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Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-48710

starlette

Kludex / starlette · affected before *

View live feed Monitor via API Watch CVE-2026-48710
Severity
CVSS 6.5 · Medium
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
36.3%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-48710 is an unauthenticated vulnerability affecting Kludex starlette. Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not validated before being...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

Kludex / starlette affected before *.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Starlette is a lightweight ASGI framework/toolkit

Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not validated before being used to reconstruct `request.url`. Because the routing algorithm relies on the raw HTTP path while `request.url` is rebuilt from the `Host` header, a malformed header could make `request.url.path` differ from the path that was actually requested.

Middleware and endpoints that apply security restrictions based on `request.url` (rather than the raw `scope` path) could therefore be bypassed. Users should upgrade to a version greater than or equal to version 1.0.1, which validates the `Host` header against the grammar of RFC 9112 §3.2 / RFC 3986 §3.2.2 when constructing `request.url` and falls back to `scope["server"]` for malformed values.

Vendor Product Affected Status
Red Hat Red Hat OpenShift AI (RHOAI) rhoai/odh-kserve-storage-initializer-rhel9 All versions (default: affected) Affected
Red Hat Red Hat OpenShift AI (RHOAI) rhoai/odh-llm-d-kv-cache-rhel9 All versions (default: affected) Affected
Red Hat Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9 All versions (default: affected) Affected
Red Hat Red Hat OpenShift AI (RHOAI) rhoai/odh-mlserver-rhel9 All versions (default: unaffected) Unaffected
Red Hat Red Hat OpenShift AI (RHOAI) rhoai/odh-th06-cpu-torch210-py312-rhel9 All versions (default: affected) Affected
Red Hat Red Hat OpenShift AI (RHOAI) rhoai/odh-th06-cuda130-torch210-py312-rhel9 All versions (default: affected) Affected
Red Hat Red Hat OpenShift AI (RHOAI) rhoai/odh-th06-rocm64-torch291-py312-rhel9 All versions (default: affected) Affected
Red Hat Red Hat OpenShift AI (RHOAI) rhoai/odh-vllm-cuda-rhel9 All versions (default: affected) Affected
Red Hat Red Hat OpenShift AI (RHOAI) rhoai/odh-vllm-gaudi-rhel9 All versions (default: affected) Affected
Red Hat Red Hat OpenShift AI (RHOAI) rhoai/odh-vllm-rocm-rhel9 All versions (default: affected) Affected
Kludex starlette Before 1.0.1 Affected
Published
26 May 2026
Exploitation Reported
02 Sep 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa nuclei_scanner

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 02 Sep 2026

Independent exploitation attestation added to the Previdian record.

Proof of concept available

GitHub

Recorded 28 May 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
CISA First 2026-09-02 17:31 UTC
CVE 2026-09-02 18:01 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0
Callback hosts
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-48710.yaml 05 Jun 2026

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS

36.3%

Weaknesses

Improper Validation of Unsafe Equivalence in Input CWE-1289 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') CWE-444

Recent mention · Github Advisory Database (PIP)

[starlette] Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks

Summary In affected versions, the HTTP Host request header was not validated before being used to reconstruct request.url. Because the routing algorithm relies on the raw HTTP path while request.url is rebuilt from the Host header, a malformed header could make...

Read full advisory

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

CuteeCat/CVE-2026-48710

github · Created 2026-08-11 08:21:36 UTC · 0 stars · AI assessment 85%

CVE-2026-48710漏洞验证代码

Starlette - Improper Validation of Unsafe Equivalence in Input

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. KEV confirmed by CVE

    Exploitation attested by an external source

  2. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  3. Public PoC available

    Public proof-of-concept code published

  4. Nuclei template available

    Scanner coverage available

  5. CVE published

    Vulnerability disclosed publicly

  6. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-48710

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-48710",
  "confidence": "Confirmed",
  "cvss_score": 6.5,
  "cvss_estimated": false,
  "epss_score": 0.36257,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}