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Fencer Intel
high 7.3

CVE-2026-48961 json

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

published 5mo ago modified 3mo ago also EUVD-2026-32044

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

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.

Patch / fix

  • PMQS IO::Compress 2.220
  • perl Debian 13 5.40.1-6+deb13u1
  • perl Debian 14 5.40.1-8
  • libio-compress-perl Debian 13 2.213-1+deb13u1
  • libio-compress-perl Debian 14 2.220-1

debian advisories DEBIAN-CVE-2026-48961

  • perl-IO-Compress openSUSE Leap 16.0 2.220.0-bp160.1.1
  • perl-IO-Compress openSUSE Tumbleweed 2.220.0-2.1

opensuse advisories openSUSE-SU-2026:21177-1openSUSE-SU-2026:10969-1

  • perl Alpine 3.24 5.42.3-r0

alpine advisories ALPINE-CVE-2026-48961

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-48961 updated cvss 5.0

perl-IO-Compress: IO::Compress: Denial of Service in zipdetails CLI tool via malformed Info-ZIP Unix Extra Field

  • Red Hat Enterprise Linux 7 perl-IO-Compress
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 perl-IO-Compress Red Hat Enterprise Linux 9 perl-IO-Compress Red Hat Enterprise Linux 10 perl-IO-Compress
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
5mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CNA 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

  • PMQS IO::Compress

Classification

Weakness
  • CWE-755 Improper Handling of Exceptional Conditions

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.