CWE-338

Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong.

CVE-2026-6659 (GCVE-0-2026-6659)

Vulnerability from cvelistv5 – Published: 2026-05-08 17:17 – Updated: 2026-05-26 22:52
VLAI
Title
Crypt::PasswdMD5 versions through 1.42 for Perl generates insecure random values for salts
Summary
Crypt::PasswdMD5 versions through 1.42 for Perl generates insecure random values for salts. The built-in rand function is predictable, and unsuitable for cryptography.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
Impacted products
Vendor Product Version
RSAVAGE Crypt::PasswdMD5 Affected: 0 , ≤ 1.42 (custom)
Create a notification for this product.
Show details on NVD website
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CVE-2026-8503 (GCVE-0-2026-8503)

Vulnerability from cvelistv5 – Published: 2026-05-15 11:06 – Updated: 2026-05-15 15:37
VLAI
Title
Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids
Summary
Apache::Session::Generate::SHA256 versions before 1.3.19 for Perl create insecure session ids. Apache::Session::Generate::SHA256 generated session ids insecurely. The default session id generator returns a SHA-256 hash of the built-in rand() function, the epoch time, and the PID, that is hashed again. These are predictable, low-entropy sources. Predicable session ids could allow an attacker to gain access to systems. Note that version 1.3.19 has a fallback without warning to use insecure session generation method if the call to Crypt::URandom::urandom fails. However, this is unlikely as Crypt::URandom is a hardcoded requirement of the module. This issue is similar to CVE-2025-40931 for Apache::Session::Generate::MD5.
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 (v2.0.3)
CWE
  • CWE-340 - Generation of Predictable Numbers or Identifiers
  • CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator
Assigner
References
Impacted products
Vendor Product Version
GUIMARD Apache::Session::Generate::SHA256 Affected: 0 , < 1.3.19 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-8647 (GCVE-0-2026-8647)

Vulnerability from cvelistv5 – Published: 2026-05-26 22:53 – Updated: 2026-05-28 14:09
VLAI
Title
Crypt::ScryptKDF versions through 0.010 for Perl uses insecure random number source when no CSPRNG module is available
Summary
Crypt::ScryptKDF versions through 0.010 for Perl uses insecure random number source when no CSPRNG module is available. The random_bytes function fell back to using the built-in rand() function when none of the Perl modules Crypt::PRNG, Crypt::OpenSSL::Random, Net::SSLeay, Crypt::Random, or Bytes::Random::Secure were available.
Severity
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator
Assigner
References
Impacted products
Vendor Product Version
MIK Crypt::ScryptKDF Affected: 0 , ≤ 0.010 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-9638 (GCVE-0-2026-9638)

Vulnerability from cvelistv5 – Published: 2026-06-12 14:41 – Updated: 2026-06-12 17:50
VLAI
Title
Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts
Summary
Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts. These versions use the built-in rand function, which is predictable and unsuitable for cryptography.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
Impacted products
Vendor Product Version
ARODLAND Crypt::PBKDF2 Affected: 0 , < 0.261630 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/06/12/4"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Crypt-PBKDF2",
          "product": "Crypt::PBKDF2",
          "programRoutines": [
            {
              "name": "Crypt::PBKDF2::_random_salt"
            }
          ],
          "repo": "https://github.com/arodland/Crypt-PBKDF2",
          "vendor": "ARODLAND",
          "versions": [
            {
              "lessThan": "0.261630",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts.\n\nThese versions use the built-in rand function, which is predictable and unsuitable for cryptography."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-338",
              "description": "CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-12T14:41:51.921Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "url": "https://metacpan.org/dist/Crypt-PBKDF2/source/lib/Crypt/PBKDF2.pm#L86-93"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/ARODLAND/Crypt-PBKDF2-0.261630/changes"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to version 0.261630 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Crypt::PBKDF2 versions before 0.261630 for Perl generate insecure random values for salts",
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-9638",
    "datePublished": "2026-06-12T14:41:51.921Z",
    "dateReserved": "2026-05-26T18:28:03.845Z",
    "dateUpdated": "2026-06-12T17:50:43.544Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}
Mitigation

Phase: Implementation

Description:

  • Use functions or hardware which use a hardware-based random number generation for all crypto. This is the recommended solution. Use CyptGenRandom on Windows, or hw_rand() on Linux.

No CAPEC attack patterns related to this CWE.

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