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OpenSSH EUVDEUVD-2026-18398

| CVE-2026-35385 HIGH
Improper Preservation of Permissions (CWE-281)
2026-04-02 mitre GHSA-jgqr-738j-43cg
Information Disclosure SSH Openssh
8.1
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.5 HIGH

Attacker needs no local privileges (PR:N) but root must actively run scp with legacy -O and no -p against a hostile source, so UI:R and AC:H; setuid-root outcome yields full C/I/A impact.

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Red Hat
7.5 HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

13
Analysis Updated
Jun 30, 2026 - 04:40 vuln.today
v6 (cvss_changed)
Analysis Updated
Jun 30, 2026 - 04:40 vuln.today
v5 (cvss_changed)
Analysis Updated
Jun 30, 2026 - 04:39 vuln.today
v4 (cvss_changed)
Analysis Updated
Jun 30, 2026 - 04:38 vuln.today
v3 (cvss_changed)
CVSS changed
Jun 30, 2026 - 03:24 NVD
7.5 (HIGH) 8.1 (HIGH)
Analysis Updated
Apr 27, 2026 - 14:14 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 27, 2026 - 14:07 vuln.today
cvss_changed
Analysis Updated
Apr 16, 2026 - 06:08 EUVD-patch-fix
executive_summary
Re-analysis Queued
Apr 16, 2026 - 05:29 backfill_euvd_patch
patch_released
Patch available
Apr 16, 2026 - 05:29 EUVD
10.3
EUVD ID Assigned
Apr 02, 2026 - 17:00 euvd
EUVD-2026-18398
Analysis Generated
Apr 02, 2026 - 17:00 vuln.today
CVE Published
Apr 02, 2026 - 16:30 nvd
HIGH 7.5

DescriptionNVD

In OpenSSH before 10.3, a file downloaded by scp may be installed setuid or setgid, an outcome contrary to some users' expectations, if the download is performed as root with -O (legacy scp protocol) and without -p (preserve mode).

AnalysisAI

Privilege-escalation exposure in OpenSSH before 10.3 (fixed in 10.3p1) where scp, when run by root using the legacy SCP protocol flag -O and without -p (preserve mode), may write a downloaded file with setuid or setgid bits set, contrary to user expectation. A malicious or compromised SSH server (or a man-in-the-middle on the transfer) could thereby cause an attacker-controlled binary to land on disk as a setuid/setgid-root executable, enabling local privilege escalation when it is later run. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker controls or compromises source SSH server
Delivery
Root victim runs scp -O without -p
Exploit
Server advertises setuid/setgid mode bits
Execution
File written locally as setuid-root binary
Persist
Low-privileged user executes binary
Impact
Local privilege escalation to root
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Vulnerability AssessmentAI

Exploitation Exploitation requires all of the following concrete conditions drawn from the description: the scp transfer must be performed by root; the legacy SCP protocol must be selected with the -O flag; the -p (preserve mode) flag must NOT be used; and the remote file source must be attacker-influenced (a malicious or compromised SSH server, or a MITM position on the transfer) so it can advertise setuid/setgid mode bits. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are mixed and point to a real-but-conditional risk rather than an urgent mass-exploitation event. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An administrator runs scp as root with the legacy -O flag (and without -p) to fetch a tool or binary from a server an attacker controls or has compromised. The malicious server marks the transferred file with the setuid-root bit, so it lands on the admin's host as a setuid-root executable; a low-privileged local user (or the attacker via a planted payload) then runs it to gain root. …
Remediation Vendor-released patch: upgrade to OpenSSH 10.3 / 10.3p1 or later (per https://www.openssh.org/releasenotes.html#10.3p1), or apply your distribution's fixed package - Ubuntu USN-8222-1 and the Red Hat RHSA errata listed above deliver the backported fix. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Conduct inventory of systems running OpenSSH versions prior to 10.3. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SLES15-SP5-CHOST-BYOS-SAP-CCloud Fixed
SLES15-SP6-CHOST-BYOS Fixed
SLES15-SP6-CHOST-BYOS-Aliyun Fixed
SLES15-SP6-CHOST-BYOS-Azure Fixed
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EUVD-2026-18398 vulnerability details – vuln.today
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