Out-of-bounds Read Affecting expat package, versions [,2.9.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CONAN-EXPAT-21707495
- published25 Oct 2026
- disclosed7 Oct 2026
- creditUnknown
Introduced: 7 Oct 2026
CVE-2026-77214 (opens in a new tab)How to fix?
Upgrade expat to version 2.9.0 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Read in the XML_ParseBuffer process. An attacker can disclose adjacent heap memory, including heap pointers and code pointers, by repeatedly invoking XML_ParseBuffer with crafted input that advances the buffer end beyond the allocated memory. This is only exploitable if a parse buffer is already present, which occurs after a prior call to XML_GetBuffer or an internal allocation via a previous XML_Parse call.