Medium 6.5Published Feb 9, 2026

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

Updated under an hour ago (Oct 27, 2026, 11:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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 (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-185
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Feb 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

litestar-org litestar litestar_org:litestar (from the name)	before 2.20.0	CNA record
litestar litestar litestar:litestar	before 2.20.0	NVD

References

References

https://github.com/litestar-org/litestar/security/advisories/GHSA-93ph-p7v4-hwh4	x-refsource-confirm, exploit, vendor-advisory
https://github.com/litestar-org/litestar/commit/06b36f481d1bfea6f19995cfb4f203aba45c4ace	x-refsource-misc, patch
https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0	x-refsource-misc, release-notes
https://github.com/litestar-org/litestar/releases/tag/v2.20.0	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.