSEC-2026-161.json?alt=media" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Ubuntu%2FUBUNTU-CVE-2026-48710.json?alt=media" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/48xxx/CVE-2026-48710.json" }, { "category": "external", "summary": "Source - securitynl", "url": "https://www.security.nl/posting/938275/Miljoenen+AI-agents+en+-tools+kwetsbaar+door+beveiligingslek+in+Starlette?channel=rss" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - ncscclear", "url": "https://advisories.ncsc.nl/advisory?id=NCSC-2026-0171" }, { "category": "external", "summary": "News - securitynl", "url": "https://www.security.nl/posting/938275/Miljoenen+AI-agents+en+-tools+kwetsbaar+door+beveiligingslek+in+Starlette?channel=rss" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; osv", "url": "https://badhost.org/" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; osv", "url": "https://www.secwest.net/starlette" }, { "category": "external", "summary": "Reference - osv", "url": "https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette/" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; osv", "url": "https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr" }, { "category": "external", "summary": "Reference - osv", "url": "https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette/" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd; osv", "url": "https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6" }, { "category": "external", "summary": "Reference - osv", "url": "https://ubuntu.com/security/CVE-2026-48710" }, { "category": "external", "summary": "Reference - osv", "url": "https://www.cve.org/CVERecord?id=CVE-2026-48710" }, { "category": "external", "summary": "Reference - osv", "url": "https://x41-dsec.de/lab/advisories/x41-2026-002-starlette/" }, { "category": "external", "summary": "Reference - osv", "url": "https://github.com/Kludex/starlette/pull/3279" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1401265", "CSAFPID-7762046", "CSAFPID-7762047", "CSAFPID-7762048", "CSAFPID-7762049", "CSAFPID-7762050", "CSAFPID-7762051", "CSAFPID-7762052", "CSAFPID-7762053", "CSAFPID-7762054", "CSAFPID-7762055", "CSAFPID-7762056", "CSAFPID-7762057", "CSAFPID-7762058", "CSAFPID-7762914" ] } ], "title": "CVE-2026-48710" } ] }