id: PYSEC-2026-2196
published: "2026-02-09T20:15:57.177Z"
modified: "2026-07-13T05:49:37.052375Z"
aliases:
- CVE-2026-25479
- GHSA-93ph-p7v4-hwh4
details: 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.
affected:
- package:
    name: litestar
    ecosystem: PyPI
    purl: pkg:pypi/litestar
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 2.20.0
  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
  ecosystem_specific: {}
references:
- type: ADVISORY
  url: "https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0"
- type: ADVISORY
  url: https://github.com/litestar-org/litestar/releases/tag/v2.20.0
- type: FIX
  url: https://github.com/litestar-org/litestar/commit/06b36f481d1bfea6f19995cfb4f203aba45c4ace
- type: EVIDENCE
  url: https://github.com/litestar-org/litestar/security/advisories/GHSA-93ph-p7v4-hwh4
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N