CVE-2026-42027
critical
CVSS v3
9.8
CVSS v2
—
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
Vendor advisory: security@apache.org — https://lists.apache.org/thread/ltlo4powjfc0w2w2yyl1o5tc7q1gcb2y
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-42027
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | fixed | 2.5.9-1 |
| debian | sid | fixed | 2.5.9-1 |
| debian | trixie | 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
Verify integrity in audit chain (admin only). AS-IS.