HighFix available

DEBIAN-CVE-2026-48959

Type: advisorySource: OSV1 source record

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.

Announced 27 May 2026Group revision 1

Original source ↗

DEBIAN-CVE-2026-48959

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-48959

libio-compress-perl

Source reference: /affected/0/package/name

Affected versions: 2.204-1
Source reference: /affected/0/versions
Fixed versions: 2.204-1+deb12u1
Source reference: /affected/0/ranges
Prerequisites: Not stated in this record

libio-compress-perl

Source reference: /affected/1/package/name

Affected versions: 2.213-1
Source reference: /affected/1/versions
Fixed versions: 2.213-1+deb13u1
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

libio-compress-perl

Source reference: /affected/2/package/name

Affected versions: 2.213-1
Source reference: /affected/2/versions
2.214-1
Source reference: /affected/2/versions
2.217-1
Source reference: /affected/2/versions
2.219-1
Source reference: /affected/2/versions
2.219-2
Source reference: /affected/2/versions
Fixed versions: 2.220-1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

perl

Source reference: /affected/3/package/name

Affected versions: 5.36.0-7
Source reference: /affected/3/versions
5.36.0-7+deb12u1
Source reference: /affected/3/versions
5.36.0-7+deb12u2
Source reference: /affected/3/versions
5.36.0-7+deb12u3
Source reference: /affected/3/versions
Fixed versions: 5.36.0-7+deb12u4
Source reference: /affected/3/ranges
Prerequisites: Not stated in this record

perl

Source reference: /affected/4/package/name

Affected versions: 5.40.1-6
Source reference: /affected/4/versions
Fixed versions: 5.40.1-6+deb13u1
Source reference: /affected/4/ranges
Prerequisites: Not stated in this record

perl

Source reference: /affected/5/package/name

Affected versions: 5.40.1-6
Source reference: /affected/5/versions
5.40.1-7
Source reference: /affected/5/versions
Fixed versions: 5.40.1-8
Source reference: /affected/5/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.204-1+deb12u1"
          }
        ]
      }
    ],
    "package": {
      "name": "libio-compress-perl",
      "purl": "pkg:deb/debian/libio-compress-perl?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.204-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48959.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
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          }
        ]
      }
    ],
    "package": {
      "name": "libio-compress-perl",
      "purl": "pkg:deb/debian/libio-compress-perl?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.213-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48959.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
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        "events": [
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          },
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          }
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      }
    ],
    "package": {
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    },
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      "2.213-1",
      "2.214-1",
      "2.217-1",
      "2.219-1",
      "2.219-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48959.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
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          }
        ]
      }
    ],
    "package": {
      "name": "perl",
      "purl": "pkg:deb/debian/perl?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "5.36.0-7",
      "5.36.0-7+deb12u1",
      "5.36.0-7+deb12u2",
      "5.36.0-7+deb12u3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48959.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
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          }
        ]
      }
    ],
    "package": {
      "name": "perl",
      "purl": "pkg:deb/debian/perl?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "5.40.1-6"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48959.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
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          }
        ]
      }
    ],
    "package": {
      "name": "perl",
      "purl": "pkg:deb/debian/perl?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "5.40.1-6",
      "5.40.1-7"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48959.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Related CVEs: CVE-2026-48959
Source reference: /upstream

Publisher severity

high

Source reference: /severity/0/score

Event: #83720 · Revision 1
Added to Heist Feed: Mon, 26 Oct 2026 21:38:27 GMT
Publisher date: Wed, 27 May 2026 04:16:31 GMT

Read the original announcement

Revision history

26 Oct 2026DEBIAN-CVE-2026-48959 · Revision 1Source updated