CVE-2026-25210: libexpat 2.7.4 fixes CVE-2026-24515 and CVE-2026-25210

Published Jan 30, 2026
·
Updated

In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.

Affected Software

10 affected componentsFixes available
libexpat<2.7.4
Libexpat Project Libexpat<2.7.4
IBM Engineering Requirements Management DOORS and DOORS Web Access<=9.7.2.1 - 9.7.2.11
IBM Engineering Requirements Management DOORS and DOORS Web Access<=9.6.1.1 - 9.6.1.13
alpine/expat<2.7.4-r0
2.7.4-r0
alpine/expat<2.7.4-r0
2.7.4-r0
alpine/expat<2.7.4-r0
2.7.4-r0
alpine/expat<2.7.4-r0
2.7.4-r0
alpine/expat<2.7.4-r0
2.7.4-r0
alpine/qt6-qtwebengine<6.11.1-r2
6.11.1-r2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade alpine/expat to a version that resolves this vulnerability.

    Fixed in 2.7.4-r0
  2. Upgrade

    Upgrade alpine/qt6-qtwebengine to a version that resolves this vulnerability.

    Fixed in 6.11.1-r2
  3. Upgrade

    Upgrade libexpat to a version that resolves this vulnerability.

    Fixed in 2.7.4Patch CVE-2026-24515
  4. Upgrade

    Upgrade libexpat to a version that resolves this vulnerability.

    Fixed in 2.7.4Patch CVE-2026-25210

Event History

Jan 30, 2026
CVE Published
via MITRE·06:40 AM
Data Sourced
via MITRE·06:40 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·07:16 AM
RemedyDescriptionSeverityWeaknessAffected Software
Jul 6, 2026
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software
Nov 3, 2026
Data Sourced
via OSV·06:32 AM
Affected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2026-25210?

CVE-2026-25210 is classified as a medium severity vulnerability.

2

How do I fix CVE-2026-25210?

To mitigate CVE-2026-25210, upgrade libexpat to version 2.7.4 or later.

3

What versions of libexpat are affected by CVE-2026-25210?

CVE-2026-25210 affects all versions of libexpat prior to 2.7.4.

4

What component of libexpat is impacted by CVE-2026-25210?

CVE-2026-25210 impacts the doContent function within libexpat due to improper buffer size checks.

5

Is CVE-2026-25210 an integer overflow vulnerability?

Yes, CVE-2026-25210 is due to an integer overflow issue in buffer reallocation.

Company

Resources

Contact

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