CVE-2026-48961

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.

• libio-compress-perl 2.220-1 (bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1138052) [trixie] - libio-compress-perl 2.213-1+deb13u1 [bookworm] - libio-compress-perl (Vulnerable code introduced later) [bullseye] - libio-compress-perl (Vulnerable code introduced later)
• perl 5.40.1-8 (bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1138855) [trixie] - perl 5.40.1-6+deb13u1 https://lists.security.metacpan.org/cve-announce/msg/40434383/ Introduced with: https://github.com/pmqs/IO-Compress/commit/ddfe67584a228877e5d28840da75ff32e435a5e3 (v2.207) Fixed by: https://github.com/pmqs/IO-Compress/commit/33c89d03d6e746ed2ead4f2f6570d47864c61bc7 (v2.220)