SB2026071556 - Deserialization of untrusted data in QOS logback-core

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Main Vulnerability Database SB2026071556

SB2026071556 - Deserialization of untrusted data in QOS logback-core

Published: July 15, 2026

Security Bulletin ID SB2026071556
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Deserialization of Untrusted Data (CVE-ID: CVE-2026-9828)

CWE-ID: CWE-502 - Deserialization of Untrusted Data

CVSSv4: 6.3 [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]


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insecure input validation when processing serialized data in the QOS.CH Sarl logback logback-core (HardenedObjectInputStream (logback-core) modules). A remote 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.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Remediation

Install update from vendor's website.

References