Python-saml allows manipulation of SAML data without invalidation of cryptographic signature
OneLogin PythonSAML 2.3.0 and earlier may incorrectly utilize the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature, allowing the attack to potentially bypass authentication to SAML service providers.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | python-saml | < 2.4.0 | 2.4.0 |
References
- https://www.kb.cert.org/vuls/id/475445
- https://duo.com/blog/duo-finds-saml-vulnerabilities-affecting-multiple-implementations
- https://github.com/advisories/GHSA-j8j8-348v-wfm3
- https://nvd.nist.gov/vuln/detail/CVE-2017-11427
- https://github.com/SAML-Toolkits/python-saml/commit/fad881b4432febea69d70691dfed51c93f0de10f
- https://github.com/SAML-Toolkits/python-saml
- https://github.com/pypa/advisory-database/tree/main/vulns/python-saml/PYSEC-2019-198.yaml
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N- Weakness (CWE)
CWE-287- Platform
- Python (PyPI)
- Package
python-saml- Disclosed
- 17.04.2019
- Updated
- 11.10.2026 11:20
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2019-198 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-j8j8-348v-wfm3 - CC BY 4.0
Vulnerability history: python-saml
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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