CVE-2026-48959

IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward.<br /> <br /> fastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration.<br /> <br /> Extracting a named entry from an attacker supplied zip via IO::Uncompress::Unzip-&gt;new($zip, Name =&gt; $target) drives a per-byte read loop scaling with the entry&amp;#39;s compressed size, up to the non-Zip64 4 GiB cap.