CVE-2016-10149

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.

Published: 2017-03-24 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-10149 is rated Moderate Risk (56.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.97%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-10149

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-09 1.31% 0.97% -0.34%
2 2025-12-14 1.77% 1.31% -0.46%
3 2025-04-13 — 1.77% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-10149

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2016-10149

GitHub Security Advisory for CVE-2016-10149

GHSA-c2vx-49jm-h3f6 · Severity: high · Ecosystem: pip — Pysaml2 does not sanitize XML responses

OS Trackers for CVE-2016-10149

vendor priority summary link
debian not yet assigned CVE-2016-10149 not yet assigned priority: Debian including 1 source packages (python-pysaml2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-10149
redhat medium — https://access.redhat.com/security/cve/CVE-2016-10149
suse high CVE-2016-10149 severity important: SUSE including 2 source package names (python-defusedxml-0.4.1-2.1, python-pysaml2-2.4.0-3.1), 2 product×package rows across 1 product lines (SUSE OpenStack Cloud 6): Fixed 2. https://www.suse.com/security/cve/CVE-2016-10149/
ubuntu medium CVE-2016-10149 medium priority: Ubuntu including 1 source packages (python-pysaml2), 6 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): released 3, DNE 2, ignored 1. https://ubuntu.com/security/CVE-2016-10149

Affected software / configurations for CVE-2016-10149

Vendor Product Version Raw CPE
pysaml2_project pysaml2 <= 4.4.0 cpe:2.3:a:pysaml2_project:pysaml2:*:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

References for CVE-2016-10149

cvelogic Threat Intelligence