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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-48710)

The version of IBM Cognos Analytics installed on the remote host is 12.1.x prior to 12.1.3 FP2. It is, therefore, affected by multiple vulnerabilities as referenced in the IBM Security Bulletin No. 7287209. These vulnerabilities are applicable only to version 12.1.3 due to newer functionalities and an updated software stack:

  - Arbitrary class instantiation via model manifest in Apache OpenNLP ExtensionLoader. The     ExtensionLoader.instantiateExtension() method loads a class by its fully-qualified name via     Class.forName() and invokes its no-arg constructor, with the class name sourced from the     manifest.properties entry of a model archive. An attacker who can supply a crafted model archive can     cause the static initializer of any class on the classpath to run during model loading.
    (CVE-2026-42027)

  - XML External Entity (XXE) via unsanitized dictionary parsing in Apache OpenNLP     DictionaryEntryPersistor. An attacker who can supply a crafted dictionary file containing a malicious     DOCTYPE declaration can trigger local file disclosure via file:// entity references or server-side     request forgery via http:// entity references during SAX parsing. (CVE-2026-40682)

  - An authenticated attacker may bypass the fix in CVE-2026-34197 by adding a connector using an HTTP     Discovery transport via BrokerView.addNetworkConnector or BrokerView.addConnector through Jolokia if the     activemq-http module is on the classpath, resulting in arbitrary code execution on the Apache ActiveMQ     broker's JVM. (CVE-2026-40466)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-e0f378428e advisory.

    Backport fix for CVE-2026-48710

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-3bce8d3f11 advisory.

    Backport fix for CVE-2026-48710

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 12 / 13 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-6302 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6302-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     May 27, 2026                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : starlette     CVE ID         : CVE-2026-48710

    It was discovered that missing validation of Host: headers in the     Starlette ASGI framework could result in a bypass of security checks.

    For the oldstable distribution (bookworm), this problem has been fixed     in version 0.26.1-1+deb12u1. This update also resolves three additional     security issues (CVE-2023-29159, CVE-2024-47874 and CVE-2025-54121).

    For the stable distribution (trixie), this problem has been fixed in     version 0.46.1-3+deb13u2.

    We recommend that you upgrade your starlette packages.

    For the detailed security status of starlette please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/starlette

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-48710)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
458157	Echo: starlette: security update to 1.0.1	Tenable Cloud Security	Echo Local Security Checks	Local	medium
458157	Echo: starlette: security update to 1.0.1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
347959	IBM Cognos Analytics 12.1.x < 12.1.3 FP2 Multiple Vulnerabilities (7287209)	Nessus	CGI abuses	Remote	high
318780	Fedora 43 : python-starlette (2026-e0f378428e)	Nessus	Fedora Local Security Checks	Local	medium
318768	Fedora 44 : python-starlette (2026-3bce8d3f11)	Nessus	Fedora Local Security Checks	Local	medium
442645	SCA: security update for starlette (GHSA-86qp-5c8j-p5mr)	Tenable Cloud Security	SCA Checks	Local	medium
442645	SCA: security update for starlette (GHSA-86qp-5c8j-p5mr)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
317342	Debian dsa-6302 : python3-starlette - security update	Nessus	Debian Local Security Checks	Local	high
316593	Linux Distros Unpatched Vulnerability : CVE-2026-48710	Nessus	Misc.	Local	medium

Detections

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CVE-2026-48710

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Tenable Plugins

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