CVE-2026-56132: Buffer Overflow
Published Jun 19, 2026
·Updated
In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.
Affected Software
3 affected componentsFixes available
Expat libexpat<2.8.2
Libexpat Project Libexpat<2.8.2
Microsoft azl3 expat 2.6.4-6<2.8.2-1
2.8.2-1
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 2.8.2-1
Event History
Jun 19, 2026
CVE Published
via MITRE·03:00 AM
Data Sourced
via MITRE·03:00 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·06:17 AM
RemedyDescriptionSeverityWeaknessAffected Software
Jun 27, 2026
Data Sourced
via Microsoft·08:06 AM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·08:06 AM
DescriptionSeverity
Frequently Asked Questions
1
What is the severity of CVE-2026-56132?
The severity of CVE-2026-56132 is medium, with a CVSS score of 6.9.
2
What type of vulnerability is CVE-2026-56132?
CVE-2026-56132 is a heap-based buffer overflow vulnerability.
3
How do I fix CVE-2026-56132?
To fix CVE-2026-56132, update to libexpat version 2.8.2 or later.
4
What causes the vulnerability in CVE-2026-56132?
The vulnerability is caused by mishandled reallocation of the scaffold backing array when there is data-structure sharing across parsers.
5
Which software is affected by CVE-2026-56132?
CVE-2026-56132 affects libexpat versions prior to 2.8.2.