CVE-2026-45077

HIGH

Symfony: Unauthenticated PHP Object Deserialization in MonologBridge server:log Listener

Title source: cna
STIX 2.1

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.

References (6)

Core 6

Scores

CVSS v3 8.6
EPSS 0.0045
EPSS Percentile 36.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-502 CWE-668
Status published
Products (9)
sensiolabs/symfony < 5.4.52
symfony/monolog-bridge < 5.4.52
symfony/monolog-bridge >= 6.0.0-BETA1, < 6.4.40
symfony/monolog-bridge >= 7.0.0-BETA1, < 7.4.12
symfony/monolog-bridge >= 8.0.0-BETA1, < 8.0.12
symfony/symfony < 5.4.52
symfony/symfony >= 6.0.0-BETA1, < 6.4.40
symfony/symfony >= 7.0.0-BETA1, < 7.4.12
symfony/symfony >= 8.0.0-BETA1, < 8.0.12
Published Jul 14, 2026
Tracked Since Jul 14, 2026