Description
IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward.
fastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration.
Extracting a named entry from an attacker supplied zip via IO::Uncompress::Unzip->new($zip, Name => $target) drives a per-byte read loop scaling with the entry's compressed size, up to the non-Zip64 4 GiB cap.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| PMQS | IO::Uncompress::Unzip | < 2.220 | 2.220 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libio-compress-perl | 2.220-1 | — |
| Debian 14 | perl | 5.40.1-8 | — |
| Debian 13 | libio-compress-perl | 2.213-1+deb13u1 | — |
| Debian 13 | perl | 5.40.1-6+deb13u1 | — |
| Debian 12 | libio-compress-perl | 2.204-1+deb12u1 | — |
| Debian 12 | perl | 5.36.0-7+deb12u4 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | perl +1 | No fix yet | — |
| Ubuntu 26.04 LTS | perl +1 | No fix yet | — |
| Ubuntu 25.10 | perl +1 | No fix yet | — |
| Ubuntu 24.04 LTS | libio-compress-perl | No fix yet | — |
| Ubuntu 24.04 LTS | perl | 5.38.2-3.2ubuntu0.4 | USN-8684-1 |
| Ubuntu 22.04 LTS | perl +1 | No fix yet | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libio-compress-perl | No fix yet | — |
| Ubuntu 18.04 LTS | libio-compress-perl | No fix yet | — |
| Ubuntu 16.04 LTS | libio-compress-perl | No fix yet | — |
| Ubuntu Pro 20.04 LTS | perl | No fix yet | — |
| Ubuntu Pro 18.04 LTS | perl | No fix yet | — |
| Ubuntu Pro 16.04 LTS | perl | No fix yet | — |
| Ubuntu Pro 14.04 LTS | perl | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | perl | 5.42.3-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | perl-IO-Compress +1 | 2.217-1.amzn2023.0.2 | ALAS2023-2026-1825 |
| Amazon Linux 2 | perl-IO-Compress | 2.061-2.amzn2.0.1 | ALAS2-2026-3355 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | perl | 5.38.2-512 | — |
Advisories 6
- SSA-457936 SSA-457936: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.7 Siemens ProductCERT · Nov 10, 2026
- WID-SEC-2026-2858 IBM AIX und VIOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 4, 2026
- USN-8684-1 perl vulnerabilities Ubuntu Security Notices (USN) · Aug 31, 2026
- NCSC-2026-0321 Meerdere kwetsbaarheden verholpen in IBM AIX en IBM PowerVM VIOS NCSC-NL (Netherlands) · Aug 21, 2026
- ALAS2-2026-3355 Important: perl-IO-Compress security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 22, 2026
- ALAS2023-2026-1825 Important: perl-IO-Compress security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 22, 2026