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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

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cve-program · CVE-2026-16517

Published

Libarchive: libarchive: signed integer overflow in archive_write_zip_header

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.

Source published
21 Jul 2026 22:41:38 UTC
Source modified
6 Nov 2026 18:05:30 UTC
Saved here
6 Nov 2026 20:10:08 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 2.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

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