CVE-2026-0930Network attack vector

Stack-memory disclosure via terminal resize request

Published Apr 20, 2026 · Updated Apr 20, 2026

Buffer over-read in wolfSSHd 1.4.15 through 1.4.22 allows remote authenticated users to disclose stack memory via terminal resize requests. The Windows terminal-resize request handler reads past its stack buffer and sends adjacent bytes through the pseudo-console output. A valid SSH account and an established Windows wolfSSHd session are required; exposure is limited to adjacent process-stack contents.

CVSS severity2.3
Low
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Buffer over-read in wolfSSHd 1.4.15 through 1.4.22 allows remote authenticated users to disclose stack memory via terminal resize requests. The Windows terminal-resize request handler reads past its stack buffer and sends adjacent bytes through the pseudo-console output. A valid SSH account and an established Windows wolfSSHd session are required; exposure is limited to adjacent process-stack contents.

The record

CVE
CVE-2026-0930
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
wolfSSL
Product
wolfSSH
Classifications
CWE-126, CWE-125, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1.4.15 <1.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

wolfSSL · wolfSSHversion=1.4.15 <1.5.0

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
2.3wolfSSLCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-126Buffer Over-read
CWE-125Out-of-bounds Read
T1005Data from Local System

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo