VDB
CVE-2026-86231
CVE-2026-86231
PUBLISHED
CVSS 6.3 MEDIUM
Reported by VulDB · Published September 6, 2026
A security flaw has been discovered in mwiede jsch up to 2.28.5. Affected is the function getRevokedKeys of the file src/main/java/com/jcraft/jsch/KnownHosts.java. Performing a manipulation of the argument known_hosts results in improper check for certificate revocation. The attack is possible to be carried out remotely. The attack is considered to have high complexity. The exploitability is told to be difficult. The exploit has been released to the public and may be used for attacks. Upgrading to version 2.28.6 is able to address this issue. The patch is named 194a2f76a5c0f1c3f778565be3fd66bcafc42d23. You should upgrade the affected component.
Risk Scores
CVSS 4.0
6.3
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| mwiede | jsch | 2.28.0, 2.28.1, 2.28.2 |
| mwiede | jsch | 2.28.0, 2.28.1, 2.28.2 |
Timeline
- Sep 6, 2026 CVE Published
- Sep 7, 2026 EPSS Score
- Sep 7, 2026 Coalition ESS Score
- Sep 9, 2026 EPSS Score
- Sep 11, 2026 CVE Updated
- Sep 12, 2026 EPSS Score
- Sep 16, 2026 EPSS Score
- Sep 18, 2026 EPSS Score
References
- VDB-399388 | mwiede jsch KnownHosts.java getRevokedKeys improper check for certificate revocation vdb-entrytechnical-description
- VDB-399388 | CTI Indicators (IOB, IOC, TTP, IOA) signaturepermissions-required
- CVE-2026-86231 | CVE Analysis and Report third-party-advisory
- Submit #898485 | mwiede jsch 2.28.4 Cert Revocation Type String Bypass third-party-advisory
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