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Logback deserialization whitelist bypass for Proxy objects

QOS.CH Sarl logback · CVE-2026-10532
0 news outlets0 CERTs and agencies0 researchers

What is it?

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.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
2.9
EPSS
0.4%
First seen
9 h ago
Status
corroborated

All QOS.CH Sarl vulnerabilities