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CVE-2026-48710

6.5 · MEDIUM

Starlette is a lightweight ASGI framework/toolkit.

Published May 26, 2026CWE-444EPSS 7.06%

Overview

CVE-2026-48710 is a medium-severity vulnerability. It was published on May 26, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. 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. 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.

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

Refbadhost.orgGitHubgithub.com/Kludex/starlette/commit/764dab0dcfb9033d75442d7a359645c9f94648c6GitHubgithub.com/Kludex/starlette/security/advisories/GHSA-86qp-5c8j-p5mrGitHubgithub.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yamlRefostif.org/disclosing-the-badhost-vulnerability-in-starletteRefwww.secwest.net/starletteRefwww.x41-dsec.de/lab/advisories/x41-2026-002-starletteRefaccess.redhat.com/errata/RHSA-2026:22992Refaccess.redhat.com/errata/RHSA-2026:22993Refaccess.redhat.com/errata/RHSA-2026:23346

How CyberStrike helps

Frequently asked questions

What is CVE-2026-48710?

CVE-2026-48710 is a medium-severity vulnerability. It was published on May 26, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-48710?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-48710?

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-2026-48710?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-48710 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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