Vulnerability-Lookup

GHSA-8FPV-59MJ-6JFR

Vulnerability from github – Published: 2026-09-22 03:30 – Updated: 2026-09-22 03:30

Details

Dancer2 versions before 2.2.0 for Perl serve a layout as a page when an equivalent spelling of its path misses the guard in the AutoPage handler.

The handler compares the request path against the layout directory name as text, while the lookup that follows canonicalises it. A doubled slash, a dot segment, a percent-encoded slash, or a different capitalisation on a case-insensitive filesystem therefore misses the guard.

The handler is off by default, enabled with auto_page. The layout wrapping every page is already public, so this discloses one of the application's other layouts.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-93709"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-41"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-22T01:16:55Z",
    "severity": null
  },
  "details": "Dancer2 versions before 2.2.0 for Perl serve a layout as a page when an equivalent spelling of its path misses the guard in the AutoPage handler.\n\nThe handler compares the request path against the layout directory name as text, while the lookup that follows canonicalises it. A doubled slash, a dot segment, a percent-encoded slash, or a different capitalisation on a case-insensitive filesystem therefore misses the guard.\n\nThe handler is off by default, enabled with auto_page. The layout wrapping every page is already public, so this discloses one of the application\u0027s other layouts.",
  "id": "GHSA-8fpv-59mj-6jfr",
  "modified": "2026-09-22T03:30:59Z",
  "published": "2026-09-22T03:30:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93709"
    },
    {
      "type": "WEB",
      "url": "https://github.com/PerlDancer/Dancer2/issues/1823"
    },
    {
      "type": "WEB",
      "url": "https://github.com/PerlDancer/Dancer2/commit/293fce08812b0928f34ab2d7b9357450707c3630.patch"
    },
    {
      "type": "WEB",
      "url": "https://github.com/PerlDancer/Dancer2/commit/753b385350a54acb8d4b686723890205268634a8.patch"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/CROMEDOME/Dancer2-2.2.0/changes"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/22/1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-93709 (GCVE-0-2026-93709)

Vulnerability from cvelistv5 – Published: 2026-09-22 00:50 – Updated: 2026-09-22 02:09

Title

Dancer2 versions before 2.2.0 for Perl serve a layout as a page when an equivalent spelling of its path misses the guard in the AutoPage handler

Summary

Dancer2 versions before 2.2.0 for Perl serve a layout as a page when an equivalent spelling of its path misses the guard in the AutoPage handler. The handler compares the request path against the layout directory name as text, while the lookup that follows canonicalises it. A doubled slash, a dot segment, a percent-encoded slash, or a different capitalisation on a case-insensitive filesystem therefore misses the guard. The handler is off by default, enabled with auto_page. The layout wrapping every page is already public, so this discloses one of the application's other layouts.

Severity

No CVSS data available.

CWE

CWE-41 - Improper Resolution of Path Equivalence

Assigner

CPANSec redhat root

References

5 references

URL	Tags
https://github.com/PerlDancer/Dancer2/issues/1823	issue-tracking
https://github.com/PerlDancer/Dancer2/commit/293f…	patch
https://github.com/PerlDancer/Dancer2/commit/753b…	patch
https://metacpan.org/release/CROMEDOME/Dancer2-2.…	release-notes
http://www.openwall.com/lists/oss-security/2026/09/22/1

Impacted products

1 product

Vendor	Product	Version
		Affected: 0 , < 2.2.0 (custom)

Show details on NVD website

JSON

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  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-09-22T02:09:44.163Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/09/22/1"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "Dancer2"
          ],
          "packageName": "Dancer2",
          "packageURL": "pkg:cpan/Dancer2",
          "programFiles": [
            "lib/Dancer2/Handler/AutoPage.pm"
          ],
          "programRoutines": [
            {
              "name": "Dancer2::Handler::AutoPage::code"
            }
          ],
          "repo": "https://github.com/PerlDancer/Dancer2",
          "versions": [
            {
              "lessThan": "2.2.0",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Dancer2 versions before 2.2.0 for Perl serve a layout as a page when an equivalent spelling of its path misses the guard in the AutoPage handler.\n\nThe handler compares the request path against the layout directory name as text, while the lookup that follows canonicalises it. A doubled slash, a dot segment, a percent-encoded slash, or a different capitalisation on a case-insensitive filesystem therefore misses the guard.\n\nThe handler is off by default, enabled with auto_page. The layout wrapping every page is already public, so this discloses one of the application\u0027s other layouts."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-41",
              "description": "CWE-41 Improper Resolution of Path Equivalence",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T00:50:45.117Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/PerlDancer/Dancer2/issues/1823"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/PerlDancer/Dancer2/commit/293fce08812b0928f34ab2d7b9357450707c3630.patch"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/PerlDancer/Dancer2/commit/753b385350a54acb8d4b686723890205268634a8.patch"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/CROMEDOME/Dancer2-2.2.0/changes"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to Dancer2 2.2.0 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-09-16T00:00:00.000Z",
          "value": "Version 2.2.0 released with fix."
        }
      ],
      "title": "Dancer2 versions before 2.2.0 for Perl serve a layout as a page when an equivalent spelling of its path misses the guard in the AutoPage handler",
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-93709",
    "datePublished": "2026-09-22T00:50:45.117Z",
    "dateReserved": "2026-09-18T15:05:23.319Z",
    "dateUpdated": "2026-09-22T02:09:44.163Z",
    "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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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-8FPV-59MJ-6JFR

CVE-2026-93709 (GCVE-0-2026-93709)

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