CVE-2016-10127: PySAML2 allows remote attackers to conduct XML external entity (XXE) attacks via a crafted SAML XML request or

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CRITICAL 9.0WATCHLISTMITIGATE

CVE-2016-10127 is a critical-severity flaw (CVSS 9.0) affecting pysaml2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PySAML2 allows remote attackers to conduct XML external entity (XXE) attacks via a crafted SAML XML request or response.

Why this priority

Critical severity
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-611
Published	2017-03-03
Last modified	2026-06-17

Publisher (CNA): Debian GNU/Linux · Vendor: pysaml2 project

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

Am I affected?

Timeline

2017-03-03 15:59 UTCPublished CVE record published
2026-06-17 00:39 UTCUpdated Record last modified

pysaml2 project pysaml2 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pysaml2 || rpm -q pysaml2 || pysaml2 --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2016-10127?

pysaml2: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-10127 being exploited?

CVE-2016-10127 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-2016-10127 affect?

CVE-2016-10127 affects pysaml2. Severity is critical (CVSS 9.0). PySAML2 allows remote attackers to conduct XML external entity (XXE) attacks via a crafted SAML XML request or response.

How urgent is CVE-2016-10127?

Priority 58/100. Critical severity; On your watchlist

Related CVEs

CVE-2020-5390 HIGH 7.5 UPGRADE MITIGATE PySAML2 before 5.0.0 does not check that the signature in a SAML document is enveloped and thus signature wrap
CVE-2017-1000433 HIGH 8.1 UPGRADE MITIGATE pysaml2 version 4.4.0 and older accept any password when run with python optimizations enabled
CVE-2017-1000246 MEDIUM 5.3 UPGRADE Python package pysaml2 version 4.4.0 and earlier reuses the initialization vector across encryptions in the ID
CVE-2016-10149 HIGH 7.5 UPGRADE MITIGATE XML External Entity (XXE) vulnerability in PySAML2 4.4.0 and earlier allows remote attackers to read arbitrary

References

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