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Description

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.

PUBLISHED Reserved 2026-05-28 | Published 2026-05-28 | Updated 2026-05-29 | Assigner NCSC.ch




LOW: 2.9CVSS: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:L/U:Green

Problem types

CWE-502 Deserialization of untrusted data

Product status

Default status
unaffected

Any version
affected

1.5.33
unaffected

Credits

York Shen https://github.com/york-shen finder

References

logback.qos.ch/news.html

cve.org (CVE-2026-9828)

nvd.nist.gov (CVE-2026-9828)

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