Description
JumpServer is an open source bastion host. When users enable MFA and use a public key for authentication, the Koko SSH server does not verify the corresponding SSH private key. An attacker could exploit a vulnerability by utilizing a disclosed public key to attempt brute-force authentication against the SSH service This issue has been patched in versions 3.6.5 and 3.5.6. Users are advised to upgrade. There are no known workarounds for this issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| jumpserver | jumpserver | >= 3.6.0, < 3.6.5, < 3.5.6 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | govulncheck-vulndb | 0.0.20250612T141001-1.1 | openSUSE-SU-2025:15225-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/jumpserver/jumpserver | < 3.5.6+incompatible · >= 3.6.0+incompatible, < 3.6.5+incompatible | 3.5.6+incompatible, 3.6.5+incompatible | GO-2025-3570 |
| Go | github.com/jumpserver/koko | all versions | — | GO-2025-3570 |
Advisories 1
- openSUSE-SU-2025:15225-1 govulncheck-vulndb-0.0.20250612T141001-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026