CVE-2026-45077
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.
How to fix
- sensiolabs symfony5.4.52, 6.4.40, 7.4.12, 8.0.12 or later
- symfony/monolog-bridge5.4.52, 6.4.40, 7.4.12, 8.0.12 or later
- symfony/symfony5.4.52, 6.4.40, 7.4.12, 8.0.12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| sensiolabs symfony | v < 5.4.52, 6.0.0 ≤ v < 6.4.40, 7.0.0 ≤ v < 7.4.12, 8.0.0 ≤ v < 8.0.12 | 5.4.52, 6.4.40, 7.4.12, 8.0.12 |
| symfony/monolog-bridgePackagist | v < 5.4.52, 6.0.0 ≤ v < 6.4.40, 7.0.0 ≤ v < 7.4.12, 8.0.0 ≤ v < 8.0.12 | 5.4.52, 6.4.40, 7.4.12, 8.0.12 |
| symfony/symfonyPackagist | v < 5.4.52, 6.0.0 ≤ v < 6.4.40, 7.0.0 ≤ v < 7.4.12, 8.0.0 ≤ v < 8.0.12 | 5.4.52, 6.4.40, 7.4.12, 8.0.12 |
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