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-2026-7874 (GCVE-0-2026-7874)
Vulnerability from cvelistv5 – Published: 2026-06-30 19:11 – Updated: 2026-07-02 03:55
VLAI
EPSS
VEX
Title
Weak Cryptographic Key Derivation Exposed All Stored Credentials
Summary
IBM Langflow OSS 1.0.0 through 1.10.0 Langflow could allow disclosure of all stored credentials due to the use of a weak and reversible key derivation mechanism for encryption at rest.
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
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7278447 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | Langflow OSS |
Affected:
1.0.0 , ≤ 1.10.0
(semver)
cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:langflow_oss:1.10.0:*:*:*:*:*:*:* |
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CVE-2026-7830 (GCVE-0-2026-7830)
Vulnerability from cvelistv5 – Published: 2026-07-01 03:33 – Updated: 2026-07-09 04:35
VLAI
EPSS
VEX
Title
UltraVNC MS-Logon II uses 64-bit Diffie-Hellman and seeded libc rand() enabling credential interception
Summary
UltraVNC through 1.8.2.2 uses inadequate cryptography in the MS-Logon II authentication scheme (rfbUltraVNC_MsLogonIIAuth). In rfb/dh.cpp the Diffie-Hellman key exchange is performed with parameters that fit in an unsigned 64-bit integer (DH_MAX_BITS controls the prime size). A 64-bit DH key can be broken by Pollard's rho algorithm in under one second on current hardware. Additionally, the private exponent is generated by the rng() function, which multiplies three libc rand() values seeded from time(NULL). With approximately 31 bits of internal state and a time-based seed, the private exponent is recoverable in under a minute by a passive observer. A network attacker who can observe the MS-Logon II handshake (via sniffing, recording, or man-in-the-middle) can derive the shared DH key and decrypt the encapsulated username and password, resulting in full credential disclosure. This affects legacy MS-Logon II connections; MS-Logon III (X25519 + AES-256-GCM) is unaffected.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://uvnc.com/ | vendor-advisory |
| https://github.com/ultravnc/UltraVNC | product |
| https://www.securin.io/zero-days/cve-2026-7830-31… |
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CVE-2026-6659 (GCVE-0-2026-6659)
Vulnerability from cvelistv5 – Published: 2026-05-08 17:17 – Updated: 2026-05-26 22:52
VLAI
EPSS
VEX
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)
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
5 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| RSAVAGE | Crypt::PasswdMD5 |
Affected:
0 , ≤ 1.42
(custom)
|
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CVE-2026-6146 (GCVE-0-2026-6146)
Vulnerability from cvelistv5 – Published: 2026-05-11 19:12 – Updated: 2026-05-13 13:00
VLAI
EPSS
VEX
Title
Amazon::Credentials versions through 1.2.0 for Perl uses rand to generate encryption keys
Summary
Amazon::Credentials versions through 1.2.0 for Perl uses rand to generate encryption keys.
Amazon::Credentials stores credentials in an obfuscated form to prevent access to the secrets from a data dump of the object.
Before version 1.3.0, the secrets were encrypted using a 64-bit key that was generated using the built-in rand function, which is predictable and unsuitable for cryptography.
Severity
5.3 (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
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| BIGFOOT | Amazon::Credentials |
Affected:
0 , ≤ 1.2.0
(custom)
|
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CVE-2026-5088 (GCVE-0-2026-5088)
Vulnerability from cvelistv5 – Published: 2026-04-15 07:03 – Updated: 2026-05-01 16:03
VLAI
EPSS
VEX
Title
Apache::API::Password versions through 0.5.2 for Perl can generate insecure random values for salts
Summary
Apache::API::Password versions through 0.5.2 for Perl can generate insecure random values for salts.
The _make_salt and _make_salt_bcrypt methods will attept to load Crypt::URandom and then Bytes::Random::Secure to generate random bytes for the salt. If those modules are unavailable, it will simply return 16 bytes generated with Perl's built-in rand function.
The rand function is unsuitable for cryptographic use.
These salts are used for password hashing.
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
Assigner
References
6 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| JDEGUEST | Apache::API::Password |
Affected:
0 , ≤ 0.5.2
(custom)
|
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CVE-2026-5087 (GCVE-0-2026-5087)
Vulnerability from cvelistv5 – Published: 2026-03-31 16:03 – Updated: 2026-04-01 14:43
VLAI
EPSS
VEX
Title
PAGI::Middleware::Session::Store::Cookie versions through 0.001003 for Perl generates random bytes insecurely
Summary
PAGI::Middleware::Session::Store::Cookie versions through 0.001003 for Perl generates random bytes insecurely.
PAGI::Middleware::Session::Store::Cookie attempts to read bytes from the /dev/urandom device directly. If that fails (for example, on systems without the device, such as Windows), then it will emit a warning that recommends the user install Crypt::URandom, and then return a string of random bytes generated by the built-in rand function, which is unsuitable for cryptographic applications.
This modules does not use the Crypt::URandom module, and installing it will not fix the problem.
The random bytes are used for generating an initialisation vector (IV) to encrypt the cookie.
A predictable IV may make it easier for malicious users to decrypt and tamper with the session data that is stored in the cookie.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| JJNAPIORK | PAGI::Middleware::Session::Store::Cookie |
Affected:
0 , ≤ 0.001003
(custom)
|
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CVE-2026-5085 (GCVE-0-2026-5085)
Vulnerability from cvelistv5 – Published: 2026-04-13 06:56 – Updated: 2026-04-13 15:30
VLAI
EPSS
VEX
Title
Solstice::Session versions through 1440 for Perl generates session ids insecurely
Summary
Solstice::Session versions through 1440 for Perl generates session ids insecurely.
The _generateSessionID method returns an MD5 digest seeded by the epoch time, a random hash reference, a call to the built-in rand() function and the process id.
The same method is used in the _generateID method in Solstice::Subsession, which is part of the same distribution.
The epoch time may be guessed, if it is not leaked in the HTTP Date header. Stringified hash refences will contain predictable content. The built-in rand() function is seeded by 16-bits and is unsuitable for security purposes. The process id comes from a small set of numbers.
Predictable session ids could allow an attacker to gain access to systems.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MCRAWFOR | Solstice::Session |
Affected:
0 , ≤ 1440
(custom)
|
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CVE-2026-5084 (GCVE-0-2026-5084)
Vulnerability from cvelistv5 – Published: 2026-05-11 06:37 – Updated: 2026-05-11 16:53
VLAI
EPSS
VEX
Title
WebDyne::Session versions through 2.075 for Perl generates the session id insecurely
Summary
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)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ASPEER | WebDyne::Session |
Affected:
0 , ≤ 2.075
(custom)
|
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CVE-2026-5083 (GCVE-0-2026-5083)
Vulnerability from cvelistv5 – Published: 2026-04-08 05:53 – Updated: 2026-04-08 17:24
VLAI
EPSS
VEX
Title
Ado::Sessions versions through 0.935 for Perl generates insecure session ids
Summary
Ado::Sessions versions through 0.935 for Perl generates insecure session ids.
The session id is generated from 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.
Predicable session ids could allow an attacker to gain access to systems.
Note that Ado is no longer maintained, and has been removed from the CPAN index. It is still available on BackPAN.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/kberov/Ado/issues/112 | issue-tracking |
| https://backpan.perl.org/authors/id/B/BE/BEROV/Ad… | |
| https://security.metacpan.org/docs/guides/random-… | technical-description |
| http://www.openwall.com/lists/oss-security/2026/04/08/7 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| BEROV | Ado::Sessions |
Affected:
0 , ≤ 0.935
(custom)
|
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CVE-2026-5082 (GCVE-0-2026-5082)
Vulnerability from cvelistv5 – Published: 2026-04-08 05:48 – Updated: 2026-04-08 16:09
VLAI
EPSS
VEX
Title
Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id
Summary
Amon2::Plugin::Web::CSRFDefender versions from 7.00 through 7.03 for Perl generate an insecure session id.
The generate_session_id function will attempt to read bytes from the /dev/urandom device, but if that is unavailable then it generates bytes using SHA-1 hash seeded with the built-in rand() function, the PID, and the high resolution epoch time. 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.
Amon2::Plugin::Web::CSRFDefender versions before 7.00 were part of Amon2, which was vulnerable to insecure session ids due to CVE-2025-15604.
Note that the author has deprecated this module.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://metacpan.org/release/TOKUHIROM/Amon2-Plug… | |
| https://metacpan.org/release/TOKUHIROM/Amon2-Plug… | release-notes |
| https://www.cve.org/CVERecord?id=CVE-2025-15604 | relatedvendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| TOKUHIROM | Amon2::Plugin::Web::CSRFDefender |
Affected:
7.00 , ≤ 7.03
(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.