Is CVE-2026-16517 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-16517?

CVE-2026-16517 has a CVSS v3 severity of LOW (2.9).

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CVE-2026-16517

Description

A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archive_write_zip_header function in archive_write_set_format_zip.c, when ZIP encryption is enabled and the entry file size is close to INT64_MAX, the addition of the encryption overhead to the entry size overflows int64_t, resulting in undefined behavior. This could lead to incorrect Zip64 extension decisions or potential memory corruption.