CVE-2026-45077
published 2026-07-14CVE-2026-45077: 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…
PriorityP355high8.6CVSS 3.1
AVNACLPRNUINSUCLILAH
EPSS
0.45%
36.3th percentile
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
20 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| sensiolabs | symfony | < 5.4.52 | 5.4.52 |
| sensiolabs | symfony | >= 6.0.0 < 6.4.40 | 6.4.40 |
| sensiolabs | symfony | >= 7.0.0 < 7.4.12 | 7.4.12 |
| sensiolabs | symfony | >= 8.0.0 < 8.0.12 | 8.0.12 |
| symfony | monolog-bridge | < 5.4.52 | 5.4.52 |
| symfony | monolog-bridge | — | — |
| symfony | monolog-bridge | — | — |
| symfony | monolog-bridge | — | — |
| symfony | monolog-bridge | >= 0 < 5.4.52 | 5.4.52 |
| symfony | monolog-bridge | >= 6.0.0 < 6.4.40 | 6.4.40 |
| symfony | monolog-bridge | >= 7.0.0 < 7.4.12 | 7.4.12 |
| symfony | monolog-bridge | >= 8.0.0 < 8.0.12 | 8.0.12 |
| symfony | symfony | < 5.4.52 | 5.4.52 |
| symfony | symfony | — | — |
| symfony | symfony | — | — |
| symfony | symfony | — | — |
| symfony | symfony | >= 0 < 5.4.52 | 5.4.52 |
| symfony | symfony | >= 6.0.0 < 6.4.40 | 6.4.40 |
| symfony | symfony | >= 7.0.0 < 7.4.12 | 7.4.12 |
| symfony | symfony | >= 8.0.0 < 8.0.12 | 8.0.12 |
CVSS provenance
nvdv3.18.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
nvdv4.08.3HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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VulDB
Symfony deserialization
vuldb·2026-05-28
CVE-2026-45077 [CRITICAL] Symfony deserialization
A vulnerability has been found in Symfony and classified as critical. This issue affects some unknown processing. The manipulation leads to deserialization.
This vulnerability is uniquely identified as CVE-2026-45077. The attack is possible to be carried out remotely. No exploit exists.
The affected component should be upgraded.
GHSA
Symfony has Unauthenticated PHP Object Deserialization in MonologBridge server:log Listener
ghsa·2026-05-27
CVE-2026-45077 [HIGH] CWE-502 Symfony has Unauthenticated PHP Object Deserialization in MonologBridge server:log Listener
Symfony has Unauthenticated PHP Object Deserialization in MonologBridge server:log Listener
### Description
`Symfony\Bridge\Monolog\Command\ServerLogCommand` (the `server:log` console command) is a development-time helper that opens a TCP listener and displays log records pushed to it by the application's logging pipeline. Two unsafe defaults combine into a remotely reachable PHP object-deserialization sink:
1. The listener binds to `0.0.0.0:9911` by default; it accepts connections on every interface, not only loopback.
2. Each received frame is processed as `unserialize(base64_decode($message))` without an `allowed_classes` allowlist, without authentication, and without any integrity check. The decoded value is then passed to `displayLog(..., array $record)` which assumes (without vali
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/symfony/symfony/commit/0891b2f293896c488e26943dc034334364b77fc4https://github.com/symfony/symfony/releases/tag/v5.4.52https://github.com/symfony/symfony/releases/tag/v6.4.40https://github.com/symfony/symfony/releases/tag/v7.4.12https://github.com/symfony/symfony/releases/tag/v8.0.12https://github.com/symfony/symfony/security/advisories/GHSA-m7v2-7gxm-vc2v
2026-07-14
Published