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CVE-2026-25479

CVE-2026-25479 · Litestar has an AllowedHosts validation bypass due to unescaped regex metacharacters in configured host patterns

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.20.0, in litestar.middleware.allowed_hosts, allowlist entries are compiled into regex patterns in a way that allows regex metacharacters to retain special meaning (e.g., . matches any character). This enables a bypass where an attacker supplies a host that matches the regex but is not the intended literal hostname. This vulnerability is fixed in 2.20.0.

CVSS 6.5 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • litestar

    Versions
    • < 2.20.0: Affected

    No fix published

  • litestar PyPI

    Versions
    • 2.19.0
    Affected ranges
    • ECOSYSTEM: ≥ 2.19.0, < 2.20.0

    Update to 2.20.0

  • litestar PyPI

    Versions
    • 1.0.0a0
    • 2.0.0
    • 2.0.0a3
    • 2.0.0a4
    • 2.0.0a5
    • 2.0.0a6
    • 2.0.0a7
    • 2.0.0b1
    • 2.0.0b2
    • 2.0.0b3
    • 2.0.0b4
    • 2.0.0rc1
    • 2.0.1
    • 2.1.0
    • 2.1.1
    • 2.10.0
    • 2.11.0
    • 2.12.0
    • 2.12.1
    • 2.13.0
    • 2.14.0
    • 2.15.0
    • 2.15.1
    • 2.15.2
    • 2.16.0
    • 2.17.0
    • 2.18.0
    • 2.19.0
    • 2.2.0
    • 2.2.1
    • 2.3.0
    • 2.3.1
    • 2.3.2
    • 2.4.0
    • 2.4.1
    • 2.4.2
    • 2.4.3
    • 2.4.4
    • 2.4.5
    • 2.5.0
    • 2.5.1
    • 2.5.2
    • 2.5.3
    • 2.5.4
    • 2.5.5
    • 2.6.0
    • 2.6.1
    • 2.6.2
    • 2.6.3
    • 2.6.4
    • 2.7.0
    • 2.7.1
    • 2.7.2
    • 2.8.0
    • 2.8.1
    • 2.8.2
    • 2.8.3
    • 2.9.0
    • 2.9.1
    Affected ranges
    • ECOSYSTEM: < 2.20.0

    Update to 2.20.0

Original sources

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