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.
293 vulnerabilities reference this CWE, most recent first.
CVE-2026-61500 (GCVE-0-2026-61500)
Vulnerability from cvelistv5 – Published: 2026-07-13 17:21 – Updated: 2026-07-14 22:03 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)
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
Credits
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CVE-2026-57082 (GCVE-0-2026-57082)
Vulnerability from cvelistv5 – Published: 2026-06-30 11:05 – Updated: 2026-06-30 14:20
VLAI
EPSS
VEX
Title
Net::BitTorrent versions through 2.0.1 for Perl generate the MSE Diffie-Hellman private key with a non-cryptographic PRNG
Summary
Net::BitTorrent versions through 2.0.1 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 (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sanko/Net-BitTorrent.pm/securi… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SANKO | Net::BitTorrent |
Affected:
0 , ≤ 2.0.1
(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 (v2.0.3)
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 (v2.0.3)
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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CVE-2026-46493 (GCVE-0-2026-46493)
Vulnerability from cvelistv5 – Published: 2026-06-05 19:19 – Updated: 2026-06-05 19:42
VLAI
EPSS
VEX
Title
haxtheweb/haxcms-php uses insecure method for generating salt
Summary
HAX CMS helps manage microsite universe with PHP or NodeJs backends. Versions prior to 26.0.1 use `uniqid` for generating salts, which is unsuitable. Version 26.0.1 fixes the issue.
Severity
7.5 (High)
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
3 references
| URL | Tags |
|---|---|
| https://github.com/haxtheweb/issues/security/advi… | x_refsource_CONFIRM |
| https://github.com/haxtheweb/haxcms-php/commit/4b… | x_refsource_MISC |
| https://github.com/haxtheweb/haxcms-php/blob/8b88… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| haxtheweb | haxcms-php |
Affected:
< 26.0.1
|
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CVE-2026-44040 (GCVE-0-2026-44040)
Vulnerability from cvelistv5 – Published: 2026-07-01 03:33 – Updated: 2026-07-09 04:36
VLAI
EPSS
VEX
Title
UltraVNC vncauth.c uses time-seeded libc rand() to generate VNC authentication challenge bytes
Summary
UltraVNC through 1.8.2.2 uses a cryptographically weak pseudo-random number generator to produce VNC authentication challenge bytes. In rfb/vncauth.c:119-129, the vncRandomBytes() function seeds libc rand() with time(0) + getpid() + rand() and generates a 16-byte challenge. The combined seed space is approximately 31 bits (libc rand() internal state) and is entirely determined by publicly-observable values (wall-clock time and process ID). An attacker who can observe the authentication exchange can enumerate the seed space and predict the challenge within seconds, enabling forgery or offline brute-forcing of responses. Note: on Windows, the active code path may use vncEncryptBytes2.cpp which calls CryptGenRandom; reachability on shipped Windows binaries requires compile-graph verification and is under investigation.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://uvnc.com/ | vendor-advisory |
| https://github.com/ultravnc/UltraVNC | product |
| https://www.securin.io/zero-days/cve-2026-44040-l… |
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CVE-2026-42155 (GCVE-0-2026-42155)
Vulnerability from cvelistv5 – Published: 2026-05-15 17:05 – Updated: 2026-05-15 17:36
VLAI
EPSS
VEX
Title
Magento LTS: Weak API Session ID — Predictable MD5 of Time-Derived Inputs
Summary
Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Magento Community Edition e-commerce platform with a high level of backward compatibility. Prior to 20.18.0, the XML-RPC / SOAP API session ID is generated using an outdated, time-based construction rather than a Cryptographically Secure Pseudo-Random Number Generator (CSPRNG). All inputs to the MD5 hash are time-derived and non-secure. Because the resulting digest relies entirely on the timestamp and the PHP internal LCG state, the effective entropy is severely constrained. This violates the OWASP ASVS v4 requirement of ≥ 64 bits of entropy (V3.2.2) and NIST SP 800-63B standards. By narrowing the LCG window (via server state leaks or general predictability) and leveraging the lack of API rate-limiting, an attacker can generate a localized pool of candidate MD5 hashes and execute a high-speed online brute-force attack to hijack active API sessions. This vulnerability is fixed in 20.18.0.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/OpenMage/magento-lts/security/… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OpenMage | magento-lts |
Affected:
< 20.18.0
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CVE-2026-41858 (GCVE-0-2026-41858)
Vulnerability from cvelistv5 – Published: 2026-06-04 02:10 – Updated: 2026-06-04 15:07
VLAI
EPSS
VEX
Summary
Weak Randomness / Insecure Cryptographic Primitive (CWE-338) in Get-RandomPassword in BOSH-Ecosystem / windows-utilities-release allows a network attacker to estimate VM boot time and reconstruct a small candidate list to recover the Administrator password. The randomize_password job exists solely to lock the local Administrator account behind an unguessable password as a hardening control. Because the password is derived from a predictable, clock-seeded PRNG, a network attacker who can estimate VM boot time can reconstruct a small candidate list and recover the Administrator password, defeating the hardening control.
Affected versions:
- windows-utilities-release: all versions prior to v0.23.0 (inclusive); fixed in v0.23.0 or later
Severity
6.5 (Medium)
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
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cloud Foundry Foundation | windows-utilities-release |
Affected:
0 , < 0.23.0
(custom)
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CVE-2026-41564 (GCVE-0-2026-41564)
Vulnerability from cvelistv5 – Published: 2026-04-23 07:29 – Updated: 2026-04-23 13:05
VLAI
EPSS
VEX
Title
CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking
Summary
CryptX versions before 0.088 for Perl do not reseed the Crypt::PK PRNG state after forking.
The Crypt::PK::RSA, Crypt::PK::DSA, Crypt::PK::DH, Crypt::PK::ECC, Crypt::PK::Ed25519 and Crypt::PK::X25519 modules seed a per-object PRNG state in their constructors and reuse it without fork detection. A Crypt::PK::* object created before `fork()` shares byte-identical PRNG state with every child process, and any randomized operation they perform can produce identical output, including key generation. Two ECDSA or DSA signatures from different processes are enough to recover the signing private key through nonce-reuse key recovery.
This affects preforking services such as the Starman web server, where a Crypt::PK::* object loaded at startup is inherited by every worker process.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
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CVE-2026-41505 (GCVE-0-2026-41505)
Vulnerability from cvelistv5 – Published: 2026-05-07 13:35 – Updated: 2026-05-07 14:44
VLAI
EPSS
VEX
Title
RELATE: Predictable Token Generation in auth.py and exam.py
Summary
RELATE is a web-based courseware package. Prior to commit 2f68e16, RELATE is vulnerable to predictable token generation in auth.py's make_sign_in_key() function and exam.py's gen_ticket_code() function. This issue has been patched via commit 2f68e16.
Severity
8.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/inducer/relate/security/adviso… | x_refsource_CONFIRM |
| https://github.com/inducer/relate/commit/2f68e16c… | x_refsource_MISC |
Impacted products
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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.