HighFix available
libio-compress-perl, perl — security advisory
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.
- Products
- libio-compress-perl, perl
- Affected versions
- 2.068-2, 2.069-1, 2.074-1, 2.087-1, 2.089-1, 2.090-1, 2.093-1, 2.101-1, 2.102-1, 2.206-1, 2.207-1, 2.213-1, 2.214-1, 2.217-1, 2.220-1, 2.221-1, 2.223-1, 5.14.2-21build1, 5.18.1-4, 5.18.1-4build1, 5.18.1-5, 5.18.2-2, 5.18.2-2ubuntu1, 5.18.2-2ubuntu1.1, 5.18.2-2ubuntu1.3, 5.18.2-2ubuntu1.4, 5.18.2-2ubuntu1.6, 5.18.2-2ubuntu1.7, 5.18.2-2ubuntu1.7+esm3, 5.18.2-2ubuntu1.7+esm4, 5.18.2-2ubuntu1.7+esm5, 5.18.2-2ubuntu1.7+esm7, 5.18.2-2ubuntu1.7+esm8, 5.18.2-2ubuntu1.7+esm9, 5.20.2-6, 5.22.1-3, 5.22.1-4, 5.22.1-5, 5.22.1-7, 5.22.1-8, 5.22.1-9, 5.22.1-9ubuntu0.2, 5.22.1-9ubuntu0.3, 5.22.1-9ubuntu0.5, 5.22.1-9ubuntu0.6, 5.22.1-9ubuntu0.9, 5.22.1-9ubuntu0.9+esm1, 5.22.1-9ubuntu0.9+esm2, 5.22.1-9ubuntu0.9+esm3, 5.22.1-9ubuntu0.9+esm4, 5.26.0-8ubuntu1, 5.26.1-2ubuntu1, 5.26.1-3, 5.26.1-4, 5.26.1-4build1, 5.26.1-5, 5.26.1-6, 5.26.1-6ubuntu0.1, 5.26.1-6ubuntu0.2, 5.26.1-6ubuntu0.3, 5.26.1-6ubuntu0.5, 5.26.1-6ubuntu0.6, 5.26.1-6ubuntu0.7, 5.26.1-6ubuntu0.7+esm2, 5.26.1-6ubuntu0.7+esm3, 5.26.1-6ubuntu0.7+esm4, 5.28.1-6build1, 5.30.0-7, 5.30.0-9, 5.30.0-9build1, 5.30.0-9ubuntu0.2, 5.30.0-9ubuntu0.3, 5.30.0-9ubuntu0.4, 5.30.0-9ubuntu0.5, 5.30.0-9ubuntu0.5+esm2, 5.30.0-9ubuntu0.5+esm3, 5.30.0-9ubuntu0.5+esm4, 5.32.1-3ubuntu3, 5.34.0-3ubuntu1, 5.34.0-3ubuntu1.1, 5.34.0-3ubuntu1.2, 5.34.0-3ubuntu1.3, 5.34.0-3ubuntu1.4, 5.34.0-3ubuntu1.5, 5.34.0-3ubuntu1.7, 5.34.0-3ubuntu1.8, 5.34.0-3ubuntu1.9, 5.36.0-10ubuntu1, 5.36.0-9ubuntu1, 5.38.2-3, 5.38.2-3.2, 5.38.2-3.2build1, 5.38.2-3.2build2, 5.38.2-3.2build2.1, 5.38.2-3.2ubuntu0.1, 5.38.2-3.2ubuntu0.2, 5.38.2-3.2ubuntu0.3, 5.40.1-2, 5.40.1-3, 5.40.1-5, 5.40.1-6, 5.40.1-6build1, 5.40.1-6ubuntu0.1, 5.40.1-7build1, 5.40.1-7ubuntu0.1, 5.40.1-7ubuntu0.2, 5.40.1-7ubuntu0.3, 5.40.1-8, 5.40.1-8ubuntu1, 5.42.3-1
- Fixed versions
- 5.38.2-3.2ubuntu0.4
- CVEs
- CVE-2026-48959
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:07 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-48959
perl
Fixed versions: Not specified
perl
Fixed versions: Not specified
libio-compress-perl
Fixed versions: Not specified
perl
Fixed versions: Not specified
libio-compress-perl
Fixed versions: Not specified
perl
Fixed versions: Not specified
libio-compress-perl
Fixed versions: Not specified
libio-compress-perl
Fixed versions: Not specified
perl
Fixed versions: Not specified
libio-compress-perl
Fixed versions: Not specified
perl
Fixed versions: 5.38.2-3.2ubuntu0.4
libio-compress-perl
Fixed versions: Not specified
perl
Fixed versions: Not specified
libio-compress-perl
Fixed versions: Not specified
perl
Fixed versions: Not specified
libio-compress-perl
Fixed versions: Not specified
perl
Fixed versions: Not specified
Complete source record
{
"id": "7c097b3c2a58225ed385f21da52aa407bf34a0ee75f12eff9824d8fbbb58ba83",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-48959",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-48959",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-48959",
"products": [
{
"name": {
"value": "perl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.14.2-21build1",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.1-4",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.1-4build1",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.1-5",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2ubuntu1.1",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2ubuntu1.3",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2ubuntu1.4",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2ubuntu1.6",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2ubuntu1.7",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2ubuntu1.7+esm3",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2ubuntu1.7+esm4",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2ubuntu1.7+esm5",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2ubuntu1.7+esm7",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2ubuntu1.7+esm8",
"evidence": "/affected/0/versions"
},
{
"value": "5.18.2-2ubuntu1.7+esm9",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "perl",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.20.2-6",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-3",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-4",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-5",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-7",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-8",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-9",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-9ubuntu0.2",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-9ubuntu0.3",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-9ubuntu0.5",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-9ubuntu0.6",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-9ubuntu0.9",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-9ubuntu0.9+esm1",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-9ubuntu0.9+esm2",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-9ubuntu0.9+esm3",
"evidence": "/affected/1/versions"
},
{
"value": "5.22.1-9ubuntu0.9+esm4",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "libio-compress-perl",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.068-2",
"evidence": "/affected/2/versions"
},
{
"value": "2.069-1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "perl",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.26.0-8ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-2ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-3",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-4",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-4build1",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-5",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-6",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-6ubuntu0.1",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-6ubuntu0.2",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-6ubuntu0.3",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-6ubuntu0.5",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-6ubuntu0.6",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-6ubuntu0.7",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-6ubuntu0.7+esm2",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-6ubuntu0.7+esm3",
"evidence": "/affected/3/versions"
},
{
"value": "5.26.1-6ubuntu0.7+esm4",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "libio-compress-perl",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.074-1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "perl",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.28.1-6build1",
"evidence": "/affected/5/versions"
},
{
"value": "5.30.0-7",
"evidence": "/affected/5/versions"
},
{
"value": "5.30.0-9",
"evidence": "/affected/5/versions"
},
{
"value": "5.30.0-9build1",
"evidence": "/affected/5/versions"
},
{
"value": "5.30.0-9ubuntu0.2",
"evidence": "/affected/5/versions"
},
{
"value": "5.30.0-9ubuntu0.3",
"evidence": "/affected/5/versions"
},
{
"value": "5.30.0-9ubuntu0.4",
"evidence": "/affected/5/versions"
},
{
"value": "5.30.0-9ubuntu0.5",
"evidence": "/affected/5/versions"
},
{
"value": "5.30.0-9ubuntu0.5+esm2",
"evidence": "/affected/5/versions"
},
{
"value": "5.30.0-9ubuntu0.5+esm3",
"evidence": "/affected/5/versions"
},
{
"value": "5.30.0-9ubuntu0.5+esm4",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "libio-compress-perl",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.087-1",
"evidence": "/affected/6/versions"
},
{
"value": "2.089-1",
"evidence": "/affected/6/versions"
},
{
"value": "2.090-1",
"evidence": "/affected/6/versions"
},
{
"value": "2.093-1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "libio-compress-perl",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.101-1",
"evidence": "/affected/7/versions"
},
{
"value": "2.102-1",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "perl",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.32.1-3ubuntu3",
"evidence": "/affected/8/versions"
},
{
"value": "5.34.0-3ubuntu1",
"evidence": "/affected/8/versions"
},
{
"value": "5.34.0-3ubuntu1.1",
"evidence": "/affected/8/versions"
},
{
"value": "5.34.0-3ubuntu1.2",
"evidence": "/affected/8/versions"
},
{
"value": "5.34.0-3ubuntu1.3",
"evidence": "/affected/8/versions"
},
{
"value": "5.34.0-3ubuntu1.4",
"evidence": "/affected/8/versions"
},
{
"value": "5.34.0-3ubuntu1.5",
"evidence": "/affected/8/versions"
},
{
"value": "5.34.0-3ubuntu1.7",
"evidence": "/affected/8/versions"
},
{
"value": "5.34.0-3ubuntu1.8",
"evidence": "/affected/8/versions"
},
{
"value": "5.34.0-3ubuntu1.9",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "libio-compress-perl",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.206-1",
"evidence": "/affected/9/versions"
},
{
"value": "2.207-1",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "perl",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.38.2-3.2ubuntu0.4",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": [
{
"value": "5.36.0-9ubuntu1",
"evidence": "/affected/10/versions"
},
{
"value": "5.36.0-10ubuntu1",
"evidence": "/affected/10/versions"
},
{
"value": "5.38.2-3",
"evidence": "/affected/10/versions"
},
{
"value": "5.38.2-3.2",
"evidence": "/affected/10/versions"
},
{
"value": "5.38.2-3.2build1",
"evidence": "/affected/10/versions"
},
{
"value": "5.38.2-3.2build2",
"evidence": "/affected/10/versions"
},
{
"value": "5.38.2-3.2build2.1",
"evidence": "/affected/10/versions"
},
{
"value": "5.38.2-3.2ubuntu0.1",
"evidence": "/affected/10/versions"
},
{
"value": "5.38.2-3.2ubuntu0.2",
"evidence": "/affected/10/versions"
},
{
"value": "5.38.2-3.2ubuntu0.3",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "libio-compress-perl",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.213-1",
"evidence": "/affected/11/versions"
}
]
},
{
"name": {
"value": "perl",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.40.1-2",
"evidence": "/affected/12/versions"
},
{
"value": "5.40.1-3",
"evidence": "/affected/12/versions"
},
{
"value": "5.40.1-5",
"evidence": "/affected/12/versions"
},
{
"value": "5.40.1-6",
"evidence": "/affected/12/versions"
},
{
"value": "5.40.1-6build1",
"evidence": "/affected/12/versions"
},
{
"value": "5.40.1-6ubuntu0.1",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "libio-compress-perl",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.217-1",
"evidence": "/affected/13/versions"
},
{
"value": "2.220-1",
"evidence": "/affected/13/versions"
},
{
"value": "2.221-1",
"evidence": "/affected/13/versions"
},
{
"value": "2.223-1",
"evidence": "/affected/13/versions"
}
]
},
{
"name": {
"value": "perl",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.40.1-7build1",
"evidence": "/affected/14/versions"
},
{
"value": "5.40.1-8",
"evidence": "/affected/14/versions"
},
{
"value": "5.40.1-8ubuntu1",
"evidence": "/affected/14/versions"
},
{
"value": "5.42.3-1",
"evidence": "/affected/14/versions"
}
]
},
{
"name": {
"value": "libio-compress-perl",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.213-1",
"evidence": "/affected/15/versions"
},
{
"value": "2.214-1",
"evidence": "/affected/15/versions"
},
{
"value": "2.217-1",
"evidence": "/affected/15/versions"
}
]
},
{
"name": {
"value": "perl",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.40.1-6build1",
"evidence": "/affected/16/versions"
},
{
"value": "5.40.1-7build1",
"evidence": "/affected/16/versions"
},
{
"value": "5.40.1-7ubuntu0.1",
"evidence": "/affected/16/versions"
},
{
"value": "5.40.1-7ubuntu0.2",
"evidence": "/affected/16/versions"
},
{
"value": "5.40.1-7ubuntu0.3",
"evidence": "/affected/16/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-48959",
"aliases": [
"UBUNTU-CVE-2026-48959"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "perl",
"purl": "pkg:deb/ubuntu/perl?arch=source&distro=esm-infra-legacy%2Ftrusty",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"5.14.2-21build1",
"5.18.1-4",
"5.18.1-4build1",
"5.18.1-5",
"5.18.2-2",
"5.18.2-2ubuntu1",
"5.18.2-2ubuntu1.1",
"5.18.2-2ubuntu1.3",
"5.18.2-2ubuntu1.4",
"5.18.2-2ubuntu1.6",
"5.18.2-2ubuntu1.7",
"5.18.2-2ubuntu1.7+esm3",
"5.18.2-2ubuntu1.7+esm4",
"5.18.2-2ubuntu1.7+esm5",
"5.18.2-2ubuntu1.7+esm7",
"5.18.2-2ubuntu1.7+esm8",
"5.18.2-2ubuntu1.7+esm9"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48959.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcgi-fast-perl",
"binary_version": "5.18.2-2ubuntu1.7+esm9"
},
{
"binary_name": "libperl5.18",
"binary_version": "5.18.2-2ubuntu1.7+esm9"
},
{
"binary_name": "perl",
"binary_version": "5.18.2-2ubuntu1.7+esm9"
},
{
"binary_name": "perl-base",
"binary_version": "5.18.2-2ubuntu1.7+esm9"
},
{
"binary_name": "perl-debug",
"binary_version": "5.18.2-2ubuntu1.7+esm9"
},
{
"binary_name": "perl-modules",
"binary_version": "5.18.2-2ubuntu1.7+esm9"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
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],
"modified": "2026-10-17T13:00:23.966328864Z",
"provider": "osv",
"upstream": [
"CVE-2026-48959"
],
"references": [
"https://ubuntu.com/security/CVE-2026-48959",
"https://www.cve.org/CVERecord?id=CVE-2026-48959",
"https://lists.security.metacpan.org/cve-announce/msg/40434381/",
"https://github.com/pmqs/IO-Compress/commit/68db44076f4c1a86a2ffe53a958eac6cabaf72e2.patch",
"https://metacpan.org/release/PMQS/IO-Compress-2.220/changes",
"https://ubuntu.com/security/notices/USN-8684-1"
]
},
"related_cves": [
{
"value": "CVE-2026-48959",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360496,
"published_at": "2026-05-27T04:16:00+00:00"
}