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TI-2020-04437 Aliases CVE-2020-5390GHSA-qf7v-8hj3-4xw7

PySAML2 before 5.0.0 does not check that the signature in a SAML document is enveloped…

Priority LOW 35CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
Partial Red Hat: 5 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-347.

Summary

PySAML2 before 5.0.0 does not check that the signature in a SAML document is enveloped and thus signature wrapping is effective, i.e., it is affected by XML Signature Wrapping (XSW). The signature information and the node/object that is signed can be in different places and thus the signature verification will succeed, but the wrong data will be used. This specifically affects the verification of assertion that have been signed.

Why it matters now

EPSS 0.01234 69th percentileScored 2026-11-07
Fix Partial pysaml2 (PyPI): 5.0.0Red Hat: 5 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
—pysaml2 (PyPI)before 5.0.05.0.0Patch availableGHSA-qf7v-8hj3-4xw7
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • pysaml2 (PyPI) Vendor— Affected before 5.0.0 Fixed in 5.0.0 Patch available GHSA-qf7v-8hj3-4xw7

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:a:pysaml2_project:pysaml2:*:*:*:*:*:*:*:*before 5.0.0VulnerablePysaml2 Project
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*19.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*19.10VulnerableCanonical
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
  • cpe:2.3:a:pysaml2_project:pysaml2:*:*:*:*:*:*:*:* Versions before 5.0.0 Vulnerable ·Pysaml2 Project
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:* Versions 19.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* Versions 19.10 Vulnerable ·Canonical
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian

Remediation

  • Fix · GHSA-qf7v-8hj3-4xw7 pysaml2 (PyPI) Fixed in 5.0.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux OpenStack Platform 7 (Kilo)AffectedNo fix planned: Out of support scope
Red Hat OpenStack Platform 10 (Newton)AffectedNo fix planned: Out of support scope
Red Hat OpenStack Platform 13 (Queens)AffectedNo fix planned: Will not fix
Red Hat OpenStack Platform 15 (Stein)AffectedNo fix planned: Will not fix
Red Hat OpenStack Platform 16 (Train)AffectedNo fix planned: Will not fix

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-5390
  2. 2026-10-03 Alias added: GHSA-qf7v-8hj3-4xw7

References

Patch 2

Advisory 8

Other 5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences