Improper Validation of Certificate Expiration Affecting jsch package, versions *


Severity

Recommended
0.0
low
0
10

Based on Debian security rating.

Threat Intelligence

EPSS
0.42% (34th percentile)

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  • Snyk IDSNYK-DEBIAN13-JSCH-19784406
  • published14 Sept 2026
  • disclosed6 Sept 2026

Introduced: 6 Sep 2026

CVE-2026-86231  (opens in a new tab)
CWE-298  (opens in a new tab)
CWE-299  (opens in a new tab)

How to fix?

There is no fixed version for Debian:13 jsch.

NVD Description

Note: Versions mentioned in the description apply only to the upstream jsch package and not the jsch package as distributed by Debian. See How to fix? for Debian:13 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1