CVE-2026-45077
Symfony: Unauthenticated PHP Object Deserialization in MonologBridge server:log Listener
- State
- Published
- Severity
- 8.3 High
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Reserved
- May 8, 2026
Description
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, the server:log listener (Symfony\Bridge\Monolog\Command\ServerLogCommand) binds to 0.0.0.0:9911 by default and processes each received frame with unserialize(base64_decode($message)) without authentication, integrity checks, or an allowed_classes allowlist, allowing any reachable host to submit attacker-chosen serialized PHP payloads that can crash the listener and may trigger object-injection gadget effects. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.3 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
symfonysymfony |
|
monolog-bridgesymfony |
|
References
- https://github.com/symfony/symfony/security/advisories/GHSA-m7v2-7gxm-vc2v
- https://github.com/symfony/symfony/commit/0891b2f293896c488e26943dc034334364b77fc4
- https://github.com/symfony/symfony/releases/tag/v5.4.52
- https://github.com/symfony/symfony/releases/tag/v6.4.40
- https://github.com/symfony/symfony/releases/tag/v7.4.12
- https://github.com/symfony/symfony/releases/tag/v8.0.12
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