{"action":"Upgrade pysaml2 to 6.5.0 or later.","affected":[{"fixed":"6.5.0","introduced":"0"}],"component":"pysaml2","cve_ids":["CVE-2021-21239"],"ecosystem":"PyPI","epss":0.01291,"exploited":false,"fixed_versions":["6.5.0"],"ghsa_id":"GHSA-5p3x-r448-pc62","id":"tcs_01M5KF1DNNF97X6JC878AETVSY","modified_at":"2026-09-10T03:49:13.846262945Z","published_at":"2021-01-21T14:12:18Z","references":["https://osv.dev/vulnerability/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"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"GHSA-5p3x-r448-pc62","url":"https://osv.dev/vulnerability/GHSA-5p3x-r448-pc62"}],"summary":"Improper Verification of Cryptographic Signature in PySAML2"}