https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-10-04T16:16:39.941625+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/cve-2021-21239 CVE-2021-21239 — Open default xmlsec1 key-type preference 2026-10-04T16:16:39.945031+00:00

Affected: IdentityPython pysaml2

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.

 https://vulnerability.circl.lu/vuln/usn-5066-1 USN-5066-1 — python-pysaml2 vulnerability 2026-10-04T16:16:39.945136+00:00

Affected: Ubuntu:18.04:LTS: python-pysaml2, Ubuntu:20.04:LTS: python-pysaml2

Brian Wolff discovered that PySAML2 incorrectly validated cryptographic signatures. A remote attacker could possibly use this issue to alter SAML documents.