Vulnerability details
CVE-2026-48959
PMQS IO::Uncompress::Unzip
IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward
CVSS 3.1
7.5High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| PMQS | IO::Uncompress::Unzip | v < 2.220 | CVEProject cvelistV5 (CNA) |
References and advisories
3
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Details
- Published
- 2026-05-27
- Last updated
- 2026-05-29
- State
- Published
- Assigner (CNA)
- CPANSec
Exploit prediction (EPSS)
0.55%
Probability of exploitation in 30 days
46.3%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-407Inefficient Algorithmic Complexity