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Description

ACE vulnerability in configuration file processing by QOS.CH logback-core up to and including version 1.5.24 in Java applications, allows an attacker to instantiate classes already present on the class path by compromising an existing logback configuration file. The instantiation of a potentially malicious Java class requires that said class is present on the user's class-path. In addition, the attacker must have write access to a configuration file. However, after successful instantiation, the instance is very likely to be discarded with no further ado.

PUBLISHED Reserved 2026-01-20 | Published 2026-01-22 | Updated 2026-01-22 | Assigner NCSC.ch




LOW: 1.8CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/S:N/AU:N/RE:M/U:Green

Problem types

CWE-20 Improper Input Validation

Product status

Default status
unknown

0.9.20 (maven)
affected

1.5.25
unaffected

Credits

https://www.code-intelligence.com/ finder

Google Fuzz finder

References

logback.qos.ch/news.html

cve.org (CVE-2026-1225)

nvd.nist.gov (CVE-2026-1225)

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