CVE-2026-48818

Starlette is a lightweight ASGI framework/toolkit. In versions 1.0.1 and earlier, StaticFiles on Windows is vulnerable to SSRF. An UNC path such as \\attacker.com\share can cause os.path.realpath to initiate an outbound SMB connection before the path is rejected, exposing the service account’s NTLMv2 credentials for offline cracking or relay even though the HTTP response is only a 404. The issue affects default follow_symlink=False deployments, including frameworks built on Starlette such as FastAPI; POSIX systems and follow_symlink=True are unaffected. The issue is fixed in 1.1.0.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/Kludex/starlette/commit/fd53168a7767b6b55ba5af787fd88f49e33cabc5	Patch
https://github.com/Kludex/starlette/pull/3287	Patch
https://github.com/Kludex/starlette/releases/tag/1.1.0	Release Notes
https://github.com/Kludex/starlette/security/advisories/GHSA-wqp7-x3pw-xc5r	Mitigation Vendor Advisory
https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-2281.yaml
https://access.redhat.com/errata/RHSA-2026:30087
https://access.redhat.com/errata/RHSA-2026:30088
https://access.redhat.com/errata/RHSA-2026:30089
https://access.redhat.com/security/cve/CVE-2026-48818
https://bugzilla.redhat.com/show_bug.cgi?id=2490020
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48818.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:encode:starlette:*:*:*:*:*:python:*:*

History

No history.

Information

Published : 2026-06-17 19:18

Updated : 2026-08-04 19:16

NVD link : CVE-2026-48818

Mitre link : CVE-2026-48818

CVE.ORG link : CVE-2026-48818

JSON object : View

Products Affected

encode

starlette

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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"unaffected"}, {"cpes": ["cpe:/a:redhat:satellite:6"], "vendor": "Red Hat", "product": "Red Hat Satellite 6", "packageName": "satellite/iop-advisor-engine-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:satellite:6"], "vendor": "Red Hat", "product": "Red Hat Satellite 6", "packageName": "satellite/iop-host-inventory-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:satellite:6"], "vendor": "Red Hat", "product": "Red Hat Satellite 6", "packageName": "satellite/iop-vmaas-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:satellite:6"], "vendor": "Red Hat", "product": "Red Hat Satellite 6", "packageName": "satellite/iop-vulnerability-engine-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}]}], "published": "2026-06-17T19:18:09.807", "references": [{"url": "https://github.com/Kludex/starlette/commit/fd53168a7767b6b55ba5af787fd88f49e33cabc5", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/Kludex/starlette/pull/3287", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/Kludex/starlette/releases/tag/1.1.0", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/Kludex/starlette/security/advisories/GHSA-wqp7-x3pw-xc5r", "tags": ["Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-2281.yaml", "source": "security-advisories@github.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:30087", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:30088", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:30089", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-48818", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2490020", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48818.json", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-918"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-918"}]}], "descriptions": [{"lang": "en", "value": "Starlette is a lightweight ASGI framework/toolkit. In versions 1.0.1 and earlier, StaticFiles on Windows is vulnerable to SSRF. An UNC path such as \\\\attacker.com\\share can cause os.path.realpath to initiate an outbound SMB connection before the path is rejected, exposing the service account\u2019s NTLMv2 credentials for offline cracking or relay even though the HTTP response is only a 404. The issue affects default follow_symlink=False deployments, including frameworks built on Starlette such as FastAPI; POSIX systems and follow_symlink=True are unaffected. The issue is fixed in 1.1.0."}], "lastModified": "2026-08-04T19:16:51.383", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:encode:starlette:*:*:*:*:*:python:*:*", "vulnerable": true, "matchCriteriaId": "DD48D170-564B-4AAB-8092-6DE121E58626", "versionEndExcluding": "1.1.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}