Intel/AIKIDO-2026-10923
starlette
AIKIDO-2026-10923
starlette is vulnerable to Improper Input Validation
Improper Input ValidationCVE-2026-48710 Published 2 days ago
95
Critical Risk
This Affects:
starlette0.8.3 - 1.0.0
Fixed in 1.0.1Are you affected? Scan for Free
TL;DR
Affected versions are vulnerable to improper Host header validation when reconstructing request.url. A crafted Host header containing path or query delimiters can cause request.url.path to differ from the actual requested path, potentially allowing attackers to bypass path-based security checks or authorization middleware.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
starlette is vulnerable to Improper Input Validation in versions 0.8.3 - 1.0.0.
How to fix this
Upgrade the starlette library to the patch version.
Links
GitHub Release
Other
badhost.orghttps://badhost.org
github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yamlhttps://github.com/pypa/advisory-database/tree/main/vulns/starlette/PYSEC-2026-161.yaml
ostif.org/disclosing-the-badhost-vulnerability-in-starlettehttps://ostif.org/disclosing-the-badhost-vulnerability-in-starlette
secwest.net/starlettehttps://www.secwest.net/starlette
x41-dsec.de/lab/advisories/x41-2026-002-starlettehttps://www.x41-dsec.de/lab/advisories/x41-2026-002-starlette
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SOC 2Compliant
ISO 27001Compliant