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Expat 2.9.0 released, fixes two vulnerabilities

Featured October 5, 2026Facts checked October 5, 2026Independently reviewed

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Expat 2.9.0 released, fixes two vulnerabilities presents itself as Expat 2.9.0 released, fixes two vulnerabilities. UpPeek surfaced it for people exploring hacker news.

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For readers new to Expat:
Expat 2.9.0 was released a few hours ago. The key motivation for cutting a release now was to get the security fixes and also new features into the hands of Expat's users.

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What stands out

The two security issues are:
CVE-2026-77214 — a potential out-of-bounds read with function XML_ParseBuffer due to insufficient validation of the length parameter,
CVE-2026-102633 — an integer overflow in memory management code that affects 32-bit platforms.

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