Heap-based Buffer Overflow Affecting xlnt package, versions [0,]
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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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- published4 Mar 2026
- disclosed3 Mar 2026
- creditUnknown
Introduced: 3 Mar 2026
CVE-2026-3463 (opens in a new tab)How to fix?
There is no fixed version for xlnt.
Overview
Affected versions of this package are vulnerable to Heap-based Buffer Overflow via the xlnt::detail::binary_writer::append() function in the Compound Document Parser process. An attacker can cause a heap-based buffer overflow by providing specially crafted input to this function during local execution.