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TI-2026-59018 Aliases CVE-2026-86231GHSA-x2rp-h5qg-fmqg

mwiede jsch KnownHosts.java getRevokedKeys improper check for certificate revocation

Priority MEDIUM 61CWE-298Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0042 36th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed jsch (mwiede): 2.28.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
mwiedejsch2.28.0; 2.28.1; 2.28.2; 2.28.3; 2.28.4; 2.28.52.28.6Patch availableCNA
  • jsch Vendormwiede Affected 2.28.0; 2.28.1; 2.28.2; 2.28.3; 2.28.4; 2.28.5 Fixed in 2.28.6 Patch available CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:mwiede:jsch:*:*:*:*:*:*:*:*——mwiede
  • cpe:2.3:a:mwiede:jsch:*:*:*:*:*:*:*:* Versions — — ·mwiede

Remediation

  • Fix · CNA jsch (mwiede) Fixed in 2.28.6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-86231
  2. 2026-10-03 Alias added: GHSA-x2rp-h5qg-fmqg

References

Exploit 1

Patch 3

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences