Read the docs
TI-2026-35502 Aliases CVE-2026-48061GHSA-3qmc-cj7q-62hv

Litestar: AllowedHostsMiddleware bypasses host validation via client-controlled X-Forwarded-Host header

Priority MEDIUM 60CWE-644Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. In versions prior to 2.22.0, an attacker can bypass the allowed hosts validation by omitting the Host header and supplying an X-Forwarded-Host header set to a whitelisted domain. The AllowedHostsMiddleware trusts the X-Forwarded-Host header as a fallback when the Host header is absent. Since X-Forwarded-Host is a client-controllable header, this enables host header injection attacks such as password reset poisoning, cache poisoning, and server-side request routing manipulation. Any application using AllowedHostsConfig is affected when deployed without a reverse proxy that strips X-Forwarded-Host, or when accepting HTTP/1.0 connections. This issue has been fixed in version 2.22.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00375 31st percentileScored 2026-11-07
Fix Fixed litestar (litestar-org): 2.22.0litestar (PyPI): 2.22.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
litestar-orglitestarbefore 2.22.02.22.0Patch availableCNA
—litestar (PyPI)before 2.22.02.22.0Patch availableGHSA-3qmc-cj7q-62hv
  • litestar Vendorlitestar-org Affected before 2.22.0 Fixed in 2.22.0 Patch available CNA
  • litestar (PyPI) Vendor— Affected before 2.22.0 Fixed in 2.22.0 Patch available GHSA-3qmc-cj7q-62hv

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:litestar:litestar:*:*:*:*:*:*:*:*——litestar-org
  • cpe:2.3:a:litestar:litestar:*:*:*:*:*:*:*:* Versions — — ·litestar-org

Remediation

  • Fix · CNA litestar (litestar-org) Fixed in 2.22.0
  • Fix · GHSA-3qmc-cj7q-62hv litestar (PyPI) Fixed in 2.22.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-48061
  2. 2026-10-03 Alias added: GHSA-3qmc-cj7q-62hv

References

Other 3

  • TI-2024-21848 Litestar and Starlite affected by Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') CVSS 3.1HIGH 8.2
  • TI-2024-35241 Litestar allows unbounded resource consumption (DoS vulnerability) CVSS 4.0HIGH 8.2
  • TI-2025-36757 X-Forwarded-For Header Spoofing Bypasses Litestar Rate Limiting CVSS 3.1HIGH 7.5
  • TI-2026-35501 Litestar: HTML Injection Through CSRF Token CVSS 3.1HIGH 8.1
  • TI-2024-28356 Litestar repository vulnerable to Environment Variable injection in `docs-preview.yml` workflow CVSS 3.1HIGH 8.3
  • TI-2026-20591 FileStore key canonicalization collisions allow response cache mixup/poisoning (ASCII ord + Unicode NFKD) CVSS 3.1MEDIUM 6.5
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences