CVE-2017-11427: OneLogin PythonSAML 2.3.0 and earlier may incorrectly utilize the results of XML DOM traversal and canonicaliz

Q: How do I fix CVE-2017-11427?

pythonsaml: upgrade to newer than 2.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2017-11427 being exploited?

CVE-2017-11427 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-11427 affect?

CVE-2017-11427 affects pythonsaml. Severity is high (CVSS 7.7). 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

Q: How urgent is CVE-2017-11427?

Priority 55/100. High severity; EPSS top 9%: very likely to be exploited; Public exploit reference

This month

HIGH 7.7UPGRADE

CVE-2017-11427 is a high-severity flaw (CVSS 7.7) affecting pythonsaml. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
EPSS top 9%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	4.4% (top 9%)
CISA exploited list	No
Weakness	CWE-287
Published	2019-04-17
Last modified	2026-06-17

Publisher (CNA): Duo Security, Inc. · Vendor: onelogin

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-04-17 14:29 UTCPublished CVE record published
2026-06-17 01:01 UTCUpdated Record last modified

onelogin pythonsaml UPGRADE

Affected: <= 2.3.0

Fixed in: newer than 2.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pythonsaml || rpm -q pythonsaml || pythonsaml --version

2. UPGRADE to newer than 2.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pythonsaml

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pythonsaml

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-11427?

pythonsaml: upgrade to newer than 2.3.0. Exact commands for each OS are on this page.

Is CVE-2017-11427 being exploited?

CVE-2017-11427 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-11427 affect?

CVE-2017-11427 affects pythonsaml. Severity is high (CVSS 7.7). 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

How urgent is CVE-2017-11427?

Priority 55/100. High severity; EPSS top 9%: very likely to be exploited; Public exploit reference

References

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