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7.5 High

CVE-2026-48959 IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward

Description

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

Affected products and versions

Product Affected versions Fixed in
IO::Uncompress::Unzip 2.220 earliest → < 2.220 2.220

References

Timeline

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Other CVEs of IO::Uncompress::Unzip

The 2 CVEs of IO::Uncompress::Unzip →
CVE-2025-15649 IO::Uncompress::Unzip versions before 2.215 for Perl propagate uncaught exception when parsing zip header with malformed… 5.5 Medium
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