Bug 2482698 (CVE-2026-9828)

Summary:	CVE-2026-9828 logback: Logback: Object injection via deserialization of untrusted data
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in logback. An attacker able to influence serialized data sent to SimpleSocketServer or SimpleSSLSocketServer could exploit a deserialization of untrusted data vulnerability, allowing for object injection. This could enable the instantiation of objects from certain Java classes that are not explicitly blocked. While no practical way to achieve remote code execution or significant privilege escalation has been identified, this issue bypasses intended security restrictions.	Story Points:	---
Clone Of:		Environment:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2489276
Bug Blocks:

Description OSIDB Bzimport 2026-05-28 15:01:29 UTC

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 objects from
 classes in the java.lang and java.util packages that are not explicitly
 blocked.

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 1.5.32 inclusive.