CVE Explorer
CVE-2026-48959
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
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"collectionURL":"https://cpan.org/modules","defaultStatus":"unaffected","packageName":"IO-Compress","product":"IO::Uncompress::Unzip","programFiles":["lib/IO/Uncompress/Unzip.pm"],"programRoutines":[{"name":"IO::Uncompress::Unzip::fastForward"}],"repo":"https://github.com/pmqs/IO-Compress","vendor":"PMQS","versions":[{"lessThan":"2.220","status":"affected","version":"0","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:a6430aa8dfa7d764f93569db62f36834cb349cc71d31986e6b7da394b5391da2 · sha256:fc441764d5329e87… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:a6430aa8dfa7d764f93569db62f36834cb349cc71d31986e6b7da394b5391da2 · sha256:fc441764d5329e87… · /containers/adp/1/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-407","description":"CWE-407 Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:a6430aa8dfa7d764f93569db62f36834cb349cc71d31986e6b7da394b5391da2 · sha256:fc441764d5329e87… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 source assertions{"url":"http://www.openwall.com/lists/oss-security/2026/05/27/2"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:a6430aa8dfa7d764f93569db62f36834cb349cc71d31986e6b7da394b5391da2 · sha256:fc441764d5329e87… · /containers/adp/0/references/0
{"tags":["patch"],"url":"https://github.com/pmqs/IO-Compress/commit/68db44076f4c1a86a2ffe53a958eac6cabaf72e2.patch"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:a6430aa8dfa7d764f93569db62f36834cb349cc71d31986e6b7da394b5391da2 · sha256:fc441764d5329e87… · /containers/cna/references/0
{"tags":["release-notes"],"url":"https://metacpan.org/release/PMQS/IO-Compress-2.220/changes"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:a6430aa8dfa7d764f93569db62f36834cb349cc71d31986e6b7da394b5391da2 · sha256:fc441764d5329e87… · /containers/cna/references/1
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.