Exploitation evidence
Known exploited · CISA KEV listed
Added 2026-09-02. Ransomware campaign use: Unknown.
CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA due date: 2026-09-16. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Kludex / starlette
Default status: Not specified
- affected: < 1.0.1
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
- https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr
- https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6
- https://badhost.org
- https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml
- https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette
- https://www.secwest.net/starlette
- https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette
- https:/www.microsoft.com/en-us/security/blog/2026/08/26/when-ai-infrastructure-becomes-target-securing-gateways-control-points
- https://www.wiz.io/blog/ai-infrastructure-honeypot
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-48710
- https://access.redhat.com/security/cve/CVE-2026-48710
- https://bugzilla.redhat.com/show_bug.cgi?id=2481742
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48710.json
- https://access.redhat.com/errata/RHSA-2026:30089
- https://access.redhat.com/errata/RHSA-2026:30088
- https://access.redhat.com/errata/RHSA-2026:24866
- https://access.redhat.com/errata/RHSA-2026:23346
- https://access.redhat.com/errata/RHSA-2026:43038
- https://access.redhat.com/errata/RHSA-2026:37275
- https://access.redhat.com/errata/RHSA-2026:60520
- https://access.redhat.com/errata/RHSA-2026:34456
- https://access.redhat.com/errata/RHSA-2026:44696
- https://access.redhat.com/errata/RHSA-2026:22993
- https://access.redhat.com/errata/RHSA-2026:26226
- https://access.redhat.com/errata/RHSA-2026:51357
- https://access.redhat.com/errata/RHSA-2026:22992
- https://access.redhat.com/errata/RHSA-2026:34532
- https://access.redhat.com/errata/RHSA-2026:34526
- https://access.redhat.com/errata/RHSA-2026:63337
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.70288,
"percentile": 0.99393
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.70288,
"percentile": 0.99389
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.70288,
"percentile": 0.99388
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.70288,
"percentile": 0.99388
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.70288,
"percentile": 0.99388
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.70288,
"percentile": 0.99387
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.70288,
"percentile": 0.99386
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.70288,
"percentile": 0.99385
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.70288,
"percentile": 0.99385
}03 Nov 2026, 06:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
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"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:51357"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:22992"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:34532"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:34526"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:63337"
}
],
"solutions": [
{
"lang": "en",
"value": "RHSA-2026:30089: Red Hat AI Inference Server 3.3"
},
{
"lang": "en",
"value": "RHSA-2026:30088: Red Hat AI Inference Server 3.3"
},
{
"lang": "en",
"value": "RHSA-2026:24866: Red Hat Ansible Automation Platform 2.6"
},
{
"lang": "en",
"value": "RHSA-2026:23346: Red Hat Ansible Automation Platform 2.7"
},
{
"lang": "en",
"value": "RHSA-2026:43038: Red Hat Migration Toolkit for Applications 8.2"
},
{
"lang": "en",
"value": "RHSA-2026:37275: Red Hat OpenShift AI 3.3"
},
{
"lang": "en",
"value": "RHSA-2026:60520: Red Hat OpenShift AI 3.4"
},
{
"lang": "en",
"value": "RHSA-2026:34456: Red Hat OpenShift AI 3.4"
},
{
"lang": "en",
"value": "RHSA-2026:44696: Red Hat Satellite 6.17"
},
{
"lang": "en",
"value": "RHSA-2026:22993: Red Hat Satellite 6.18"
},
{
"lang": "en",
"value": "RHSA-2026:26226: Red Hat Satellite 6.18"
},
{
"lang": "en",
"value": "RHSA-2026:51357: Red Hat Satellite 6.18"
},
{
"lang": "en",
"value": "RHSA-2026:22992: Red Hat Satellite 6.19"
},
{
"lang": "en",
"value": "RHSA-2026:34532: Red Hat Satellite 6.19"
},
{
"lang": "en",
"value": "RHSA-2026:34526: Red Hat Satellite 6.19"
},
{
"lang": "en",
"value": "RHSA-2026:63337: Red Hat Satellite 6.19"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-05-26T23:01:03.204Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-05-26T21:54:54.393Z",
"value": "Made public."
}
],
"title": "starlette: Starlette: Security restriction bypass via malformed HTTP Host header",
"workarounds": [
{
"lang": "en",
"value": "Deploying an RFC-compliant reverse proxy (such as nginx, Apache, HAProxy, or Caddy) in front of the ASGI server will reject malformed Host headers before they reach the application. This is the most straightforward mitigation that does not require code changes.\n\nIf custom middleware is present, it should be updated to use `request.scope[\"path\"]` instead of `request.url.path` for any security decisions. The ASGI scope path is derived from the HTTP request line and is not influenced by the Host header, so it reflects the actual request target."
}
],
"x_adpType": "supplier",
"x_generator": {
"engine": "sadp-cli 1.0.0"
}
}
],
"cna": {
"affected": [
{
"product": "starlette",
"vendor": "Kludex",
"versions": [
{
"status": "affected",
"version": "< 1.0.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-444",
"description": "CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-26T21:54:54.393Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr"
},
{
"name": "https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6"
},
{
"name": "https://badhost.org",
"tags": [
"x_refsource_MISC"
],
"url": "https://badhost.org"
},
{
"name": "https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml"
},
{
"name": "https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette",
"tags": [
"x_refsource_MISC"
],
"url": "https://ostif.org/disclosing-the-badhost-vulnerability-in-starlette"
},
{
"name": "https://www.secwest.net/starlette",
"tags": [
"x_refsource_MISC"
],
"url": "https://www.secwest.net/starlette"
},
{
"name": "https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette",
"tags": [
"x_refsource_MISC"
],
"url": "https://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette"
}
],
"source": {
"advisory": "GHSA-86qp-5c8j-p5mr",
"discovery": "UNKNOWN"
},
"title": "Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-48710",
"datePublished": "2026-05-26T21:54:54.393Z",
"dateReserved": "2026-05-22T18:47:27.755Z",
"dateUpdated": "2026-10-01T17:41:26.242Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.70288,
"percentile": 0.99383
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2026-48710",
"cwes": [
"CWE-444"
],
"dateAdded": "2026-09-02",
"dueDate": "2026-09-16",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mr ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-48710",
"product": "Starlette",
"requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
"shortDescription": "Kludex Starlette contains a HTTP request/response smuggling vulnerability that could allow attackers to inject paths into the host part, prepending the actual path leading to issues such as authentication bypass when the authentication depends on the reconstructed URL’s path. This vulnerability could be chaned with CVE-2026-42271.",
"vendorProject": "Kludex",
"vulnerabilityName": "Kludex Starlette HTTP Request/Response Smuggling Vulnerability"
}