CVE-2026-60002Network attack vector

Client memory corruption via host-key re-exchange

Published Jul 8, 2026 · Updated Jul 8, 2026

Use-after-free in OpenSSH ssh before 10.4 allows remote attackers to corrupt client memory by changing the host key during rekeying. The client’s re-exchange path accesses host-key state after that allocation has been freed when the server supplies a different key. The required gate is a key re-exchange with a server that substitutes its host key; published material does not establish code execution or a reliable crash.

CVSS severity7.7
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in OpenSSH ssh before 10.4 allows remote attackers to corrupt client memory by changing the host key during rekeying. The client’s re-exchange path accesses host-key state after that allocation has been freed when the server supplies a different key. The required gate is a key re-exchange with a server that substitutes its host key; published material does not establish code execution or a reliable crash.

The record

CVE
CVE-2026-60002
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
OpenBSD Project
Product
OpenSSH
Classifications
CWE-416
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <10.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenBSD Project · OpenSSHversion=0 <10.4

Published CVSS scores

7.7MITRECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
9.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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