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CVE-2026-45077Symfony: Unauthenticated PHP Object Deserialization in MonologBridge server:log Listener

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.

8.3 HIGHEPSS 0.66%Not in KEVNVD: Analyzed

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
8.3HIGH4.0GitHub_M (CNA)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
8.6HIGH3.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Details

CVE ID
CVE-2026-45077
Status
Analyzed
Assigner (CNA)
GitHub_M
Published
Jul 14, 2026
Last modified
2026-07-15 15:35 UTC
Weaknesses
  • CWE-502 · Deserialization of Untrusted Data
  • CWE-668 · Exposure of Resource to Wrong Sphere

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-09 10:42 UTC.