CVE-2026-86231
Performing a manipulation of the argument known_hosts results in improper check for certificate revocation.
Does this matter?
Lower severity and a low EPSS score (0.27%). Track it; it rarely justifies an emergency change on its own.
Description
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 4.0
- 2.9 LOWCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.27% probability · 20th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-298, CWE-299
- Source
- cna@vuldb.com
References
- https://github.com/mwiede/jsch/
- https://github.com/mwiede/jsch/commit/194a2f76a5c0f1c3f778565be3fd66bcafc42d23
- https://github.com/mwiede/jsch/issues/1091
- https://github.com/mwiede/jsch/pull/1098
- https://github.com/mwiede/jsch/releases/tag/jsch-2.28.6
- https://vuldb.com/cve/CVE-2026-86231
- https://vuldb.com/submit/898485
- https://vuldb.com/vuln/399388
- https://vuldb.com/vuln/399388/cti
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.