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CVE-2026-25478

CVE-2026-25478 · Litestar has a CORS origin allowlist bypass due to unescaped regex metacharacters in allowed origins

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, CORSConfig.allowed_origins_regex is constructed using a regex built from configured allowlist values and used with fullmatch() for validation. Because metacharacters are not escaped, a malicious origin can match unexpectedly. The check relies on allowed_origins_regex.fullmatch(origin). This vulnerability is fixed in 2.20.0.

CVSS 7.4 · High · 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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