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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade libarchive | Sep 1, 2026 | Sep 1, 2026 |
| Redhat_linux | — | Upgrade libarchiveUpgrade libarchive-debuginfoUpgrade bsdunzip-debuginfoNo solution existsUpgrade bsdcpio-debuginfoUpgrade bsdtar-debuginfoUpgrade libarchive-debugsourceUpgrade libarchive-develUpgrade bsdtarUpgrade bsdcat-debuginfo | Jul 23, 2026 | Jul 3, 2026 |
| Rocky_linux | — | Upgrade libarchiveUpgrade bsdtar-debuginfoUpgrade bsdtarUpgrade libarchive-debugsourceUpgrade libarchive-debuginfoUpgrade libarchive-devel | Sep 28, 2026 | Sep 23, 2026 |
| Ubuntu | — | Upgrade libarchive13t64Upgrade libarchive13 | Oct 12, 2026 | Oct 8, 2026 |
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