CVE-2026-42027
critical
CVSS v3
9.8
CVSS v4 NEW
—
VIR risk
9.8
Description
Apache OpenNLP ExtensionLoader Vulnerable to Arbitrary Class Instantiation via Model Manifest
Predictions
Exploit likelihood
97%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Affected | — |
| sid | Fixed | 2.5.9-1 |
| forky | Fixed | 2.5.9-1 |
| bullseye | Affected | — |
| bookworm | Affected | — |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Maven | org.apache.opennlp:opennlp-tools | <2.5.9 | 2.5.9 |
| Maven | org.apache.opennlp:opennlp-tools | >=3.0.0-M1,<3.0.0-M3 | 3.0.0-M3 |
| MAVEN | org.apache.opennlp:opennlp-tools | >= 3.0.0-M1, < 3.0.0-M3 | 3.0.0-M3 |
| MAVEN | org.apache.opennlp:opennlp-tools | < 2.5.9 | 2.5.9 |
References
- https://security-tracker.debian.org/tracker/CVE-2026-42027
- https://lists.apache.org/thread/ltlo4powjfc0w2w2yyl1o5tc7q1gcb2y
- http://www.openwall.com/lists/oss-security/2026/05/01/20
- https://nvd.nist.gov/vuln/detail/CVE-2026-42027
- https://github.com/apache/opennlp
- https://github.com/advisories/GHSA-cx4m-2p55-rw7j
CWEs
CWE-470
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.