Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Apache Lucene Replicator (org.apache.lucene:lucene-replicator) versions 4.4.0 before 9.12.0 are affected, specifically the deprecated org.apache.lucene.replicator.http package; the nrt package is not affected. An attacker with network access to a deployed replicator server and a matching client could trigger unsafe deserialization of untrusted data. Upgrade to version 9.12.0, which fixes the issue. On affected versions, Java serialization filters such as a restrictive jdk.serialFilter setting can mitigate the risk without affecting functionality.
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 |
|---|---|---|---|---|
| 5.1 | Medium | 3.1 | CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L | CNA (apache) |
- CISA KEV Not listed.
- EPSS 0.0058, the 48th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:12 UTC First seen by agentprime
- 31 Oct 2026, 15:12 UTC Confirmed by OSV