Bug 2481765 (CVE-2026-48961)

Summary: CVE-2026-48961 perl-IO-Compress: IO::Compress: Denial of Service in zipdetails CLI tool via malformed Info-ZIP Unix Extra Field
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the `zipdetails` command-line interface (CLI) tool, bundled with IO::Compress for Perl. When processing a specially crafted Info-ZIP Unix Extra Field with an 8-byte User ID (UID) or Group ID (GID), the `zipdetails` tool attempts to call an undefined subroutine. This can lead to the tool crashing, resulting in a Denial of Service (DoS) for the user. This issue affects only the `zipdetails` CLI tool, not the IO::Compress library itself.
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Bug Depends On: 2489766    
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Description OSIDB Bzimport 2026-05-27 04:01:16 UTC 
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.