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Vulnerability · Published May 27, 2026 · Assigned by CPANSec

CVE-2026-48961IO::Compress versions from 2.207 before 2.220 for Perl ship a zipdetails CLI tool that crashes with undefined subroutine on Info-ZIP Unix Extra Field with 8-byte UID or GID

High 7.3

In plain English

A high-severity security flaw in IO::Compress from PMQS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.3%top 81.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

IO::Compress versions from 2.207 before 2.220 for Perl ship a zipdetails CLI tool that crashes with undefined subroutine on Info-ZIP Unix Extra Field with 8-byte UID or GID. When decode_ux() in bin/zipdetails handles an Info-ZIP Unix Extra Field (tag 0x7875) with UID Size or GID Size set to 8, causing zipdetails to decode an 8-byte UID or GID value, it dispatches through decodeLitteEndian(), which calls a misnamed helper unpackValueQ. The actual function defined in the same file is unpackValue_Q (with underscore); the call raises 'Undefined subroutine &main::unpackValueQ' and the script exits with status 255. Library callers of IO::Compress and IO::Uncompress are not affected; the defect is in the bundled CLI tool.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.24perl5.42.3-r0ALPINE-CVE-2026-48961
Debian:13libio-compress-perl2.213-1+deb13u1DEBIAN-CVE-2026-48961
Debian:14libio-compress-perl2.220-1DEBIAN-CVE-2026-48961
Debian:13perl5.40.1-6+deb13u1DEBIAN-CVE-2026-48961
Debian:14perl5.40.1-8DEBIAN-CVE-2026-48961
Ubuntu:22.04:LTSlibio-compress-perlno fix listedUBUNTU-CVE-2026-48961
Ubuntu:24.04:LTSlibio-compress-perlno fix listedUBUNTU-CVE-2026-48961
Ubuntu:25.10libio-compress-perlno fix listedUBUNTU-CVE-2026-48961
Ubuntu:26.04:LTSlibio-compress-perlno fix listedUBUNTU-CVE-2026-48961
Ubuntu:26.10libio-compress-perlno fix listedUBUNTU-CVE-2026-48961
Ubuntu:22.04:LTSperlno fix listedUBUNTU-CVE-2026-48961
Ubuntu:25.10perlno fix listedUBUNTU-CVE-2026-48961
Ubuntu:26.04:LTSperlno fix listedUBUNTU-CVE-2026-48961
Ubuntu:26.10perlno fix listedUBUNTU-CVE-2026-48961

Affected products (as reported)

VendorProductVersions
PMQS IO::Compress 2.207 – before 2.220

Weakness: CWE-755 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References