CVE-2026-16517

Libarchive: libarchive: signed integer overflow in archive_write_zip_header

CVSS 3.1 2.9 LOWCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-16517

Published

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.

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Affected versions, risk and source history

Exploitation and risk

Source status

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Advisory history

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6 Nov 2026 20:10:08 UTC