CVE-2026-48061Public exploitNetwork attack vectorHinoki check available

Unauthenticated host validation bypass via forwarded-host fallback

Published Aug 3, 2026 · Updated Aug 3, 2026

Host validation bypass in Litestar before 2.22.0 allows remote attackers to submit requests under an allowed host without authentication. AllowedHostsMiddleware.call falls back from a missing Host header to the client-controlled X-Forwarded-Host value and validates it against the allowlist. Exposure requires AllowedHostsConfig plus HTTP/1.0 acceptance or a deployment that does not strip X-Forwarded-Host, enabling reset-link, cache, or routing manipulation.

CVSS severity5.9
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Host validation bypass in Litestar before 2.22.0 allows remote attackers to submit requests under an allowed host without authentication. AllowedHostsMiddleware.call falls back from a missing Host header to the client-controlled X-Forwarded-Host value and validates it against the allowlist. Exposure requires AllowedHostsConfig plus HTTP/1.0 acceptance or a deployment that does not strip X-Forwarded-Host, enabling reset-link, cache, or routing manipulation.

The record

CVE
CVE-2026-48061
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
Litestar
Product
Litestar
Classifications
CWE-644, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.22.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Litestar · Litestarversion=< 2.22.0

Published CVSS scores

5.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-644Improper Neutralization of HTTP Headers for Scripting Syntax
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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