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HIGH

CVE-2024-34459

libxml2: buffer over-read in xmlHTMLPrintFileContext in xmllint.c

CVSS v3

7.5

HIGH

EPSS Score

1.8 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

poc

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libxml2AlmaLinux:10all versions · fixed in 2.12.5-10.el10_2.1and 3 other packages
  • libxml2AlmaLinux:9all versions · fixed in 2.9.13-14.el9_8.1and 2 other packages
  • libxml2AlmaLinux:8all versions · fixed in 2.9.7-21.el8_10.5and 2 other packages

Vendor advisories

  • CVE-2024-34459 Red Hat Product Security497 products fixed · 10 known affected

    libxml2: buffer over-read in xmlHTMLPrintFileContext in xmllint.c

    libxml2 as a component of Red Hat Enterprise Linux 6 · libxml2-devel as a component of Red Hat Enterprise Linux 6 · libxml2-python as a component of Red Hat Enterprise Linux 6

  • RHSA-2026:82888 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.17.2

  • RHSA-2026:82857 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.2

  • RHSA-2026:82372 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.2

  • RHSA-2026:82354 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.2

  • RHSA-2026:82347 Red Hat Product Security8 products fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.2

20 more advisories

Full record on NVD

Description

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2024-05-14
Last Modified
2025-11-04

Frequently asked questions

What is CVE-2024-34459?

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.

Is CVE-2024-34459 actively exploited?

A proof-of-concept exploit exists for CVE-2024-34459, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2024-34459?

CVE-2024-34459 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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