CVE-2026-25479

Summary

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 Software

Weaknesses

• CWE-185: CWE-185: Incorrect Regular Expression

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://github.com/litestar-org/litestar/security/advisories/GHSA-93ph-p7v4-hwh4
• https://github.com/litestar-org/litestar/commit/06b36f481d1bfea6f19995cfb4f203aba45c4ace
• https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0
• https://github.com/litestar-org/litestar/releases/tag/v2.20.0

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