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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.

🗓️ 27 Jun 2026 08:06:25Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 11 Views

Heap overflow in doProlog (xmlparse.c) before 2.8.2 due to mismanaged scaffold array

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Vulners
Node
microsoftazl3_expat_2.6.4-6Range<2.8.2-1

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03 Jul 2026 08:06Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.16.9
EPSS0.00107
SSVC
heap overflowdoPrologxmlparse.cscaffold arrayshared parsers
11