---
id: CVE-2024-34459
title: >-
  An issue was discovered in xmllint (from libxml2) before 2.11.8 and 2.12.x
  before 2.12.7
summary: >-
  An issue was discovered in xmllint (from libxml2) before 2.11.8 and 2.12.x
  before 2.12.7. Formatting error messages with xmllint --htmlout can result in
  a buffer over-read in xmlHTMLPrintFileContext in xmllint.c.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-122
vendor: xmlsoft
product: libxml2
affected:
  - libxml2 < 2.11.8
  - 'libxml2 >= 2.12.0, < 2.12.7'
patched:
  - libxml2 2.12.7
published: '2024-05-14'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:17:45.877'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-34459'
references:
  - url: 'https://gitlab.gnome.org/GNOME/libxml2/-/issues/720'
    label: cve@mitre.org
  - url: 'https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.11.8'
    label: cve@mitre.org
  - url: 'https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.12.7'
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5HVUXKYTBWT3G5DEEQX62STJQBY367NL/
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/INKSSLW5VMZIXHRPZBAW4TJUX5SQKARG/
    label: cve@mitre.org
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRDJCNQP32LV56KESUQ5SNZKAJWSZZRI/
    label: cve@mitre.org
  - url: 'https://gitlab.gnome.org/GNOME/libxml2/-/issues/720'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.11.8'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.12.7'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/07/msg00014.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5HVUXKYTBWT3G5DEEQX62STJQBY367NL/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/INKSSLW5VMZIXHRPZBAW4TJUX5SQKARG/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRDJCNQP32LV56KESUQ5SNZKAJWSZZRI/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5HVUXKYTBWT3G5DEEQX62STJQBY367NL/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/INKSSLW5VMZIXHRPZBAW4TJUX5SQKARG/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VRDJCNQP32LV56KESUQ5SNZKAJWSZZRI/
    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
  - cve.org
  - exploit-available
epss: 0.018
epssPercentile: 0.78066
ingestedAt: '2026-10-15T03:30:12.677Z'
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2024-08-22T17:18:58.922791Z'
---

## Overview

An issue was discovered in xmllint (from libxml2) before 2.11.8 and 2.12.x before 2.12.7. Formatting error messages with xmllint --htmlout can result in a buffer over-read in xmlHTMLPrintFileContext in xmllint.c.

## Affected

- `libxml2 < 2.11.8`
- `libxml2 >= 2.12.0, < 2.12.7`

## Remediation

Upgrade past the affected range:

- `libxml2 2.12.7`