Logback vulnerable to Object Injection through HardenedObjectInputStream modules
Deserialization of untrusted data vulnerability in QOS.CH Sarl logback logback-core (HardenedObjectInputStream (logback-core) modules) allows Object Injection, albeit heavily restricted.
More precisely, an attacker able to influence serialized data sent to SimpleSocketServer or SimpleSSLSocketServer can instantiate Proxy objects.
Although deserialization is heavily restricted by HardenedObjectInputStream and no practical way to achieve remote code execution or significant privilege escalation has been identified, this issue constitutes a bypass of the intended security restrictions.
This issue affects logback: through 1.5.33 inclusive.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | ch.qos.logback:logback-core | < 1.5.34 | 1.5.34 |
References
- CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:P/RE:M/U:Green- Weakness (CWE)
CWE-502- Platform
- Java / Kotlin (Maven)
- Package
ch.qos.logback:logback-core- Disclosed
- 01.06.2026
- Updated
- 11.10.2026 13:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-jhq6-gfmj-v8fx - CC BY 4.0
Vulnerability history: ch.qos.logback:logback-core
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 10
- First → latest
- 06.2021 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 2
- Medium 3
- Low 4
Disclosures per year
- 2021: 2
- 2022: 0
- 2023: 2
- 2024: 2
- 2025: 1
- 2026: 3
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Logback vulnerable to Object Injection through HardenedObjectInputStream modules this entry
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