Symfony Cryptographic Vulnerability
The nextBytes function in the SecureRandom class in Symfony before 2.3.37, 2.6.x before 2.6.13, and 2.7.x before 2.7.9 does not properly generate random numbers when used with PHP 5.x without the paragonie/random_compat library and the openssl_random_pseudo_bytes function fails, which makes it easier for attackers to defeat cryptographic protection mechanisms via unspecified vectors.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | symfony/security | >= 2.3.0, < 2.3.37, >= 2.4.0, < 2.6.13, >= 2.7.0, < 2.7.9 | 2.3.37, 2.6.13, 2.7.9 |
| Composer package | symfony/security-core | >= 2.4.0, < 2.6.13, >= 2.7.0, < 2.7.9 | 2.6.13, 2.7.9 |
| Composer package | symfony/symfony | >= 2.3.0, < 2.3.37, >= 2.4.0, < 2.6.13, >= 2.7.0, < 2.7.9 | 2.3.37, 2.6.13, 2.7.9 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2016-1902
- https://github.com/symfony/symfony/pull/17359
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-core/CVE-2016-1902.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security/CVE-2016-1902.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2016-1902.yaml
- https://symfony.com/cve-2016-1902
- https://www.landaire.net/blog/cve-2016-1902-symfony-securerandom
- http://symfony.com/blog/cve-2016-1902-securerandom-s-fallback-not-secure-when-openssl-fails
- http://www.debian.org/security/2016/dsa-3588
- CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-332- Platform
- Composer
- Package
symfony/security, symfony/security-core, symfony/symfony- Disclosed
- 17.05.2022
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-jjx5-fq5g-8xpc - CC BY 4.0
Vulnerability history: symfony/security-core
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 5
- First → latest
- 05.2021 05.2022
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 1
- Medium 1
Disclosures per year
- 2021: 1
- 2022: 4
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
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Symfony Cryptographic Vulnerability this entry
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