EUVD-2026-72179
GHSA-x2rp-h5qg-fmqg
Severity by source
CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable but requires specific known_hosts config and MITM positioning (AC:H); no privileges needed; integrity-only impact as revoked cert is accepted.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
6DescriptionCVE.org
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.
AnalysisAI
Certificate revocation bypass in mwiede jsch through version 2.28.5 allows unauthenticated remote attackers to have a revoked SSH host certificate accepted as trusted during host verification. The setKnownHosts() parser in KnownHosts.java failed to recognize OpenSSH certificate key types (e.g., ssh-ed25519-cert-v01@openssh.com) as valid when paired with the @revoked marker, causing such entries to be skipped rather than tracked in the revocation pool - silently nullifying the revocation check. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all three of the following: (1) the Java application uses mwiede jsch version ≤2.28.5 as its SSH client library, (2) the known_hosts file used by that application contains `@revoked` entries whose key type is an OpenSSH certificate type - specifically any of `ssh-ed25519-cert-v01@openssh.com`, `ecdsa-sha2-nistp256-cert-v01@openssh.com`, `rsa-sha2-256-cert-v01@openssh.com`, or `rsa-sha2-512-cert-v01@openssh.com` - and (3) an attacker can present a certificate matching that revoked entry during the SSH handshake (requires network positioning or control of the target hostname). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 vector (AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N) scores 6.3, reflecting network exposure but high attack complexity and limited integrity-only impact - this calibration appears accurate. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to mwiede jsch version 2.28.6, which contains the fix in commit 194a2f76a5c0f1c3f778565be3fd66bcafc42d23 (https://github.com/mwiede/jsch/pull/1098). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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