QOS logback up to 1.5.32 deserialization

Summaryinfo

A vulnerability, which was classified as problematic, has been found in QOS logback up to 1.5.32. This affects an unknown function. Performing a manipulation results in deserialization. This vulnerability is cataloged as CVE-2026-9828. The attack must be initiated from a local position. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in QOS logback up to 1.5.32. This affects an unknown functionality. The manipulation with an unknown input leads to a deserialization vulnerability. CWE is classifying the issue as CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was shared by York Shen. It is possible to read the advisory at logback.qos.ch. This vulnerability is uniquely identified as CVE-2026-9828 since 05/28/2026. The exploitability is told to be difficult. Attacking locally is a requirement. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 317954 (Linux Distros Unpatched Vulnerability : CVE-2026-9828), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.5.33 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (317954) and CERT Bund (WID-SEC-2026-2242). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• IBM Operational Decision Manager

Productinfo

Vendor

• QOS

Name

• logback

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5
• 1.5.6
• 1.5.7
• 1.5.8
• 1.5.9
• 1.5.10
• 1.5.11
• 1.5.12
• 1.5.13
• 1.5.14
• 1.5.15
• 1.5.16
• 1.5.17
• 1.5.18
• 1.5.19
• 1.5.20
• 1.5.21
• 1.5.22
• 1.5.23
• 1.5.24
• 1.5.25
• 1.5.26
• 1.5.27
• 1.5.28
• 1.5.29
• 1.5.30
• 1.5.31
• 1.5.32

CPE 2.3info

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CPE 2.2info

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Be aware that VulDB is the high quality source for vulnerability data.

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