There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - PySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 before 6.5.0 has an improper
    verification of cryptographic signature vulnerability. All users of pysaml2 that need to validate signed
    SAML documents are impacted. The vulnerability is a variant of XML Signature wrapping because it did not
    validate the SAML document against an XML schema. This allowed invalid XML documents to be processed and
    such a document can trick pysaml2 with a wrapped signature. This is fixed in PySAML2 6.5.0.
    (CVE-2021-21238)

  - PySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 before 6.5.0 has an improper
    verification of cryptographic signature vulnerability. Users of pysaml2 that use the default
    CryptoBackendXmlSec1 backend and need to verify signed SAML documents are impacted. PySAML2 does not
    ensure that a signed SAML document is correctly signed. The default CryptoBackendXmlSec1 backend is using
    the xmlsec1 binary to verify the signature of signed SAML documents, but by default xmlsec1 accepts any
    type of key found within the given document. xmlsec1 needs to be configured explicitly to only use only
    _x509 certificates_ for the verification process of the SAML document signature. This is fixed in PySAML2
    6.5.0. (CVE-2021-21239)

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

  - PySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 before 6.5.0 has an improper
    verification of cryptographic signature vulnerability. All users of pysaml2 that need to validate signed
    SAML documents are impacted. The vulnerability is a variant of XML Signature wrapping because it did not
    validate the SAML document against an XML schema. This allowed invalid XML documents to be processed and
    such a document can trick pysaml2 with a wrapped signature. This is fixed in PySAML2 6.5.0.
    (CVE-2021-21238)

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

  - PySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 before 6.5.0 has an improper     verification of cryptographic signature vulnerability. All users of pysaml2 that need to validate signed     SAML documents are impacted. The vulnerability is a variant of XML Signature wrapping because it did not     validate the SAML document against an XML schema. This allowed invalid XML documents to be processed and     such a document can trick pysaml2 with a wrapped signature. This is fixed in PySAML2 6.5.0.
    (CVE-2021-21238)

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

pysaml2 Releases :

Fix processing of invalid SAML XML documents - CVE-2021-21238

Fix unspecified xmlsec1 key-type preference - CVE-2021-21239

ID	Name	Product	Family	Published	Updated	Severity
406707	Alpine: multiple py3-saml2 packages: security update to 6.5.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	medium
400287	Alpine: multiple py3-saml2 packages: security update to 6.4.1-r0 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	8/16/2023	7/2/2026	medium
414254	SCA: security update for pysaml2 (GHSA-f4g9-h89h-jgv9)	Tenable Cloud Security	SCA Checks	1/23/2025	7/2/2026	medium
400287	Alpine: multiple py3-saml2 packages: security update to 6.4.1-r0 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	8/16/2023	7/2/2026	medium
414254	SCA: security update for pysaml2 (GHSA-f4g9-h89h-jgv9)	Tenable Self-Hosted Container Security	SCA Checks	1/23/2025	7/2/2026	medium
406707	Alpine: multiple py3-saml2 packages: security update to 6.5.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	medium
256726	Linux Distros Unpatched Vulnerability : CVE-2021-21238	Nessus	Misc.	8/27/2025	8/3/2026	medium
145469	FreeBSD : pysaml2 -- multiple vulnerabilities (fb67567a-5d95-11eb-a955-08002728f74c)	Nessus	FreeBSD Local Security Checks	1/27/2021	1/26/2024	medium

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