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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.

PUBLISHED Reserved 2026-05-08 | Published 2026-07-14 | Updated 2026-07-14 | Assigner GitHub_M




HIGH: 8.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-502: Deserialization of Untrusted Data

CWE-668: Exposure of Resource to Wrong Sphere

Product status

< 5.4.52
affected

>= 6.0.0-BETA1, < 6.4.40
affected

>= 7.0.0-BETA1, < 7.4.12
affected

>= 8.0.0-BETA1, < 8.0.12
affected

< 5.4.52
affected

>= 6.0.0-BETA1, < 6.4.40
affected

>= 7.0.0-BETA1, < 7.4.12
affected

>= 8.0.0-BETA1, < 8.0.12
affected

References

github.com/...ymfony/security/advisories/GHSA-m7v2-7gxm-vc2v

github.com/...ommit/0891b2f293896c488e26943dc034334364b77fc4

github.com/symfony/symfony/releases/tag/v5.4.52

github.com/symfony/symfony/releases/tag/v6.4.40

github.com/symfony/symfony/releases/tag/v7.4.12

github.com/symfony/symfony/releases/tag/v8.0.12

cve.org (CVE-2026-45077)

nvd.nist.gov (CVE-2026-45077)

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