Hi,

The following vulnerability was published for libio-compress-perl.

CVE-2026-48961[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-48961
https://www.cve.org/CVERecord?id=CVE-2026-48961
[1] https://lists.security.metacpan.org/cve-announce/msg/40434383/
[2] https://github.com/pmqs/IO-Compress/commit/33c89d03d6e746ed2ead4f2f6570d47864c61bc7

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

We believe that the bug you reported is fixed in the latest version of
libio-compress-perl, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1138052@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
gregor herrmann <gregoa@debian.org> (supplier of updated libio-compress-perl package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Wed, 27 May 2026 19:42:45 +0200
Source: libio-compress-perl
Architecture: source
Version: 2.220-1
Distribution: unstable
Urgency: medium
Maintainer: Debian Perl Group <pkg-perl-maintainers@lists.alioth.debian.org>
Changed-By: gregor herrmann <gregoa@debian.org>
Closes: 1138051 1138052 1138055
Changes:
 libio-compress-perl (2.220-1) unstable; urgency=medium
 .
   * Import upstream version 2.220.
     Fix CVE-2026-48959, CVE-2026-48961, CVE-2026-48962.
     Closes: #1138051, #1138052, #1138055.
   * Declare compliance with Debian Policy 4.7.4.
   * Drop lintian overrides for removed tags.
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# CVE-2026-48962 in IO-Compress: all suites affected
clone 1138055 -1
reassign -1 perl 5.40.1-6
found -1 5.32.1-4
found -1 5.36.0-1
found -1 5.42.2-1

# CVE-2026-48961 in IO-Compress: reported as introduced in 2.207 so trixie onwards
clone 1138052 -2
reassign -2 perl 5.40.1-6
found -2 5.42.2-1

# CVE-2026-48959 in IO-Compress: all suites affected
clone 1138051 -3
reassign -3 perl 5.40.1-6
found -3 5.32.1-4
found -3 5.36.0-1
found -3 5.42.2-1

thanks

We believe that the bug you reported is fixed in the latest version of
perl, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1138855@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Niko Tyni <ntyni@debian.org> (supplier of updated perl package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sat, 06 Jun 2026 17:22:29 +0300
Source: perl
Architecture: source
Version: 5.40.1-8
Distribution: unstable
Urgency: medium
Maintainer: Niko Tyni <ntyni@debian.org>
Changed-By: Niko Tyni <ntyni@debian.org>
Closes: 1137345 1138854 1138855 1138856 1138858 1138863 1138905 1138906
Changes:
 perl (5.40.1-8) unstable; urgency=medium
 .
   * [SECURITY] backport various fixes from upstream:
     + CVE-2025-15649: header parsing in IO::Uncompress::Unzip.
         (Closes: #1138863)
     + CVE-2026-7010:  CRLF-validation in HTTP::Tiny.
         (Closes: #1138858)
     + CVE-2026-8376:  Buffer overflow in Perl_study_chunk.
         (Closes: #1137345)
     + CVE-2026-48959: CPU exhaustion in IO::Uncompress::Unzip.
         (Closes: #1138856)
     + CVE-2026-48961: crash in zipdetails.
         (Closes: #1138855)
     + CVE-2026-48962: code execution in IO-Compress via output globs.
         (Closes: #1138854)
     + buffer overflows in pack().
         (Closes: #1138905)
     + buffer overflow in Storable.
         (Closes: #1138906)
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We believe that the bug you reported is fixed in the latest version of
perl, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1138855@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Niko Tyni <ntyni@debian.org> (supplier of updated perl package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sat, 06 Jun 2026 18:02:30 +0300
Source: perl
Architecture: source
Version: 5.42.2-2
Distribution: experimental
Urgency: medium
Maintainer: Niko Tyni <ntyni@debian.org>
Changed-By: Niko Tyni <ntyni@debian.org>
Closes: 1137345 1138854 1138855 1138856 1138858 1138863 1138905 1138906
Changes:
 perl (5.42.2-2) experimental; urgency=medium
 .
   * [SECURITY] backport various fixes from upstream:
     + CVE-2025-15649: header parsing in IO::Uncompress::Unzip.
         (Closes: #1138863)
     + CVE-2026-7010:  CRLF-validation in HTTP::Tiny.
         (Closes: #1138858)
     + CVE-2026-8376:  Buffer overflow in Perl_study_chunk.
         (Closes: #1137345)
     + CVE-2026-48959: CPU exhaustion in IO::Uncompress::Unzip.
         (Closes: #1138856)
     + CVE-2026-48961: crash in zipdetails.
         (Closes: #1138855)
     + CVE-2026-48962: code execution in IO-Compress via output globs.
         (Closes: #1138854)
     + buffer overflows in pack().
         (Closes: #1138905)
     + buffer overflow in Storable.
         (Closes: #1138906)
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