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CVE-2026-48818

7.5 · HIGH

Starlette is a lightweight ASGI framework/toolkit.

Published Jun 17, 2026CWE-918EPSS 0.65%

Overview

CVE-2026-48818 is a high-severity vulnerability. It was published on June 17, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/Kludex/starlette/commit/fd53168a7767b6b55ba5af787fd88f49e33cabc5GitHubgithub.com/Kludex/starlette/pull/3287GitHubgithub.com/Kludex/starlette/releases/tag/1.1.0GitHubgithub.com/Kludex/starlette/security/advisories/GHSA-wqp7-x3pw-xc5rGitHubgithub.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-2281.yamlRefaccess.redhat.com/errata/RHSA-2026:30087Refaccess.redhat.com/errata/RHSA-2026:30088Refaccess.redhat.com/errata/RHSA-2026:30089Refaccess.redhat.com/security/cve/CVE-2026-48818Refbugzilla.redhat.com/show_bug.cgi?id=2490020

How CyberStrike helps

Frequently asked questions

What is CVE-2026-48818?

CVE-2026-48818 is a high-severity vulnerability. It was published on June 17, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-48818?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-48818?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-48818?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-48818 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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