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Vulnerabilities/CVE-2025-26466Public Intelligence Dossier
Source: openbsd · Limited verification•Last verified: •Collection Degraded
CVE-2025-26466Unknown / EvaluatingMEDIUM (raw)CVSS 5.9CWE-770

A flaw was found in the OpenSSH package

Published: 01 Mar 2025•Last updated: 15 Oct 2026, 07:47 AM IST•Source identifier: secalert@redhat.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
5.9MEDIUM (raw)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Metric sourcesecalert@redhat.com
EPSS probability
40.7%0.406
Percentile99th
Weakness type
CWE-770
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.

SOC priority

Medium

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: Microsoft or Microsoft-managed product relevance; No confirmed exploitation signal in current enrichment

Affected Products & Remediation

3 source-backed products
Affected products and versions (source)
  • openbsd openssh · 9.5; 9.6; 9.7; 9.8; 9.9 · NVD CPE · Source
  • canonical ubuntu linux · 24.04; 24.10 · NVD CPE · Source
  • debian debian linux · 11.0; 12.0; 13.0 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Confirm the source-stated update is installed and the CVE is no longer reported.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies remediation. · Rule network-unauthenticated

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
secalert@redhat.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:openbsd:openssh:9.5:p1:*:*:*:*:*:*, cpe:2.3:a:openbsd:openssh:9.6:-:*:*:*:*:*:*, cpe:2.3:a:openbsd:openssh:9.6:p1:*:*:*:*:*:*, cpe:2.3:a:openbsd:openssh:9.7:-:*:*:*:*:*:*, cpe:2.3:a:openbsd:openssh:9.7:p1:*:*:*:*:*:*, cpe:2.3:a:openbsd:openssh:9.8:-:*:*:*:*:*:*, cpe:2.3:a:openbsd:openssh:9.8:p1:*:*:*:*:*:*, cpe:2.3:a:openbsd:openssh:9.9:-:*:*:*:*:*:*, cpe:2.3:a:openbsd:openssh:9.9:p1:*:*:*:*:*:*, cpe:2.3:o:canonical:ubuntu_linux:24.04:*:*:*:lts:*:*:*

Evidence & Provenance

3 public sources
nvd.nist.govSource recordaccess.redhat.comSource recordaccess.redhat.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2025-26466
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2025-26466
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2025-26466"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

Correlated briefings

— No published briefing references this CVE

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.