# CVE-2026-45077

## Summary

- **CVE ID:** CVE-2026-45077
- **Severity:** HIGH
- **CVSS Score:** 8.3 (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)
- **CWE:** CWE-502, CWE-668
- **Published:** Jul 14, 2026
- **Last Modified:** Jul 14, 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.

## Affected Products

- 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)
- 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)

## References

- [CNA](https://github.com/symfony/symfony/security/advisories/GHSA-m7v2-7gxm-vc2v)
- [CNA](https://github.com/symfony/symfony/commit/0891b2f293896c488e26943dc034334364b77fc4)
- [CNA](https://github.com/symfony/symfony/releases/tag/v5.4.52)
- [CNA](https://github.com/symfony/symfony/releases/tag/v6.4.40)
- [CNA](https://github.com/symfony/symfony/releases/tag/v7.4.12)
- [CNA](https://github.com/symfony/symfony/releases/tag/v8.0.12)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.67%
- **EPSS Percentile:** 49.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._