Common Weakness Enumeration
CWE-338
AllowedUse of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Abstraction: Base · Status: Draft
The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong.
323 vulnerabilities reference this CWE, most recent first.
CVE-2026-74887 (GCVE-0-2026-74887)
Vulnerability from cvelistv5 – Published: 2026-08-17 11:04 – Updated: 2026-08-17 11:04
VLAI
EPSS
VEX
Title
openssl_encrypt before 1.4.0 Insecure Random Import in PQC Module
Summary
openssl_encrypt before 1.4.0 imports Python's non-cryptographic 'random' module (Mersenne Twister PRNG) at line 15 of openssl_encrypt/modules/pqc.py. No direct calls to random.* were present in the code, so no cryptographic operation is currently affected; however, the import creates a hazard that future code could inadvertently use random.randint() instead of a cryptographically secure alternative (secrets/os.urandom), producing predictable values since the Mersenne Twister state can be recovered from approximately 624 outputs. Fixed by removing the import in 1.4.0.
Severity
CWE
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/jahlives/openssl_encrypt/secur… | vendor-advisory |
| https://www.vulncheck.com/advisories/openssl-encr… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| jahlives | openssl_encrypt |
Affected:
0 , < 1.4.0
(semver)
Unaffected: 1.4.0 (semver) |
Date Public
2026-02-10 00:00
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CVE-2026-74874 (GCVE-0-2026-74874)
Vulnerability from cvelistv5 – Published: 2026-08-17 11:04 – Updated: 2026-08-17 16:04
VLAI
EPSS
VEX
Title
openssl_encrypt before 1.4.0 Weak PRNG Steganography Pixel Selection
Summary
openssl_encrypt versions before 1.4.0 use Python's non-cryptographic random module for steganographic pixel selection in the generate_pseudorandom_sequence function. Attackers who know the password can recover the Mersenne Twister state from approximately 624 outputs and predict pixel locations containing hidden data for extraction.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 15:44 UTC
CWE
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/jahlives/openssl_encrypt/secur… | vendor-advisory |
| https://www.vulncheck.com/advisories/openssl-encr… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| jahlives | openssl_encrypt |
Affected:
0 , < 1.4.0
(semver)
Unaffected: 1.4.0 (semver) |
Date Public
2026-02-10 00:00
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CVE-2026-73567 (GCVE-0-2026-73567)
Vulnerability from cvelistv5 – Published: 2026-08-13 17:40 – Updated: 2026-08-14 18:09
VLAI
EPSS
VEX
Title
sm-crypto: Predictable SM2 key generation in Node.js: default RNG uses Math.random + wall clock
Summary
sm-crypto provides JavaScript implementations of the Chinese cryptographic algorithms SM2, SM3, and SM4. Prior to 0.5.0, the default no-argument sm2.generateKeyPairHex() path in Node.js uses the module-wide SecureRandom instance in src/sm2/utils.js, supplied by jsbn@1.1.0, which seeds an ARC4 stream from Math.random() and new Date().getTime() because window.crypto.getRandomValues is unavailable even though globalThis.crypto exists. An attacker who can observe the process's Math.random() outputs and estimate the key-generation time can reconstruct the seed, recover generated SM2 private keys, and predict signing ephemeral scalars used to forge signatures. This issue is fixed in version 0.5.0.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 17:55 UTC
CWE
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/JuneAndGreen/sm-crypto/securit… | x_refsource_CONFIRM |
| https://github.com/JuneAndGreen/sm-crypto/commit/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| JuneAndGreen | sm-crypto |
Affected:
< 0.5.0
|
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CVE-2026-71851 (GCVE-0-2026-71851)
Vulnerability from cvelistv5 – Published: 2026-08-07 18:48 – Updated: 2026-08-08 03:05
VLAI
EPSS
VEX
Title
crypto-js: Insufficient Entropy in Cryptographic Secret Generation via Vulnerable CryptoJS Dependency Chain
Summary
crypto-js is a JavaScript library of crypto standards. Versions of crypto-js prior to 4.0.0 generate randomness in CryptoJS.lib.WordArray.random() using a custom variation of the Multiply-With-Carry pseudorandom number generator, seeded from Math.random(), instead of a cryptographically secure source. This generator was introduced in version 3.1.2-4 and remained present in nearly every 3.x release. Nominal requests for 128 or 256 bits of entropy through this function produce effective search spaces of approximately 2 to the 39th and 2 to the 47th possibilities, small enough to enumerate on commodity hardware. Downstream wallet applications that used CryptoJS.lib.WordArray.random() as the entropy source for BIP39 recovery phrases are affected, and an attacker who enumerates the reduced output space can recover the resulting private keys and control the associated funds. This issue is fixed in version 4.0.0.
Severity
9 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-08 03:05 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/brix/crypto-js/security/adviso… | x_refsource_CONFIRM |
| https://github.com/brix/crypto-js/commit/b405ff59… | x_refsource_MISC |
| https://www.coinspect.com/blog/ill-bloom-investigation | x_refsource_MISC |
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CVE-2026-64798 (GCVE-0-2026-64798)
Vulnerability from cvelistv5 – Published: 2026-07-22 20:41 – Updated: 2026-07-28 05:33
VLAI
EPSS
VEX
Title
Joomla Extension - regularlabs.com - Insecure login URL keys in IP login extension
Summary
Joomla Extension - regularlabs.com - Insecure login URL keys in IP login extension - Persistent URL login keys were also generated using a non-cryptographic random generator with insufficient entropy.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 17:38 UTC
CWE
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://regularlabs.com/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| regularlabs.com | IP Login extension for Joomla |
Affected:
1.0.0-6.2.5
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CVE-2026-63089 (GCVE-0-2026-63089)
Vulnerability from cvelistv5 – Published: 2026-07-16 19:28 – Updated: 2026-07-18 03:08 X_Open Source
VLAI
EPSS
VEX
Title
WireGuard Easy Weak Token Generation Information Disclosure via OTL Route
Summary
WireGuard Easy through 15.3.0, fixed in commit 66b292b, contains a cryptographically weak one-time link token generation vulnerability that allows unauthenticated network attackers to recover WireGuard peer credentials by brute-forcing a keyspace of at most 1000 candidate tokens per client ID, as the token is computed using CRC32 over a random value constrained to 0-999. Attackers can enumerate candidate tokens against the unauthenticated /cnf/:oneTimeLink route, which lacks rate limiting and does not validate token expiration, to obtain a peer's PrivateKey and PresharedKey and impersonate that peer on the VPN network.
Severity
9.3 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-18 03:08 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/wg-easy/wg-easy/pull/2661 | issue-tracking |
| https://github.com/wg-easy/wg-easy/commit/66b292b… | patch |
| https://www.vulncheck.com/advisories/wireguard-ea… | third-party-advisory |
Impacted products
Date Public
2026-07-12 00:00
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CVE-2026-61500 (GCVE-0-2026-61500)
Vulnerability from cvelistv5 – Published: 2026-07-13 17:21 – Updated: 2026-07-15 14:14 X_Open Source
VLAI
EPSS
VEX
Title
Rejetto HFS < 3.2.1 Session Forgery via Predictable Signing Key
Summary
Rejetto HFS 3.0.0 through 3.2.0 derives its session-cookie signing key from the non-cryptographic Math.random() generator and discloses outputs of the same generator to unauthenticated clients during login. A remote attacker can collect a small number of login responses, reconstruct the generator's state, recover the signing key, and forge a valid administrator session cookie, leading to full administrative access and remote code execution via the server_code configuration feature.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 14:14 UTC
CWE
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/rejetto/hfs/releases/tag/v3.2.1 | release-notespatch |
| https://www.vulncheck.com/advisories/rejetto-hfs-… | third-party-advisory |
Date Public
2026-07-13 00:00
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CVE-2026-57082 (GCVE-0-2026-57082)
Vulnerability from cvelistv5 – Published: 2026-06-30 11:05 – Updated: 2026-07-20 06:43
VLAI
EPSS
VEX
Title
Net::BitTorrent versions before 2.1.0 for Perl generate the MSE Diffie-Hellman private key with a non-cryptographic PRNG
Summary
Net::BitTorrent versions before 2.1.0 for Perl generate the MSE Diffie-Hellman private key with a non-cryptographic PRNG.
The MSE (Message Stream Encryption) handshake derives its 160-bit Diffie-Hellman private key from Perl's rand(), a non-cryptographic drand48-class generator seeded once per process, in KeyExchange.pm. The shared secret and the RC4 keys derived from it (the SHA-1 of "keyA" or "keyB", the shared secret, and the infohash) therefore depend entirely on a predictable PRNG. The same handshake sends, in cleartext, random padding drawn from the same rand() sequence in _random_pad, immediately after the public key and the private-key draw.
A passive observer of the handshake recovers the PRNG state from the cleartext padding, reconstructs the private key, computes the shared secret from the peer's public key on the wire, derives the RC4 keys, and decrypts the connection, defeating the passive-observation obfuscation MSE provides.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-30 14:19 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sanko/Net-BitTorrent.pm/securi… | vendor-advisory |
| https://metacpan.org/release/SANKO/Net-BitTorrent… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SANKO | Net::BitTorrent |
Affected:
0 , < 2.1.0
(custom)
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CVE-2026-56016 (GCVE-0-2026-56016)
Vulnerability from cvelistv5 – Published: 2026-07-01 06:46 – Updated: 2026-07-01 17:36
VLAI
EPSS
VEX
Title
CGI::Session::ID::md5 versions before 4.49 for Perl generate predictable session ids from low-entropy sources
Summary
CGI::Session::ID::md5 versions before 4.49 for Perl generate predictable session ids from low-entropy sources.
The generate_id method builds the session id from a MD5 digest of the process id, the epoch time, and the built-in rand() function. All three are predictable, low-entropy sources: the PID is drawn from a small range, the epoch time can be guessed or read from the HTTP Date header, and Perl's rand() is unsuitable for security purposes because it is predictable and reversible.
An attacker who predicts a session id can impersonate the corresponding session and bypass authentication.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-01 14:03 UTC
CWE
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MARKSTOS | CGI::Session::ID::md5 |
Affected:
0 , < 4.49
(custom)
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CVE-2026-47372 (GCVE-0-2026-47372)
Vulnerability from cvelistv5 – Published: 2026-05-20 22:08 – Updated: 2026-05-21 14:12
VLAI
EPSS
VEX
Title
Crypt::SaltedHash versions through 0.09 for Perl generate insecure random values for salts
Summary
Crypt::SaltedHash versions through 0.09 for Perl generate insecure random values for salts.
These versions use the built-in rand function, which is predictable and unsuitable for cryptography.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-21 14:12 UTC
CWE
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| RRWO | Crypt::SaltedHash |
Affected:
0 , ≤ 0.09
(custom)
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Mitigation
Implementation
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.