Vulnerability-Lookup

CVE-2026-5084 (GCVE-0-2026-5084)

Vulnerability from cvelistv5 – Published: 2026-05-11 06:37 – Updated: 2026-08-02 09:33

Title

WebDyne::Session versions before 3.003_704 for Perl generate the session id insecurely

Summary

WebDyne::Session versions before 3.003_704 for Perl generate the session id insecurely. The session handler generates the session id from an MD5 hash seeded with a call to the built-in rand() function. The rand function is passed a maximum value based on the process id, the epoch time and the reference address of the object, but this information will have no effect on the overall quality of the seed of the message digest. The rand function is seeded by 32-bits and is predictable. It is considered unsuitable for cryptographic purposes. Predictable session ids could allow an attacker to gain access to systems. Note that WebDyne::Session versions 1.042 and earlier appear to be in separate distributions from WebDyne.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-11 16:24 UTC

CWE

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

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/ASPEER/WebDyne-2.075…
https://github.com/aspeer/WebDyne/commit/7a3f949d…	patch
https://webdyne.org
https://security.metacpan.org/docs/guides/random-…	technical-description
http://www.openwall.com/lists/oss-security/2026/05/11/3

Impacted products

1 product

Vendor	Product	Version	CPE status
ASPEER	WebDyne::Session	Affected: 0 , < 3.003_704 (custom)	guessed

Show details on NVD website

JSON

To clipboard

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        ],
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FKIE_CVE-2026-5084

Vulnerability from fkie_nvd - Published: 2026-05-11 08:16 - Updated: 2026-08-02 10:16

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Summary

References

	URL	Tags
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/aspeer/WebDyne/commit/7a3f949dc24e62a276eb0db629db64aca356e954.patch
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://metacpan.org/release/ASPEER/WebDyne-2.075/source/lib/WebDyne/Session.pm#L120
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://security.metacpan.org/docs/guides/random-data-for-security.html
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://webdyne.org
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/05/11/3

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "WebDyne",
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          ],
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          "vendor": "ASPEER",
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    }
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    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://webdyne.org"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/11/3"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-338"
        },
        {
          "lang": "en",
          "value": "CWE-340"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}

GHSA-462C-H7QR-CXM6

Vulnerability from github – Published: 2026-05-11 09:30 – Updated: 2026-08-02 12:30

Details

WebDyne::Session versions through 2.075 for Perl generates the session id insecurely.

The session handler generates the session id from an MD5 hash seeded with a call to the built-in rand() function. The rand function is passed a maximum value based on the process id, the epoch time and the reference address of the object, but this information will have no effect on the overall quality of the seed of the message digest.

The rand function is seeded by 32-bits and is predictable. It is considered unsuitable for cryptographic purposes.

Predictable session ids could allow an attacker to gain access to systems.

Note that WebDyne::Session versions 1.042 and earlier appear to be in separate distributions from WebDyne.

Severity

6.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-5084"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-338"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-11T08:16:16Z",
    "severity": "MODERATE"
  },
  "details": "WebDyne::Session versions through 2.075 for Perl generates the session id insecurely.\n\nThe session handler generates the session id from an MD5 hash seeded with a call to the built-in rand() function. The rand function is passed a maximum value based on the process id, the epoch time and the reference address of the object, but this information will have no effect on the overall quality of the seed of the message digest.\n\nThe rand function is seeded by 32-bits and is predictable. It is considered unsuitable for cryptographic purposes.\n\nPredictable session ids could allow an attacker to gain access to systems.\n\nNote that WebDyne::Session versions 1.042 and earlier appear to be in separate distributions from WebDyne.",
  "id": "GHSA-462c-h7qr-cxm6",
  "modified": "2026-08-02T12:30:24Z",
  "published": "2026-05-11T09:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5084"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aspeer/WebDyne/commit/7a3f949dc24e62a276eb0db629db64aca356e954.patch"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/ASPEER/WebDyne-2.075/source/lib/WebDyne/Session.pm#L120"
    },
    {
      "type": "WEB",
      "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"
    },
    {
      "type": "WEB",
      "url": "https://webdyne.org"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/05/11/3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

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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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CVE-2026-5084 (GCVE-0-2026-5084)

FKIE_CVE-2026-5084

GHSA-462C-H7QR-CXM6

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