CVE-2026-86231

LOW 3.7

mwiede jsch KnownHosts.java getRevokedKeys improper check for certificate revocation

CVSS Score

3.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-299 CWE-298
Vendor	mwiede
Product	jsch
Published	Sep 6, 2026
Last Updated	Sep 11, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

mwiede / jsch

2.28.0 2.28.1 2.28.2 2.28.3 2.28.4 2.28.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/399388 vuldb.com: https://vuldb.com/vuln/399388/cti vuldb.com: https://vuldb.com/cve/CVE-2026-86231 vuldb.com: https://vuldb.com/submit/898485 github.com: https://github.com/mwiede/jsch/issues/1091 github.com: https://github.com/mwiede/jsch/pull/1098 github.com: https://github.com/mwiede/jsch/commit/194a2f76a5c0f1c3f778565be3fd66bcafc42d23 github.com: https://github.com/mwiede/jsch/releases/tag/jsch-2.28.6 github.com: https://github.com/mwiede/jsch/

Credits

🔍 Yu Bao from PayPal Cyber Security Team (VulDB User)