EUVD-2026-42146
GHSA-gp5v-jg37-fvg6
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Victim must connect to a hostile server (UI:R) and the attacker must win the rekey host-key-change race (AC:H); primary impact is client memory disclosure (C:H) with lesser integrity/availability effect.
Primary rating from Vendor (mitre).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Lifecycle Timeline
8DescriptionNVD
ssh in OpenSSH before 10.4 can have a use-after-free when a server changes its host key during a key re-exchange. (This outcome occurs only on the client side.)
AnalysisAI
Memory corruption in the OpenSSH client (ssh) before 10.4 lets a malicious or compromised SSH server trigger a use-after-free on the connecting client by changing its host key during a key re-exchange (rekey), potentially leading to information disclosure or code execution in the client process. Only the client side is affected; the server is not vulnerable. …
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Recommended ActionAI
Within 24 hours: Audit all systems running OpenSSH client to identify versions prior to 10.4. …
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Same weakness CWE-416 – Use After Free
View allSame technique Memory Corruption
View allShare
External POC / Exploit Code
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