# CVE-2026-48961: libio-compress-perl: IO::Compress versions from 2.207 before 2.220 for Perl ship a zipdetails CLI tool that crashes with undefined subrout...

CVE-2026-48961 is fixed in 8 products on 1 platform, first by ALAS2023-2026-1825, released June 11, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-48961
- Priority: High
- CVSS: 7.3 (high)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 27, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libio-compress-perl Debian 13.5 (trixie) | 2.213-1+deb13u1 | [DEBIAN-CVE-2026-48961](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48961.md) | Jun 24, 2026 |
| Linux | libio-compress-perl Debian 14 | 2.220-1 | [DEBIAN-CVE-2026-48961](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48961.md) | Jun 24, 2026 |
| Linux | perl Debian 13.5 (trixie) | 5.40.1-6+deb13u1 | [DEBIAN-CVE-2026-48961](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48961.md) | Jun 24, 2026 |
| Linux | perl Debian 14 | 5.40.1-8 | [DEBIAN-CVE-2026-48961](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48961.md) | Jun 24, 2026 |
| Linux | perl-Compress-Raw-Bzip2 Fedora 43 | 2.218-1.fc43 | [FEDORA-2026-FB1F15CE04](https://patchblox.com/security/data/fix/linux/fedora-2026-fb1f15ce04.md) | Jun 22, 2026 |
| Linux | perl-Compress-Raw-Bzip2-debuginfo Fedora 43 | 2.218-1.fc43 | [FEDORA-2026-FB1F15CE04](https://patchblox.com/security/data/fix/linux/fedora-2026-fb1f15ce04.md) | Jun 22, 2026 |
| Linux | perl-Compress-Raw-Bzip2-debugsource Fedora 43 | 2.218-1.fc43 | [FEDORA-2026-FB1F15CE04](https://patchblox.com/security/data/fix/linux/fedora-2026-fb1f15ce04.md) | Jun 22, 2026 |
| Linux | perl-Compress-Raw-Bzip2-tests Fedora 43 | 2.218-1.fc43 | [FEDORA-2026-FB1F15CE04](https://patchblox.com/security/data/fix/linux/fedora-2026-fb1f15ce04.md) | Jun 22, 2026 |
| Linux | perl-IO-Compress Fedora 43 | 2.221-1.fc43 | [FEDORA-2026-FB1F15CE04](https://patchblox.com/security/data/fix/linux/fedora-2026-fb1f15ce04.md) | Jun 22, 2026 |
| Linux | perl-IO-Compress amzn 2023 | 2.217-1.amzn2023.0.2 | [ALAS2023-2026-1825](https://patchblox.com/security/data/fix/linux/alas2023-2026-1825.md) | Jun 11, 2026 |
| Linux | perl-IO-Compress opensuse-leap 16.0 | 2.220.0-bp160.1.1 | [OPENSUSE-SU-2026:21177-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21177-1.md) | Jun 30, 2026 |
| Linux | perl-IO-Compress-tests Fedora 43 | 2.221-1.fc43 | [FEDORA-2026-FB1F15CE04](https://patchblox.com/security/data/fix/linux/fedora-2026-fb1f15ce04.md) | Jun 22, 2026 |
| Linux | perl-IO-Compress-tests amzn 2023 | 2.217-1.amzn2023.0.2 | [ALAS2023-2026-1825](https://patchblox.com/security/data/fix/linux/alas2023-2026-1825.md) | Jun 11, 2026 |

---

Data as of 2026-11-10T13:56:55Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.