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-2026-5085 (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 · CISA-ADP (v2.0.3)
Decision recorded 2026-04-13 14:27 UTC
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: 2026-08-02 09:33
VLAI
EPSS
VEX
Title
WebDyne::Session versions before 3.003_704 for Perl generate the session id insecurely
Summary
WebDyne::Session versions before 3.003_704 for Perl generate 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 · CISA-ADP (v2.0.3)
Decision recorded 2026-05-11 16:24 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ASPEER | WebDyne::Session |
Affected:
0 , < 3.003_704
(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 · CISA-ADP (v2.0.3)
Decision recorded 2026-04-08 16:08 UTC
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-04-08 16:09 UTC
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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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 · CISA-ADP (v2.0.3)
Decision recorded 2026-04-30 13:24 UTC
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-04-01 14:14 UTC
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-03-03 20:23 UTC
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-02-17 14:44 UTC
CWE
Assigner
References
5 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| BVA | Concierge::Sessions |
Affected:
0.8.1 , < 0.8.5
(custom)
|
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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 · CISA-ADP (v2.0.3)
Decision recorded 2025-12-30 13:57 UTC
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 · CISA-ADP (v2.0.3)
Decision recorded 2025-12-29 16:44 UTC
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 |
| https://github.com/FreshRSS/FreshRSS/commit/57e1a… | x_refsource_MISC |
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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.