CVE-2026-56132
libexpat before 2.8.2 vulnerability
libexpat · 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.
MSRC advisory June 28, 2026
Alert details
- Source feed
- Microsoft MSRC
- CVE ID
- CVE-2026-56132
- Affected products
- 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. · In 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. · In
What happened
Information published.
What it means for your business
In 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. (CVE-2026-56132) was added to Microsoft’s security update guidance. Information published. PremierePC tracks MSRC advisories for Upstate SC businesses — patch or open a ticket if you need help verifying exposure.
Sources
Related briefs
Object corruption in V8 in Microsoft Edge vulnerability
Object corruption in V8 in Microsoft Edge vulnerability (CVE-2025-0612) was added to Microsoft’s security update guidance. Information published. If you need help checking exposure, call (864) 335-9223.
Windows DHCP Client Remote Code Execution vulnerability
Windows DHCP Client Remote Code Execution vulnerability (CVE-2026-54128) was added to Microsoft’s security update guidance. Updated an acknowledgement. This is an informational change only. If you need help checking exposure, call (864) 335-9223.
Windows GDI Elevation of Privilege vulnerability
Windows GDI Elevation of Privilege vulnerability (CVE-2026-50387) was added to Microsoft’s security update guidance. Updated an acknowledgement. This is an informational change only. If you need help checking exposure, call (864) 335-9223.
Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
Citrix NetScaler is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-88779). Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service. CISA remediation due date: 2026-10-07. If you need help checking exposure, call (864) 335-9223.
Need help patching?
PremierePC monitors KEV alerts for managed clients and helps teams prioritize remediation before attackers do.