Vulnerability-Lookup

GHSA-7VXX-5GQR-7R44

Vulnerability from github – Published: 2026-05-27 06:31 – Updated: 2026-05-27 09:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-48959"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-407"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T04:16:31Z",
    "severity": null
  },
  "details": "IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward.\n\nfastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration.\n\nExtracting a named entry from an attacker supplied zip via IO::Uncompress::Unzip-\u003enew($zip, Name =\u003e $target) drives a per-byte read loop scaling with the entry\u0027s compressed size, up to the non-Zip64 4 GiB cap.",
  "id": "GHSA-7vxx-5gqr-7r44",
  "modified": "2026-05-27T09:31:12Z",
  "published": "2026-05-27T06:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48959"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pmqs/IO-Compress/commit/68db44076f4c1a86a2ffe53a958eac6cabaf72e2.patch"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/PMQS/IO-Compress-2.220/changes"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/27/2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-48959 (GCVE-0-2026-48959)

Vulnerability from cvelistv5 – Published: 2026-05-27 02:29 – Updated: 2026-05-27 07:24

Title

IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward

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.

Severity

No CVSS data available.

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

CPANSec

References

2 references

URL	Tags
https://github.com/pmqs/IO-Compress/commit/68db44…	patch
https://metacpan.org/release/PMQS/IO-Compress-2.2…	release-notes

Impacted products

1 product

Vendor	Product	Version
PMQS	IO::Uncompress::Unzip	Affected: 0 , < 2.220 (custom)

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JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-05-27T07:24:56.426Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/05/27/2"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward.\n\nfastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration.\n\nExtracting a named entry from an attacker supplied zip via IO::Uncompress::Unzip-\u003enew($zip, Name =\u003e $target) drives a per-byte read loop scaling with the entry\u0027s compressed size, up to the non-Zip64 4 GiB cap."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-407",
              "description": "CWE-407 Inefficient Algorithmic Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T02:29:07.027Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/pmqs/IO-Compress/commit/68db44076f4c1a86a2ffe53a958eac6cabaf72e2.patch"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/PMQS/IO-Compress-2.220/changes"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to IO-Compress 2.220 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-05-14T00:00:00.000Z",
          "value": "Issue reported."
        },
        {
          "lang": "en",
          "time": "2026-05-16T00:00:00.000Z",
          "value": "Version 2.220 released."
        }
      ],
      "title": "IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward",
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-48959",
    "datePublished": "2026-05-27T02:29:07.027Z",
    "dateReserved": "2026-05-26T18:09:32.365Z",
    "dateUpdated": "2026-05-27T07:24:56.426Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-7VXX-5GQR-7R44

CVE-2026-48959 (GCVE-0-2026-48959)

Tags

Sightings

Nomenclature