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MEDIUM CISA KEV

CVE-2026-48710

CVSS v3

6.5

MEDIUM

EPSS Score

7.1 %

exploit probability, as of 2026-10-19

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • starlettePyPIall versions · fixed in 1.0.1

Vendor advisories

  • CVE-2026-48710 Red Hat Product Security119 products fixed · 26 known affected

    starlette: Starlette: Security restriction bypass via malformed HTTP Host header

    openshift-lightspeed/lightspeed-service-api-rhel9 as a component of OpenShift Lightspeed · rhaii/vllm-gaudi-rhel9 as a component of Red Hat AI Inference Server · rhaii/vllm-neuron-rhel9 as a component of Red Hat AI Inference Server

  • RHSA-2026:84734 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI

  • RHSA-2026:76150 Red Hat Product Security5 products fixed

    Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.4.5 security update

  • RHSA-2026:76149 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Enterprise Linux AI 3.4.5 security update

  • RHSA-2026:73987 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.3.7 - Red Hat OpenShift AI

  • RHSA-2026:70979 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat AI Inference 3.4.5 (cuda)

21 more advisories

Full record on NVD

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.

CISA Known Exploited Vulnerability

Date Added
2026-09-02
Patch Due Date
2026-09-16
Ransomware Use
Unknown

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Published
2026-05-26
Last Modified
2026-08-10

Frequently asked questions

What is CVE-2026-48710?

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.

Is CVE-2026-48710 actively exploited?

Yes. CVE-2026-48710 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-09-16.

What is the CVSS score for CVE-2026-48710?

CVE-2026-48710 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

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