Vulnerability-Lookup

GHSA-X3MF-3F47-PGPF

Vulnerability from github – Published: 2026-10-28 18:32 – Updated: 2026-10-28 18:32

Details

MIME::Parser::FileUnder versions before 5.521 for Perl reuse a pre-created output directory and follow symlinks in it, letting local users redirect attachment writes.

Each message is written to a directory named msg--- under the output base, and an existing directory of that name is used as is. A file name counts as unused when nothing exists at that path, which holds for a dangling symlink, and the body file is then opened in a way that follows the link.

When the output base is writable by other users, as with output_under("/tmp"), a local user can pre-create the directory with a symlink named like an attachment. The parser then writes the attachment to the link target with the privileges of the parsing process.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-116271"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-59"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-28T18:17:13Z",
    "severity": null
  },
  "details": "MIME::Parser::FileUnder versions before 5.521 for Perl reuse a pre-created output directory and follow symlinks in it, letting local users redirect attachment writes.\n\nEach message is written to a directory named msg-\u003ctime\u003e-\u003cpid\u003e-\u003cn\u003e under the output base, and an existing directory of that name is used as is. A file name counts as unused when nothing exists at that path, which holds for a dangling symlink, and the body file is then opened in a way that follows the link.\n\nWhen the output base is writable by other users, as with output_under(\"/tmp\"), a local user can pre-create the directory with a symlink named like an attachment. The parser then writes the attachment to the link target with the privileges of the parsing process.",
  "id": "GHSA-x3mf-3f47-pgpf",
  "modified": "2026-10-28T18:32:13Z",
  "published": "2026-10-28T18:32:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116271"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/DSKOLL/MIME-tools-5.521/changes"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-116271 (GCVE-0-2026-116271)

Vulnerability from cvelistv5 – Published: 2026-10-28 17:34 – Updated: 2026-10-28 17:34

Title

MIME::Parser::FileUnder versions before 5.521 for Perl reuse a pre-created output directory and follow symlinks in it, letting local users redirect attachment writes

Summary

MIME::Parser::FileUnder versions before 5.521 for Perl reuse a pre-created output directory and follow symlinks in it, letting local users redirect attachment writes. Each message is written to a directory named msg-<time>-<pid>-<n> under the output base, and an existing directory of that name is used as is. A file name counts as unused when nothing exists at that path, which holds for a dangling symlink, and the body file is then opened in a way that follows the link. When the output base is writable by other users, as with output_under("/tmp"), a local user can pre-create the directory with a symlink named like an attachment. The parser then writes the attachment to the link target with the privileges of the parsing process.

Severity

No CVSS data available.

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

CPANSec CNA under the redhat root

CNA scorecard C 62/100 over 346 records in the last 180 days details

References

1 reference

URL	Tags
https://metacpan.org/release/DSKOLL/MIME-tools-5.…	release-notes

Impacted products

1 product

Vendor	Product	Version
		Affected: 0 , < 5.521 (custom)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "MIME::Parser::FileUnder"
          ],
          "packageName": "MIME-tools",
          "packageURL": "pkg:cpan/MIME-tools",
          "programFiles": [
            "lib/MIME/Parser/Filer.pm",
            "lib/MIME/Body.pm"
          ],
          "programRoutines": [
            {
              "name": "MIME::Parser::FileUnder::init_parse"
            },
            {
              "name": "MIME::Parser::Filer::find_unused_path"
            }
          ],
          "repo": "https://salsa.debian.org/dskoll/mime-tools",
          "versions": [
            {
              "lessThan": "5.521",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "MIME::Parser::FileUnder versions before 5.521 for Perl reuse a pre-created output directory and follow symlinks in it, letting local users redirect attachment writes.\n\nEach message is written to a directory named msg-\u003ctime\u003e-\u003cpid\u003e-\u003cn\u003e under the output base, and an existing directory of that name is used as is. A file name counts as unused when nothing exists at that path, which holds for a dangling symlink, and the body file is then opened in a way that follows the link.\n\nWhen the output base is writable by other users, as with output_under(\"/tmp\"), a local user can pre-create the directory with a symlink named like an attachment. The parser then writes the attachment to the link target with the privileges of the parsing process."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "CWE-59 Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-28T17:34:06.757Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/DSKOLL/MIME-tools-5.521/changes"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to MIME-tools 5.521 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "MIME::Parser::FileUnder versions before 5.521 for Perl reuse a pre-created output directory and follow symlinks in it, letting local users redirect attachment writes",
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-116271",
    "datePublished": "2026-10-28T17:34:06.757Z",
    "dateReserved": "2026-10-25T18:05:02.236Z",
    "dateUpdated": "2026-10-28T17:34:06.757Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.

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