CVE-2026-16517

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.

• libarchive https://bugzilla.redhat.com/show_bug.cgi?id=2505492 https://github.com/libarchive/libarchive/issues/3225 https://github.com/libarchive/libarchive/pull/3228 Fixed by: https://github.com/libarchive/libarchive/commit/1c6e7b491f60fce335c20a9692f870d1f1ca39aa