Vulnerability-Lookup

CVE-2026-2439 (GCVE-0-2026-2439)

Vulnerability from cvelistv5 – Published: 2026-02-16 21:25 – Updated: 2026-02-17 14:45

Title

Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids

Summary

Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids. The generate_session_id function in Concierge::Sessions::Base defaults to using the uuidgen command to generate a UUID, with a fallback to using Perl's built-in rand function. Neither of these methods are secure, and attackers are able to guess session_ids that can grant them access to systems. Specifically, * There is no warning when uuidgen fails. The software can be quietly using the fallback rand() function with no warnings if the command fails for any reason. * The uuidgen command will generate a time-based UUID if the system does not have a high-quality random number source, because the call does not explicitly specify the --random option. Note that the system time is shared in HTTP responses. * UUIDs are identifiers whose mere possession grants access, as per RFC 9562. * The output of the built-in rand() function is predictable and unsuitable for security applications.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-17 14:44 UTC

CWE

CWE-340 - Generation of Predictable Numbers or Identifiers
CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Assigner

CPANSec CNA under the redhat root

CNA scorecard C 64/100 over 265 records in the last 180 days details

References

5 references

URL	Tags
https://metacpan.org/release/BVA/Concierge-Sessio…	related
https://security.metacpan.org/docs/guides/random-…	related
https://www.rfc-editor.org/rfc/rfc9562.html#name-…	related
https://perldoc.perl.org/5.42.0/functions/rand	related
https://github.com/bwva/Concierge-Sessions/commit…	patch

Impacted products

1 product

Vendor	Product	Version	CPE status
BVA	Concierge::Sessions	Affected: 0.8.1 , < 0.8.5 (custom)	guessed

Credits

Robert Rothenberg

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-2439

Vulnerability from fkie_nvd - Published: 2026-02-16 22:22 - Updated: 2026-06-17 10:30

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/bwva/Concierge-Sessions/commit/20bb28e92e8fba307c4ff8264701c215be65e73b	Patch
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/BVA/Concierge-Sessions-v0.8.4/diff/BVA/Concierge-Sessions-v0.8.5#lib/Concierge/Sessions/Base.pm	Product, Release Notes
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://perldoc.perl.org/5.42.0/functions/rand	Third Party Advisory
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://security.metacpan.org/docs/guides/random-data-for-security.html	Third Party Advisory
9b29abf9-4ab0-4765-b253-1875cd9b441e	https://www.rfc-editor.org/rfc/rfc9562.html#name-security-considerations	Third Party Advisory

Impacted products

	Vendor	Product	Version
	bva	concierge\	\

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Concierge-Sessions",
          "product": "Concierge::Sessions",
          "programFiles": [
            "lib/Concierge/Sessions/Base.pm"
          ],
          "repo": "https://github.com/bwva/Concierge-Sessions",
          "vendor": "BVA",
          "versions": [
            {
              "lessThan": "0.8.5",
              "status": "affected",
              "version": "0.8.1",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:bva:concierge\\:\\:sessions:*:*:*:*:*:perl:*:*",
              "matchCriteriaId": "CDB9F71D-07E7-4EF3-8C7A-BF35F9175DB9",
              "versionEndExcluding": "0.8.5",
              "versionStartIncluding": "0.8.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids. The generate_session_id function in Concierge::Sessions::Base defaults to using the uuidgen command to generate a UUID, with a fallback to using Perl\u0027s built-in rand function. Neither of these methods are secure, and attackers are able to guess session_ids that can grant them access to systems. Specifically,\n\n  *  There is no warning when uuidgen fails. The software can be quietly using the fallback rand() function with no warnings if the command fails for any reason.\n  *  The uuidgen command will generate a time-based UUID if the system does not have a high-quality random number source, because the call does not explicitly specify the --random option. Note that the system time is shared in HTTP responses.\n  *  UUIDs are identifiers whose mere possession grants access, as per RFC 9562.\n  *  The output of the built-in rand() function is predictable and unsuitable for security applications."
    },
    {
      "lang": "es",
      "value": "Las versiones de Concierge::Sessions desde la 0.8.1 anteriores a la 0.8.5 para Perl generan identificadores de sesi\u00f3n inseguros. La funci\u00f3n generate_session_id en Concierge::Sessions::Base por defecto utiliza el comando uuidgen para generar un UUID, con un mecanismo de respaldo que usa la funci\u00f3n rand incorporada de Perl. Ninguno de estos m\u00e9todos es seguro, y los atacantes pueden adivinar los identificadores de sesi\u00f3n que pueden otorgarles acceso a los sistemas. Espec\u00edficamente,\n\n  * No hay ninguna advertencia cuando uuidgen falla. El software puede estar utilizando silenciosamente la funci\u00f3n de respaldo rand() sin advertencias si el comando falla por cualquier motivo.\n  * El comando uuidgen generar\u00e1 un UUID basado en el tiempo si el sistema no tiene una fuente de n\u00fameros aleatorios de alta calidad, porque la llamada no especifica expl\u00edcitamente la opci\u00f3n --random. Tenga en cuenta que la hora del sistema se comparte en las respuestas HTTP.\n  * Los UUID son identificadores cuya mera posesi\u00f3n otorga acceso, seg\u00fan la RFC 9562.\n  * La salida de la funci\u00f3n rand() incorporada es predecible e inadecuada para aplicaciones de seguridad."
    }
  ],
  "id": "CVE-2026-2439",
  "lastModified": "2026-06-17T10:30:57.400",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-2439",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-17T14:44:27.594037Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-16T22:22:41.470",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/bwva/Concierge-Sessions/commit/20bb28e92e8fba307c4ff8264701c215be65e73b"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://metacpan.org/release/BVA/Concierge-Sessions-v0.8.4/diff/BVA/Concierge-Sessions-v0.8.5#lib/Concierge/Sessions/Base.pm"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://perldoc.perl.org/5.42.0/functions/rand"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.rfc-editor.org/rfc/rfc9562.html#name-security-considerations"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-338"
        },
        {
          "lang": "en",
          "value": "CWE-340"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}

GHSA-9GWW-CR64-679C

Vulnerability from github – Published: 2026-02-17 00:30 – Updated: 2026-02-17 15:31

Details

There is no warning when uuidgen fails. The software can be quietly using the fallback rand() function with no warnings if the command fails for any reason.
The uuidgen command will generate a time-based UUID if the system does not have a high-quality random number source, because the call does not explicitly specify the --random option. Note that the system time is shared in HTTP responses.
UUIDs are identifiers whose mere possession grants access, as per RFC 9562.
The output of the built-in rand() function is predictable and unsuitable for security applications.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

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To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-2439"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-338"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-16T22:22:41Z",
    "severity": "CRITICAL"
  },
  "details": "Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids. The generate_session_id function in Concierge::Sessions::Base defaults to using the uuidgen command to generate a UUID, with a fallback to using Perl\u0027s built-in rand function. Neither of these methods are secure, and attackers are able to guess session_ids that can grant them access to systems. Specifically,\n\n  *  There is no warning when uuidgen fails. The software can be quietly using the fallback rand() function with no warnings if the command fails for any reason.\n  *  The uuidgen command will generate a time-based UUID if the system does not have a high-quality random number source, because the call does not explicitly specify the --random option. Note that the system time is shared in HTTP responses.\n  *  UUIDs are identifiers whose mere possession grants access, as per RFC 9562.\n  *  The output of the built-in rand() function is predictable and unsuitable for security applications.",
  "id": "GHSA-9gww-cr64-679c",
  "modified": "2026-02-17T15:31:35Z",
  "published": "2026-02-17T00:30:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2439"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bwva/Concierge-Sessions/commit/20bb28e92e8fba307c4ff8264701c215be65e73b"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/BVA/Concierge-Sessions-v0.8.4/diff/BVA/Concierge-Sessions-v0.8.5#lib/Concierge/Sessions/Base.pm"
    },
    {
      "type": "WEB",
      "url": "https://perldoc.perl.org/5.42.0/functions/rand"
    },
    {
      "type": "WEB",
      "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
    },
    {
      "type": "WEB",
      "url": "https://www.rfc-editor.org/rfc/rfc9562.html#name-security-considerations"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

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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.

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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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CVE-2026-2439 (GCVE-0-2026-2439)

FKIE_CVE-2026-2439

GHSA-9GWW-CR64-679C

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