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CVE-2026-86231— mwiede jsch KnownHosts.java getRevokedKeys improper check for certificate revocation

Quick assessment

Affected
mwiede jsch
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Matthias Wiedemann JSch是Matthias Wiedemann个人开发者的一个Java实现的SSH2客户端库。 Matthias Wiedemann JSch 2.28.5及之前版本存在加密问题漏洞，该漏洞源于src/main/java/com/jcraft/JSch/KnownHosts.java文件中的getRevokedKeys函数对known_hosts参数的操作，导致证书撤销检查不当，可能允许远程攻击者利用该漏洞进行攻击。

CVSS 3.7 · Low EPSS 0.27% · P20

Affected Version Matrix 7

VendorProduct Version RangeStatus
mwiede jsch 2.28.0 affected
2.28.1 affected
2.28.2 affected
2.28.3 affected
2.28.4 affected
2.28.5 affected
2.28.6 unaffected
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I. Basic Information for CVE-2026-86231

Vulnerability Information
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Vulnerability Title
mwiede jsch KnownHosts.java getRevokedKeys improper check for certificate revocation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书撤销验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Matthias Wiedemann JSch 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Matthias Wiedemann JSch是Matthias Wiedemann个人开发者的一个Java实现的SSH2客户端库。 Matthias Wiedemann JSch 2.28.5及之前版本存在加密问题漏洞，该漏洞源于src/main/java/com/jcraft/JSch/KnownHosts.java文件中的getRevokedKeys函数对known_hosts参数的操作，导致证书撤销检查不当，可能允许远程攻击者利用该漏洞进行攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mwiede jsch 2.28.0 cpe:2.3:a:mwiede:jsch:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-86231

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III. Intelligence Information for CVE-2026-86231

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Patches & Fixes for CVE-2026-86231 (2)

Vendor Advisories for CVE-2026-86231 (2)

Vendor Pages for CVE-2026-86231 (2)

Other References for CVE-2026-86231 (2)

IV. Related Vulnerabilities

Same weakness: CWE-299

V. Comments for CVE-2026-86231

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