Adminer PHP Object Injection issue leads to Denial of Service
Adminer 4.8.1, when using Monolog for logging, allows a Denial of Service (memory consumption) via a crafted serialized payload (e.g., using s:1000000000), leading to a PHP Object Injection issue. Remote, unauthenticated attackers can trigger this by sending a malicious serialized object, which forces excessive memory usage, rendering Adminer’s interface unresponsive and causing a server-level DoS. While the server may recover after several minutes, multiple simultaneous requests can cause a complete crash requiring manual intervention.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | vrana/adminer | <= 4.8.1 | no fix |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L- Weakness (CWE)
CWE-502- Platform
- Composer
- Package
vrana/adminer- Disclosed
- 25.08.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-mqh4-2mm8-g7w9 - CC BY 4.0
Vulnerability history: vrana/adminer
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 02.2021 02.2026
- Without a fix
- 1
- Exploited in attacks
- 1
Severity breakdown
- High 6
- Medium 2
Disclosures per year
- 2021: 3
- 2022: 2
- 2023: 0
- 2024: 1
- 2025: 1
- 2026: 1
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Adminer PHP Object Injection issue leads to Denial of Service this entry
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