CVE-2016-10149: XML External Entity (XXE) vulnerability in PySAML2 4.4.0 and earlier allows remote attackers to read arbitrary

Q: How do I fix CVE-2016-10149?

pysaml2: upgrade to newer than 4.4.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2016-10149 being exploited?

CVE-2016-10149 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-2016-10149 affect?

CVE-2016-10149 affects pysaml2, debian linux. Severity is high (CVSS 7.5). XML External Entity (XXE) vulnerability in PySAML2 4.4.0 and earlier allows remote attackers to read arbitrary files via a crafted SAML XML request or response.

Q: How urgent is CVE-2016-10149?

Priority 59/100. High severity; EPSS top 8%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2016-10149 is a high-severity flaw (CVSS 7.5) affecting pysaml2, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

XML External Entity (XXE) vulnerability in PySAML2 4.4.0 and earlier allows remote attackers to read arbitrary files via a crafted SAML XML request or response.

Why this priority

High severity
EPSS top 8%: very likely to be exploited
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	5.0% (top 8%)
CISA exploited list	No
Weakness	CWE-611
Published	2017-03-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · pysaml2 project

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

Am I affected?

Timeline

2017-03-24 14:59 UTCPublished CVE record published
2026-06-17 00:39 UTCUpdated Record last modified

pysaml2 project pysaml2 UPGRADE

Affected: <= 4.4.0

Fixed in: newer than 4.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 4.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pysaml2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pysaml2

Note

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

debian debian linux MITIGATE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2016-10149?

pysaml2: upgrade to newer than 4.4.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-10149 being exploited?

CVE-2016-10149 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-2016-10149 affect?

CVE-2016-10149 affects pysaml2, debian linux. Severity is high (CVSS 7.5). XML External Entity (XXE) vulnerability in PySAML2 4.4.0 and earlier allows remote attackers to read arbitrary files via a crafted SAML XML request or response.

How urgent is CVE-2016-10149?

Priority 59/100. High severity; EPSS top 8%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities

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-2016-10127 CRITICAL 9.0 MITIGATE PySAML2 allows remote attackers to conduct XML external entity (XXE) attacks via a crafted SAML XML request or

References

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