PT-2026-43486 · Cpan · Io::Uncompress::Unzip

Stig Palmquist · Published 2026-05-27 · Updated 2026-06-25 · CVE-2026-48959

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions IO::Uncompress::Unzip versions prior to 2.220

Description An issue in the fastForward() function allows CPU exhaustion. The function compares the length of the $offset variable (the digit count of the offset, ranging from 1 to 19) against the chunk size $c instead of comparing the $offset value itself. This causes the chunk size $c to shrink from 16 KiB to between 1 and 19 bytes per iteration. An attacker can trigger a per-byte read loop that scales with the compressed size of an entry, up to the 4 GiB non-Zip64 limit, by extracting a named entry from a malicious zip file using IO::Uncompress::Unzip->new($zip, Name => $target).

Recommendations Update to version 2.220 or later.

Exploit

Fix

Weakness Enumeration

CWE-407

Related Identifiers

CVE-2026-48959

ECHO-C2DC-1C4D-E477

Affected Products

Io::Uncompress::Unzip

References · 23

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48959.json · Exploit
• https://github.com/pmqs/IO-Compress/commit/68db44076f4c1a86a2ffe53a958eac6cabaf72e2.patch · Patch
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2026-48959 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-48959 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-48959 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-48959 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-48959 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-13-CVE-2026-48959 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-48959 · Security Note
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2026-48959 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-48959 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-48959 · Security Note
• https://ubuntu.com/security/CVE-2026-48959 · Vendor Advisory
• https://github.com/pmqs/IO-Compress · Note
• https://docs.bell-sw.com/security/cves/CVE-2026-48959 · Note