CVE-2016-4449

What it is

XML external entity (XXE) vulnerability in the xmlStringLenDecodeEntities function in parser.c in libxml2 before 2.9.4, when not in validating mode, allows context-dependent attackers to read arbitrary files or cause a denial of service (resource consumption) via unspecified vectors.

At a glance

Exploitability

Can be exploited locally on the machine without logging in, but needs a user to act. High risk of data exposure, service disruption.

Exploit odds

1.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2016-06-09 16:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:47 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.7% in the next 30 days (EPSS).
• Severity: 7.1 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2016-06-09 16:59 UTC

Last modified

2026-06-17 00:47 UTC

Exploit probability

1.7% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Debian Linux 8.0
• Canonical Ubuntu Linux 12.04
• Canonical Ubuntu Linux 14.04
• Canonical Ubuntu Linux 15.10
• Canonical Ubuntu Linux 16.04
• Xmlsoft libxml2 ≤ 2.9.3

Attack profile CVSS 3.0 · 7.1

Attack vector

Local

Complexity

Low

Privileges needed

None

User interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2016-4449.md and follow it. Check whether this project is affected by CVE-2016-4449. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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