CPANSA-IO-Compress-2026-48961: IO-Compress vulnerability
| Publisher | giterlizzi | Document category | csaf_security_advisory |
|---|---|---|---|
| Initial release date | 2026-05-27T00:00:00 | Engine | CSAF Perl Toolkit 0.26 |
| Current release date | 2026-05-27T00:00:00 | Build Date | |
| Current version | 1 | Status | final |
| CVSS v3.1 Base Score | 7.3 | Severity | |
| Original language | Language | en | |
| Also referred to | |||
Vulnerability 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.
Vulnerabilities
CVE-2026-48961
Vulnerability DescriptionIO::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.
| Weakness | CWE-755 : Improper Handling of Exceptional Conditions |
|---|
Product status
Known affected
| Product | Score | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| IO-Compress greater than or equal 2.207 and less than 2.220 |
|
Fixed
- IO-Compress greater than or equal 2.220
giterlizzi
Namespace: https://github.com/giterlizzi/
gdt@cpan.org
References
- CPANSA-IO-Compress-2026-48961 JSON self
https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-io-compress-2026-48961.json - https://github.com/pmqs/IO-Compress/commit/33c89d03d6e746ed2ead4f2f6570d47864c61bc7.patch external
https://github.com/pmqs/IO-Compress/commit/33c89d03d6e746ed2ead4f2f6570d47864c61bc7.patch - https://metacpan.org/release/PMQS/IO-Compress-2.220/changes external
https://metacpan.org/release/PMQS/IO-Compress-2.220/changes - http://www.openwall.com/lists/oss-security/2026/05/27/3 external
http://www.openwall.com/lists/oss-security/2026/05/27/3 - CVE-2026-48961 (NVD) external
https://nvd.nist.gov/vuln/detail/CVE-2026-48961
Revision history
| Version | Date of the revision | Summary of the revision |
|---|---|---|
| 1 | Wed May 27 00:00:00 2026 | First release |
Sharing rules
TLP:WHITE
For the TLP version see: https://www.first.org/tlp/