CVE-2026-48959

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductIO::Uncompress::Unzip

PublishedMay 27, 2026

First seenMay 27, 2026

Weakness typeCWE-407CWE-407

How to fix

Update

PMQS IO::Uncompress::Unzip2.220 or later

Patches

github.com/pmqs/IO-Compress/commit/68db44076f4c1a86a2ffe53a958eac6cabaf72e2.patch

Vendor advisories

metacpan.org/release/PMQS/IO-Compress-2.220/changes

Affected products

Product	Affected versions	Fixed in
PMQS IO::Uncompress::Unzip	v < 2.220	2.220

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