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.
324 vulnerabilities reference this CWE, most recent first.
CVE-2026-16235 (GCVE-0-2026-16235)
Vulnerability from cvelistv5 – Published: 2026-07-20 07:02 – Updated: 2026-07-20 18:38
VLAI
EPSS
VEX
Title
Crypt::Password versions through 0.28 for Perl generate insecure random values for salts
Summary
Crypt::Password versions through 0.28 for Perl generate insecure random values for salts.
These versions use the built-in rand function, which is predictable and unsuitable for cryptography.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 13:08 UTC
CWE
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| DRSTEVE | Crypt::Password |
Affected:
0 , ≤ 0.28
(custom)
|
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CVE-2026-14495 (GCVE-0-2026-14495)
Vulnerability from cvelistv5 – Published: 2026-07-08 05:34 – Updated: 2026-07-08 12:44
VLAI
EPSS
VEX
Title
DoLogin Security <= 4.3 - Unauthenticated Authentication Bypass via Insufficient Randomness via 'dologin' Parameter Weak PRNG Token
Summary
The DoLogin Security plugin for WordPress is vulnerable to Authentication Bypass via Insufficient Randomness in all versions up to, and including, 4.3. The vulnerability exists because `dologin\s::rrand()` seeds the Mersenne Twister with `mt_srand((double) microtime() * 1000000)` — discarding the integer-seconds component of `microtime()` and constraining the seed to a range of approximately 10^6 values (~20 bits of entropy) — after which every character of the 32-character magic-link token is drawn sequentially with `mt_rand()`, making the entire token a deterministic function of that seed. Because `Pswdless::try_login()` is registered on the unauthenticated `init` hook, resolves the target account by the auto-increment numeric ID embedded in the `?dologin=<id>.<hash>` parameter, performs the hash comparison using a non-constant-time `!=` operator, and then calls `wp_set_auth_cookie()` directly — never passing through `wp_authenticate()` and therefore never triggering the plugin's own `Auth::_has_login_err()` lockout — an unauthenticated attacker can brute-force the ~10^6-candidate seed space to reconstruct an active passwordless login token and authenticate as any targeted user, including administrators, without a password. Exploitation requires that a valid, unexpired passwordless login link (active for up to 7 days) exists for the target account at the time of the attack, and that the numeric link ID is known or guessable from the auto-increment primary key.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 12:43 UTC
CWE
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| wpdo5ea | DoLogin Security |
Affected:
0 , ≤ 4.3
(semver)
|
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CVE-2026-13577 (GCVE-0-2026-13577)
Vulnerability from cvelistv5 – Published: 2026-07-20 07:11 – Updated: 2026-07-22 12:00
VLAI
EPSS
VEX
Title
Dancer2 versions through 2.1.0 for Perl generate insecure session ids when required CSPRNG modules are unavailable
Summary
Dancer2 versions through 2.1.0 for Perl generate insecure session ids when required CSPRNG modules are unavailable.
Dancer2::Core::Role::SessionFactory::generate_id silently falls back to a built-in rand-derived session id unless both Math::Random::ISAAC::XS and Crypt::URandom are available.
The fallback session id is generated from a SHA-1 hash of a call to the built-in rand function, the absolute path of the Dancer2::Core::Role::SessionFactory module, an internal counter, the process id, the module instance memory address, and a shuffled string of characters (using the List::Util::shuffle function, which also uses the built-in rand function).
These are all low-entropy and easily guessed sources.
The built-in rand() function is seeded with 32-bits and considered unsuitable for security applications.
Predictable session ids could allow an attacker to gain access to systems.
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 13:05 UTC
CWE
Assigner
References
2 references
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CVE-2026-13082 (GCVE-0-2026-13082)
Vulnerability from cvelistv5 – Published: 2026-07-17 12:54 – Updated: 2026-07-17 17:29
VLAI
EPSS
VEX
Title
GD::SecurityImage versions through 1.75 for Perl use rand to generate secrets
Summary
GD::SecurityImage versions through 1.75 for Perl use rand to generate secrets.
The random method creates the challenge text used for the CAPTCHA by sampling characters from an array using Perl's built-in rand function, and generates a (by default) six-character string.
The built-in rand function is unsuitable for security applications because it is predictable and reversible.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 17:29 UTC
CWE
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| BURAK | GD::SecurityImage |
Affected:
0 , ≤ 1.75
(custom)
|
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CVE-2026-11832 (GCVE-0-2026-11832)
Vulnerability from cvelistv5 – Published: 2026-06-15 21:19 – Updated: 2026-06-16 16:05
VLAI
EPSS
VEX
Title
Dancer2::Plugin::Auth::OAuth versions before 0.22 for Perl default to a predictable nonce
Summary
Dancer2::Plugin::Auth::OAuth versions before 0.22 for Perl default to a predictable nonce.
The default nonce was generated using an MD5 hash of the epoch time, which is predictable.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 16:04 UTC
CWE
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| BIAFRA | Dancer2::Plugin::Auth::OAuth |
Affected:
0 , < 0.22
(custom)
|
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CVE-2026-11347 (GCVE-0-2026-11347)
Vulnerability from cvelistv5 – Published: 2026-06-05 10:18 – Updated: 2026-06-05 20:22
VLAI
EPSS
VEX
Title
Hardcoded Cryptographic Keys and Weak IV Generation in linqi
Summary
The linqi application contains hardcoded cryptographic keys. Additionally, the application uses a weak algorithm with a limited ASCII charset to dynamically generate Initialization Vectors (IVs) for AES/CBC encryption, making known-plaintext attacks feasible. An attacker with local access can leverage these vulnerabilities to decrypt sensitive obfuscated strings, including ConnectionString values containing database credentials from appsettings.json.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-05 20:22 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://linqi.help/en/reference/security/security… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| linqi GmbH | linqi |
Affected:
0 , ≤ 1.4.8.5
(custom)
|
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CVE-2026-9733 (GCVE-0-2026-9733)
Vulnerability from cvelistv5 – Published: 2026-06-23 07:05 – Updated: 2026-06-23 14:18
VLAI
EPSS
VEX
Title
Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter
Summary
Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter.
When no state generator is specified in the constructor, the module defaults to using a SHA-1 hash of predictable and low-entropy sources, including the epoch time (which is leaked via the HTTP Date header) and a call to Perl's built-in rand function.
A predictable state allows an attacker to hijack another user's session through cross site request forgery (CSRF).
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-23 14:18 UTC
CWE
Assigner
References
4 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| HAYAJO | Mojolicious::Plugin::Web::Auth::OAuth2 |
Affected:
0 , ≤ 0.17
(custom)
|
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CVE-2026-9692 (GCVE-0-2026-9692)
Vulnerability from cvelistv5 – Published: 2026-06-18 17:53 – Updated: 2026-06-18 18:47
VLAI
EPSS
VEX
Title
Mojolicious::Sessions::Storable versions through 0.05 for Perl generate session ids insecurely
Summary
Mojolicious::Sessions::Storable versions through 0.05 for Perl generate session ids insecurely.
The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, the heap address of an anonymous hash, and the PID.
These are predictable or low-entropy sources that are unsuitable for security purposes.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-18 18:47 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://security.metacpan.org/patches/M/Mojolicio… | patch |
| https://metacpan.org/release/HAYAJO/Mojolicious-P… | |
| https://www.cve.org/CVERecord?id=CVE-2025-40923 | vendor-advisoryrelatedvdb-entry |
| https://security.metacpan.org/docs/guides/random-… | technical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| HAYAJO | Mojolicious::Sessions::Storable |
Affected:
0 , ≤ 0.05
(custom)
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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
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-12 17:49 UTC
CWE
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ARODLAND | Crypt::PBKDF2 |
Affected:
0 , < 0.261630
(custom)
|
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CVE-2026-9323 (GCVE-0-2026-9323)
Vulnerability from cvelistv5 – Published: 2026-07-18 13:51 – Updated: 2026-07-20 19:31
VLAI
EPSS
VEX
Title
Insecure PRNG and Information Exposure in urwid Web Display Backend
Summary
The urwid web display backend (urwid/display/web.py) generates web session identifiers (urwid_id) in Screen.start() by concatenating two random.randrange(10**9) calls that use Python's Mersenne Twister PRNG, which is not cryptographically secure. Each call consumes approximately 30 bits of PRNG state, and the Mersenne Twister internal state is approximately 19,937 bits, so an attacker who observes approximately 334 session IDs (for example via the X-Urwid-ID HTTP response header) can fully reconstruct the internal state and predict all past and future session IDs (Path B). The same identifier is also used as the filename of a FIFO created in the world-listable /tmp directory (for example /tmp/urwid375487765176907690.in), so any local user on the host can list /tmp to enumerate active session tokens directly (Path A). With a valid session ID, an attacker can read the victim's terminal screen via the polling endpoint, inject keystrokes into the victim's session (yielding OS-level code execution with the session owner's privileges if the session runs a shell), and inject exit sequences or flood the FIFO to terminate or crash the session. A prior Bandit S311 warning on this usage was suppressed with # noqa: S311 rather than fixed
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 19:26 UTC
CWE
- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/urwid/urwid/security/advisorie… | vendor-advisory |
| https://github.com/urwid/urwid | product |
| https://github.com/urwid/urwid/commit/24acd12f0d0… | patch |
| https://github.com/urwid/urwid/issues/1127 | issue-tracking |
| https://github.com/urwid/urwid/pull/1128 | issue-tracking |
| https://www.vulncheck.com/advisories/insecure-prn… | third-party-advisory |
Date Public
2026-07-18 00:00
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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.