Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-45077

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 42.4%
CVSS Severity
CVSS v3 Score 8.6
Products affected by CVE-2026-45077


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