High severity8.6OSV Advisory· Published Jul 14, 2026· Updated Jul 15, 2026
CVE-2026-45077
CVE-2026-45077
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 packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
symfony/monolog-bridgePackagist | < 5.4.52 | 5.4.52 |
symfony/symfonyPackagist | < 5.4.52 | 5.4.52 |
symfony/monolog-bridgePackagist | >= 6.0.0, < 6.4.40 | 6.4.40 |
symfony/monolog-bridgePackagist | >= 7.0.0, < 7.4.12 | 7.4.12 |
symfony/monolog-bridgePackagist | >= 8.0.0, < 8.0.12 | 8.0.12 |
symfony/symfonyPackagist | >= 6.0.0, < 6.4.40 | 6.4.40 |
symfony/symfonyPackagist | >= 7.0.0, < 7.4.12 | 7.4.12 |
symfony/symfonyPackagist | >= 8.0.0, < 8.0.12 | 8.0.12 |
Affected products
3v5.4.51, v8.0.11, v7.4.11, …+ 2 more
- (no CPE)range: v5.4.51, v8.0.11, v7.4.11, …
- cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*range: <5.4.52
- (no CPE)range: before 5.4.52, 6.4.40, 7.4.12, and 8.0.12
Patches
Vulnerability mechanics
References
10- github.com/symfony/symfony/commit/0891b2f293896c488e26943dc034334364b77fc4nvdPatchWEB
- github.com/symfony/symfony/security/advisories/GHSA-m7v2-7gxm-vc2vnvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-m7v2-7gxm-vc2vghsaADVISORY
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/monolog-bridge/CVE-2026-45077.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45077.yamlghsaWEB
- github.com/symfony/symfony/releases/tag/v5.4.52nvdProductRelease Notes
- github.com/symfony/symfony/releases/tag/v6.4.40nvdProductRelease Notes
- github.com/symfony/symfony/releases/tag/v7.4.12nvdProductRelease Notes
- github.com/symfony/symfony/releases/tag/v8.0.12nvdProductRelease Notes
- symfony.com/cve-2026-45077ghsaWEB
News mentions
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