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-2026-5080 (GCVE-0-2026-5080)
Vulnerability from cvelistv5 – Published: 2026-04-30 11:49 – Updated: 2026-04-30 18:29
VLAI
EPSS
VEX
Title
Dancer::Session::Abstract versions through 1.3522 for Perl generates session ids insecurely
Summary
Dancer::Session::Abstract versions through 1.3522 for Perl generates session ids insecurely.
The session id is generated from summing the character codepoints of the absolute pathname with the process id, the epoch time and calls to the built-in rand() function to return a number between 0 and 999-billion, and concatenating that result three times.
The path name might be known or guessed by an attacker, especially for applications known to be written using Dancer with standard installation locations.
The epoch time can be guessed by an attacker, and may be leaked in the HTTP header.
The process id comes from a small set of numbers, and workers may have sequential process ids.
The built-in rand() function is seeded with 32-bits and is considered unsuitable for security applications.
Predictable session ids could allow an attacker to gain access to systems.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| BIGPRESH | Dancer::Session::Abstract |
Affected:
0 , ≤ 1.3522
(custom)
|
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CVE-2026-3256 (GCVE-0-2026-3256)
Vulnerability from cvelistv5 – Published: 2026-03-28 18:52 – Updated: 2026-06-29 06:50
VLAI
EPSS
VEX
Title
HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids
Summary
HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids.
HTTP::Session defaults to using HTTP::Session::ID::SHA1 to generate session ids using a SHA-1 hash seeded with the built-in rand function, the high resolution 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.
The distribution includes HTTP::session::ID::MD5 which contains a similar flaw, but uses the MD5 hash instead.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
5 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| KTAT | HTTP::Session |
Affected:
0 , < 0.54
(custom)
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CVE-2026-3255 (GCVE-0-2026-3255)
Vulnerability from cvelistv5 – Published: 2026-02-27 20:12 – Updated: 2026-03-03 20:23
VLAI
EPSS
VEX
Title
HTTP::Session2 versions before 1.12 for Perl may generate weak session ids using the rand() function
Summary
HTTP::Session2 versions before 1.12 for Perl for Perl may generate weak session ids using the rand() function.
The HTTP::Session2 session id generator returns 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.
HTTP::Session2 after version 1.02 will attempt to use the /dev/urandom device to generate a session id, but if the device is unavailable (for example, under Windows), then it will revert to the insecure method described above.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| TOKUHIROM | HTTP::Session2 |
Affected:
0 , < 1.12
(custom)
|
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CVE-2026-2439 (GCVE-0-2026-2439)
Vulnerability from cvelistv5 – Published: 2026-02-16 21:25 – Updated: 2026-02-17 14:45
VLAI
EPSS
VEX
Title
Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids
Summary
Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids. The generate_session_id function in Concierge::Sessions::Base defaults to using the uuidgen command to generate a UUID, with a fallback to using Perl's built-in rand function. Neither of these methods are secure, and attackers are able to guess session_ids that can grant them access to systems. Specifically,
* There is no warning when uuidgen fails. The software can be quietly using the fallback rand() function with no warnings if the command fails for any reason.
* The uuidgen command will generate a time-based UUID if the system does not have a high-quality random number source, because the call does not explicitly specify the --random option. Note that the system time is shared in HTTP responses.
* UUIDs are identifiers whose mere possession grants access, as per RFC 9562.
* The output of the built-in rand() function is predictable and unsuitable for security applications.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
5 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| BVA | Concierge::Sessions |
Affected:
0.8.1 , < 0.8.5
(custom)
|
Credits
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CVE-2025-69217 (GCVE-0-2025-69217)
Vulnerability from cvelistv5 – Published: 2025-12-30 00:41 – Updated: 2025-12-30 15:57
VLAI
EPSS
VEX
Title
Coturn has unsafe nonce and relay port randomization due to weak random number generation.
Summary
coturn is a free open source implementation of TURN and STUN Server. Versions 4.6.2r5 through 4.7.0-r4 have a bad random number generator for nonces and port randomization after refactoring. Additionally, random numbers aren't generated with openssl's RAND_bytes but libc's random() (if it's not running on Windows). When fetching about 50 sequential nonces (i.e., through sending 50 unauthenticated allocations requests) it is possible to completely reconstruct the current state of the random number generator, thereby predicting the next nonce. This allows authentication while spoofing IPs. An attacker can send authenticated messages without ever receiving the responses, including the nonce (requires knowledge of the credentials, which is e.g., often the case in IoT settings). Since the port randomization is deterministic given the pseudorandom seed, an attacker can exactly reconstruct the ports and, hence predict the randomization of the ports. If an attacker allocates a relay port, they know the current port, and they are able to predict the next relay port (at least if it is not used before). Commit 11fc465f4bba70bb0ad8aae17d6c4a63a29917d9 contains a fix.
Severity
7.7 (High)
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://github.com/coturn/coturn/security/advisor… | x_refsource_CONFIRM |
| https://github.com/coturn/coturn/commit/11fc465f4… | x_refsource_MISC |
| https://github.com/coturn/coturn/commit/88ced4713… | x_refsource_MISC |
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CVE-2025-68932 (GCVE-0-2025-68932)
Vulnerability from cvelistv5 – Published: 2025-12-26 23:43 – Updated: 2025-12-29 16:51
VLAI
EPSS
VEX
Title
FreshRSS has weak cryptographic randomness in remember-me token and nonce generation
Summary
FreshRSS is a free, self-hostable RSS aggregator. Prior to version 1.28.0, FreshRSS uses cryptographically weak random number generators (mt_rand() and uniqid()) to generate remember-me authentication tokens and challenge-response nonces. This allows attackers to predict valid session tokens, leading to account takeover through persistent session hijacking. The remember-me tokens provide permanent authentication and are the sole credential for "keep me logged in" functionality. This issue has been patched in version 1.28.0.
Severity
SSVC
Exploitation: poc
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://github.com/FreshRSS/FreshRSS/security/adv… | x_refsource_CONFIRM |
| https://github.com/FreshRSS/FreshRSS/pull/8061 | x_refsource_MISC |
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CVE-2025-67504 (GCVE-0-2025-67504)
Vulnerability from cvelistv5 – Published: 2025-12-09 03:31 – Updated: 2025-12-09 15:10
VLAI
EPSS
VEX
Title
WBCE CMS has Weak Random Number Generator in Password Generation Function
Summary
WBCE CMS is a content management system. Versions 1.6.4 and below use function GenerateRandomPassword() to create passwords using PHP's rand(). rand() is not cryptographically secure, which allows password sequences to be predicted or brute-forced. This can lead to user account compromise or privilege escalation if these passwords are used for new accounts or password resets. The vulnerability is fixed in version 1.6.5.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/WBCE/WBCE_CMS/security/advisor… | x_refsource_CONFIRM |
| https://github.com/WBCE/WBCE_CMS/commit/5d59fe021… | x_refsource_MISC |
| https://cwe.mitre.org/data/definitions/338.html | x_refsource_MISC |
| https://github.com/WBCE/WBCE_CMS/releases/tag/1.6.5 | x_refsource_MISC |
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CVE-2025-66630 (GCVE-0-2025-66630)
Vulnerability from cvelistv5 – Published: 2026-02-09 18:04 – Updated: 2026-02-10 16:02
VLAI
EPSS
VEX
Title
Fiber insecurely fallsback in utils.UUIDv4() / utils.UUID() — predictable / zero‑UUID on crypto/rand failure
Summary
Fiber is an Express inspired web framework written in Go. Before 2.52.11, on Go versions prior to 1.24, the underlying crypto/rand implementation can return an error if secure randomness cannot be obtained. Because no error is returned by the Fiber v2 UUID functions, application code may unknowingly rely on predictable, repeated, or low-entropy identifiers in security-critical pathways. This is especially impactful because many Fiber v2 middleware components (session middleware, CSRF, rate limiting, request-ID generation, etc.) default to using utils.UUIDv4(). This vulnerability is fixed in 2.52.11.
Severity
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://github.com/gofiber/fiber/security/advisor… | x_refsource_CONFIRM |
| https://github.com/gofiber/fiber/commit/eb874b6f6… | x_refsource_MISC |
| https://github.com/gofiber/fiber/releases/tag/v2.52.11 | x_refsource_MISC |
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CVE-2025-66565 (GCVE-0-2025-66565)
Vulnerability from cvelistv5 – Published: 2025-12-09 01:47 – Updated: 2025-12-09 16:03
VLAI
EPSS
VEX
Title
Fiber Utils UUIDv4 and UUID Silent Fallback to Predictable Values
Summary
Fiber Utils is a collection of common functions created for Fiber. In versions 2.0.0-rc.3 and below, when the system's cryptographic random number generator (crypto/rand) fails, both functions silently fall back to returning predictable UUID values, including the zero UUID "00000000-0000-0000-0000-000000000000". The vulnerability occurs through two related but distinct failure paths, both ultimately caused by crypto/rand.Read() failures, compromising the security of all Fiber applications using these functions for security-critical operations. This issue is fixed in version 2.0.0-rc.4.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/gofiber/utils/security/advisor… | x_refsource_CONFIRM |
| https://github.com/gofiber/utils/commit/6c6cf0470… | x_refsource_MISC |
Impacted products
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CVE-2025-59390 (GCVE-0-2025-59390)
Vulnerability from cvelistv5 – Published: 2025-11-26 08:50 – Updated: 2025-12-11 14:24
VLAI
EPSS
VEX
Title
Apache Druid: Kerberos authenticaton chooses a cryptographically unsecure secret if not configured explicitly.
Summary
Apache Druid’s Kerberos authenticator uses a weak fallback secret when the `druid.auth.authenticator.kerberos.cookieSignatureSecret` configuration is not explicitly set. In this case, the secret is generated using `ThreadLocalRandom`,
which is not a crypto-graphically secure random number generator. This
may allow an attacker to predict or brute force the secret used to sign
authentication cookies, potentially enabling token forgery or
authentication bypass. Additionally, each process generates its own
fallback secret, resulting in inconsistent secrets across nodes. This
causes authentication failures in distributed or multi-broker
deployments, effectively leading to a incorrectly configured clusters. Users are
advised to configure a strong `druid.auth.authenticator.kerberos.cookieSignatureSecret`
This issue affects Apache Druid: through 34.0.0.
Users are recommended to upgrade to version 35.0.0, which fixes the issue making it mandatory to set `druid.auth.authenticator.kerberos.cookieSignatureSecret` when using the Kerberos authenticator. Services will fail to come up if the secret is not set.
Severity
9.8 (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
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Druid |
Affected:
0 , ≤ 34.0.0
(semver)
|
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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.