---
id: CVE-2017-9049
title: >-
  libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer
  over-read in the xmlDictComputeFastKey function in dict.c
summary: >-
  libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer
  over-read in the xmlDictComputeFastKey function in dict.c. This vulnerability
  causes programs that use libxml2, such as PHP, to crash. This vulnerability
  exists bec…
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-125
vendor: xmlsoft
product: libxml2
affected:
  - libxml2 = 2.9.4
published: '2017-05-18'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T07:16:41.193'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2017-9049'
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/98601'
    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/98601'
    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: '2026-10-14T07:21:04.796Z'
---

## Overview

libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer over-read in the xmlDictComputeFastKey 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 libxml2 Bug 759398.

## Affected

- `libxml2 = 2.9.4`

## Remediation

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