PyPI/pysaml2 CVE-2021-21239: medium 6.5, EPSS 1.29%

Improper Verification of Cryptographic Signature in PySAML2

Action: Upgrade pysaml2 to 6.5.0 or later.

pip install pysaml2==6.5.0

Affected

Fixed versions

Sources

• osv: GHSA-5p3x-r448-pc62
• https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-5p3x-r448-pc62
• https://nvd.nist.gov/vuln/detail/CVE-2021-21239
• https://github.com/IdentityPython/pysaml2/commit/46578df0695269a16f1c94171f1429873f90ed99
• https://github.com/IdentityPython/pysaml2
• https://github.com/IdentityPython/pysaml2/releases/tag/v6.5.0
• https://github.com/pypa/advisory-database/tree/main/vulns/pysaml2/PYSEC-2021-49.yaml
• https://lists.debian.org/debian-lts-announce/2021/02/msg00038.html
• https://pypi.org/project/pysaml2
• https://www.aleksey.com/pipermail/xmlsec/2013/009717.html

CVE-2021-21239 · published 2021-01-21T14:12:18Z · modified 2026-09-10T03:49:13.846262945Z · JSON