Vulnerability-Lookup

GHSA-2P7F-7XJF-8Q9Q

Vulnerability from github – Published: 2026-02-27 21:31 – Updated: 2026-02-27 21:31

Details

HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function.

The HTTP::Session2 session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand() function is unsuitable for cryptographic usage.

HTTP::Session2 after version 1.02 will attempt to use the /dev/urandom device to generate a session id, but if the device is unavailable (for example, under Windows), then it will revert to the insecure method described above.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-3255"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-338"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-27T20:21:41Z",
    "severity": null
  },
  "details": "HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function.\n\nThe HTTP::Session2 session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand() function is unsuitable for cryptographic usage.\n\nHTTP::Session2 after version 1.02 will attempt to use the /dev/urandom device to generate a session id, but if the device is unavailable (for example, under Windows), then it will revert to the insecure method described above.",
  "id": "GHSA-2p7f-7xjf-8q9q",
  "modified": "2026-02-27T21:31:22Z",
  "published": "2026-02-27T21:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3255"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tokuhirom/HTTP-Session2/commit/9cfde4d7e0965172aef5dcfa3b03bb48df93e636.patch"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.01/source/lib/HTTP/Session2/ServerStore.pm#L68"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.11/source/lib/HTTP/Session2/Random.pm#L35"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.12/changes"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-3255 (GCVE-0-2026-3255)

Vulnerability from cvelistv5 – Published: 2026-02-27 20:12 – Updated: 2026-02-28 00:15

Title

HTTP::Session2 versions before 1.12 for Perl may generate weak session ids using the rand() function

Summary

HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function. The HTTP::Session2 session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand() function is unsuitable for cryptographic usage. HTTP::Session2 after version 1.02 will attempt to use the /dev/urandom device to generate a session id, but if the device is unavailable (for example, under Windows), then it will revert to the insecure method described above.

Severity ?

No CVSS data available.

CWE

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

Assigner

CPANSec

References

URL

Tags

	https://metacpan.org/release/TOKUHIROM/HTTP-Sessi…
	https://metacpan.org/release/TOKUHIROM/HTTP-Sessi…
	https://metacpan.org/release/TOKUHIROM/HTTP-Sessi…	release-notes
	https://github.com/tokuhirom/HTTP-Session2/commit…	patch

Impacted products

	Vendor	Product	Version
	TOKUHIROM	HTTP::Session2	Affected: 0 , < 1.12 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-02-28T00:15:39.689Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/02/27/12"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "HTTP-Session2",
          "product": "HTTP::Session2",
          "repo": "https://github.com/tokuhirom/HTTP-Session2",
          "vendor": "TOKUHIROM",
          "versions": [
            {
              "lessThan": "1.12",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function.\n\nThe HTTP::Session2 session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, and the PID. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand() function is unsuitable for cryptographic usage.\n\nHTTP::Session2 after version 1.02 will attempt to use the /dev/urandom device to generate a session id, but if the device is unavailable (for example, under Windows), then it will revert to the insecure method described above."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-115",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-115 Authentication Bypass"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-340",
              "description": "CWE-340 Generation of Predictable Numbers or Identifiers",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-338",
              "description": "CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-27T20:12:35.414Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "url": "https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.11/source/lib/HTTP/Session2/Random.pm#L35"
        },
        {
          "url": "https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.01/source/lib/HTTP/Session2/ServerStore.pm#L68"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/TOKUHIROM/HTTP-Session2-1.12/changes"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/tokuhirom/HTTP-Session2/commit/9cfde4d7e0965172aef5dcfa3b03bb48df93e636.patch"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "HTTP::Session2 has been deprecated since version 1.11. Migrate to a different solution."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2014-07-31T00:00:00.000Z",
          "value": "version 1.02 HTTP::Session2 released that attempts to use /dev/urandom."
        },
        {
          "lang": "en",
          "time": "2026-02-24T00:00:00.000Z",
          "value": "version 1.11 HTTP::Session2 deprecated"
        },
        {
          "lang": "en",
          "time": "2026-02-26T00:00:00.000Z",
          "value": "version 1.12 HTTP::Session2 released with a fix with a portable solution."
        }
      ],
      "title": "HTTP::Session2 versions before 1.12 for Perl may generate weak session ids using the rand() function",
      "workarounds": [
        {
          "lang": "en",
          "value": "Upgrade to version 1.12 or later."
        }
      ],
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-3255",
    "datePublished": "2026-02-27T20:12:35.414Z",
    "dateReserved": "2026-02-26T11:43:17.278Z",
    "dateUpdated": "2026-02-28T00:15:39.689Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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-2P7F-7XJF-8Q9Q

CVE-2026-3255 (GCVE-0-2026-3255)

Tags

Sightings

Nomenclature