Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Logback-core versions up to and including 1.5.24 are vulnerable to arbitrary class instantiation during configuration file processing. An attacker who can write to an existing logback configuration file can cause classes already on the class path to be instantiated, though the source notes that such instances are likely discarded afterward and that a potentially malicious class must already be present. Upgrade ch.qos.logback:logback-core to version 1.5.25 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 1.8 | Low | 4.0 | CVSS: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 | CNA (NCSC.ch) |
- CISA KEV Not listed.
- EPSS 0.0016, the 5th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:17 UTC First seen by agentprime
- 31 Oct 2026, 14:17 UTC Confirmed by OSV