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Vulnerability Intelligence

CVE-2026-48710

MediumExploitedPublic exploit

Missing Host header validation poisons request.url.path, bypassing path-based security checks

Published May 22, 2026 · Updated Oct 13, 2026 · Also known as DEBIAN-CVE-2026-48710, EUVD-2026-32016, GHSA-86qp-5c8j-p5mr, PYSEC-2026-161, ROOT-APP-PYPI-CVE-2026-48710, UBUNTU-CVE-2026-48710, X41-2026-002

Key Facts

Patch immediately
  • CVE-2026-48710 is a medium-severity vulnerability (CVSS 6.5 v3.1) affecting Starlette (Encode), Ai Inference Server (Redhat), Ansible Automation Platform (Redhat) and 22 more products.
  • It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 26, 2026 and is known to be used in ransomware campaigns. Public exploit code is available.
  • EPSS estimates a 7.1% probability of exploitation in the next 30 days.
  • Fixed versions are available, including airflow-3 3.2.2-r0, Ansible Automation Platform 27/lightspeed-chatbot-rhel9:1780099185, Starlette 1.0.1.
  • Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

6.5

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

EPSS (30-day exploit likelihood)

7.1%

Higher than 94.1% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings, used by ransomware

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2026-48710 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

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.

Known-Exploited Catalog Listings

CatalogAddedRemediation dueRansomware use
CISA KEVSep 2, 2026Sep 16, 2026Not reported
Industry KEV feedMay 26, 2026Sep 16, 2026Known
CIRCL KEVSep 2, 2026Sep 16, 2026Not reported
ENISA EUVDSep 2, 2026n/aNot reported

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Affected Products

104 affected entries in total
ProductAffected versionsFixed in
StarletteEncode>= < 1.0.11.0.1
Ai Inference ServerRedhatSee advisory3.3.5
Ansible Automation PlatformRedhat2.6, 2.727/lightspeed-chatbot-rhel9:1780099185
Migration Toolkit For ApplicationsRedhatSee advisory8.2.0
Openshift AiRedhatSee advisory3.3.5
20 more affected products in the full CVE brief

Patched Releases

airflow-3

3.2.2-r0

Ansible Automation Platform

27/lightspeed-chatbot-rhel9:1780099185

Starlette

1.0.1, 0.17.1+sp999, 0.19.0+aikido.1, 0.19.1+aikido.1, 0.21.0+aikido.1, 0.22.0+aikido.3, 0.22.0+aikido.5, 0.22.0+aikido.6, 0.22.0+aikido.7, 0.26.1-1+deb12u1, 0.27.0+aikido.1, 0.27.0+aikido.10, 0.27.0+aikido.11, 0.36.1+aikido.1, 0.36.2+aikido.1, 0.37.2+aikido.2, 0.38.2+aikido.1, 0.38.4+aikido.1, 0.38.5+aikido.1, 0.38.6+aikido.1, 0.39.2+aikido.2, 0.41.0+aikido.1, 0.41.2+aikido.2, 0.41.3+aikido.2, 0.41.3+aikido.3, 0.41.3+aikido.5, 0.41.3+aikido.6, 0.41.3+aikido.7, 0.43.0+aikido.1, 0.44.0+aikido.1, 0.45.0+aikido.1, 0.45.1+aikido.1, 0.45.2+aikido.2, 0.45.3+aikido.10, 0.45.3+aikido.11, 0.45.3+aikido.13, 0.45.3+aikido.14, 0.45.3+aikido.15, 0.45.3+aikido.5, 0.45.3+aikido.6, 0.45.3+aikido.7, 0.45.3+aikido.8, 0.45.3+aikido.9, 0.46.0+aikido.2, 0.46.1-3+deb13u2, 0.46.2+aikido.6, 0.46.2+aikido.7, 0.47.0+aikido.3, 0.47.1+aikido.2, 0.47.1+aikido.3, 0.47.2+aikido.2, 0.47.2+aikido.3, 0.47.3+aikido.5, 0.48.0+aikido.5, 0.49.0+aikido.1, 0.49.1+aikido.2, 0.49.1+aikido.3, 0.49.2+aikido.1, 0.49.2+aikido.3, 0.49.2+aikido.4, 0.49.3+aikido.1, 0.49.3+aikido.3, 0.49.3+aikido.4, 0.50.0+aikido.3, 0.51.0+aikido.1, 0.52.0+aikido.1, 0.52.1+aikido.2, 0.52.1+aikido.3, 0.9.9+aikido.1, 0.9.9+aikido.2, 1.0.0+aikido.3, 1.1.0-1

k8s-sidecar

2.3.0-r0

mcp-server-fetch

2026.6.16-r0

mcp-time

2026.6.16-r0

mlflow

3.16.0-r0

nemo

2.7.3-r6

py3-starlette

1.1.0-r0

python311-google-adk

2.2.0-1.1

python311-starlette

1.2.0-1.1

python313-google-adk

2.2.0-1.1

python313-starlette

0.41.3-160000.3.1, 1.2.0-1.1

python314-google-adk

2.2.0-1.1

python314-starlette

1.2.0-1.1

Ai Inference Server

3.3.5

Migration Toolkit For Applications

8.2.0

Openshift Ai

3.3.5, 3.4.2

rootio-starlette

0.19.0+aikido.2, 0.19.0+root.io.1, 0.19.1+aikido.2, 0.19.1+root.io.1, 0.21.0+aikido.2, 0.21.0+root.io.1, 0.22.0+aikido.4, 0.22.0+root.io.2, 0.22.0+root.io.3, 0.22.0+root.io.5, 0.27.0+root.io.1, 0.36.1+root.io.1, 0.36.2+root.io.1, 0.38.2+root.io.1, 0.38.4+root.io.1, 0.38.5+root.io.1, 0.38.6+root.io.1, 0.41.0+root.io.1, 0.41.2+root.io.2, 0.41.3+aikido.4, 0.41.3+root.io.2, 0.41.3+root.io.3, 0.41.3+root.io.5, 0.41.3+root.io.6, 0.41.3+root.io.7, 0.43.0+aikido.2, 0.43.0+root.io.1, 0.44.0+aikido.2, 0.44.0+root.io.1, 0.45.0+aikido.2, 0.45.0+root.io.1, 0.45.1+aikido.2, 0.45.1+root.io.1, 0.45.2+aikido.3, 0.45.2+root.io.2, 0.45.3+aikido.12, 0.45.3+root.io.13, 0.45.3+root.io.14, 0.45.3+root.io.15, 0.45.3+root.io.3, 0.46.0+aikido.3, 0.46.0+root.io.2, 0.46.2+root.io.6, 0.46.2+root.io.7, 0.47.0+aikido.4, 0.47.0+root.io.3, 0.47.1+aikido.4, 0.47.1+root.io.2, 0.47.1+root.io.3, 0.47.2+aikido.4, 0.47.2+root.io.2, 0.47.2+root.io.3, 0.47.3+root.io.5, 0.48.0+root.io.5, 0.49.0+aikido.2, 0.49.0+root.io.1, 0.49.0+root.io.3, 0.49.1+aikido.1, 0.49.1+root.io.2, 0.49.1+root.io.3, 0.49.2+aikido.2, 0.49.2+root.io.1, 0.49.2+root.io.3, 0.49.2+root.io.4, 0.49.3+aikido.2, 0.49.3+root.io.1, 0.49.3+root.io.3, 0.49.3+root.io.4, 0.51.0+aikido.2, 0.51.0+root.io.1, 0.52.0+aikido.2, 0.52.0+root.io.1, 0.52.1+aikido.1, 0.52.1+root.io.2, 0.52.1+root.io.3, 0.9.9+aikido.3, 0.9.9+root.io.1, 0.9.9+root.io.2, 1.0.0+root.io.3

seal-starlette

0.17.1+sp999

tritonserver-backend-vllm-cuda-12.9

25.9.0_git20260617-r0

vllm-cu129

0.22.0-r0

vllm-cu130

0.22.0-r0

wazuh-manager

4.14.5-r2

wazuh-manager-fips

4.14.5-r3

Timeline

  1. Publicly disclosed

    May 22, 2026

  2. Added to Industry KEV feed

    May 26, 2026

  3. Added to CISA KEV

    Sep 2, 2026

  4. Added to CIRCL KEV

    Sep 2, 2026

  5. Added to ENISA EUVD

    Sep 2, 2026

  6. Last updated

    Oct 13, 2026

Weakness Type

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

References

15 more references in the full CVE brief

FAQ

Common Questions.

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