CVE-2026-48959
Published: May 29, 2026Last modified: June 2, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | perl | Vulnerable (5.36.0-r0) |
| 25 LTS | perl | Fixed (5.40.4-r1) | |
| Stream | perl | Fixed (5.42.2-r1) | |
| Hardened Containers | 23 LTS | perl | Vulnerable (5.36.0-r0) |
| 25 LTS | perl | Vulnerable (5.40.2-r0) | |
| Stream | perl | Fixed (5.42.2-r1) |