CVE-2026-86231

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-09-06 23:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-09-11 21:17 UTC Last updatedMost recent change to the record

Details

Published

2026-09-06 23:17 UTC

Last modified

2026-09-11 21:17 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-298

Record status

Deferred

Attack profile CVSS 4.0 · 2.9

Attack vector

Network

Complexity

High

Attack requirements

None

Privileges needed

None

User interaction

None

Confidentiality

None

Integrity

Low

Availability

None