---
id: CVE-2017-9050
title: >-
  libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer
  over-read in the xmlDictAddString function in dict.c
summary: >-
  libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer
  over-read in the xmlDictAddString function in dict.c. This vulnerability
  causes programs that use libxml2, such as PHP, to crash. This vulnerability
  exists because …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
  - CWE-122
vendor: xmlsoft
product: libxml2
affected:
  - libxml2 = 2.9.4
published: '2017-05-18'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T07:16:41.420'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2017-9050'
references:
  - url: 'http://www.debian.org/security/2017/dsa-3952'
    label: cve@mitre.org
  - url: 'http://www.openwall.com/lists/oss-security/2017/05/15/1'
    label: cve@mitre.org
  - url: 'http://www.securityfocus.com/bid/98568'
    label: cve@mitre.org
  - url: >-
      https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
    label: cve@mitre.org
  - url: >-
      https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
    label: cve@mitre.org
  - url: 'https://security.gentoo.org/glsa/201711-01'
    label: cve@mitre.org
  - url: 'http://www.debian.org/security/2017/dsa-3952'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.openwall.com/lists/oss-security/2017/05/15/1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.securityfocus.com/bid/98568'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/201711-01'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.04626
epssPercentile: 0.91507
ingestedAt: '2026-10-14T07:21:04.797Z'
---

## Overview

libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer over-read in the xmlDictAddString function in dict.c. This vulnerability causes programs that use libxml2, such as PHP, to crash. This vulnerability exists because of an incomplete fix for CVE-2016-1839.

## Affected

- `libxml2 = 2.9.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.