CVE-2026-0930: Potential read out of bounds case with wolfSSHd on Windows while handling a terminal resize request

Routine

MEDIUM 4.3UPGRADE

CVE-2026-0930 is a medium-severity flaw (CVSS 4.3) affecting wolfssh. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Potential read out of bounds case with wolfSSHd on Windows while handling a terminal resize request. An authenticated user could trigger the out of bounds read after establishing a connection which would leak the adjacent stack memory to the pseudo-console output.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-126, CWE-125
Published	2026-04-20
Last modified	2026-10-26

Publisher (CNA): wolfSSL Inc. · Vendor: wolfssh

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-20 22:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

wolfssh wolfssh UPGRADE

Affected: >= 1.4.15 and < 1.5.0

Fixed in: 1.5.0

Safe to downgrade to: a release before 1.4.15

1. Check installed version

apt-cache policy wolfssh || rpm -q wolfssh || wolfssh --version

2. UPGRADE to 1.5.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade wolfssh

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wolfssh

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.4.15 (Debian / Ubuntu)

apt-cache madison wolfssh sudo apt install wolfssh=<VERSION_BEFORE_1.4.15> sudo apt-mark hold wolfssh

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list wolfssh sudo dnf downgrade wolfssh-<VERSION_BEFORE_1.4.15> sudo dnf versionlock add wolfssh

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-0930?

wolfssh: upgrade to 1.5.0. Exact commands for each OS are on this page.

Is CVE-2026-0930 being exploited?

CVE-2026-0930 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-0930 affect?

CVE-2026-0930 affects wolfssh. Severity is medium (CVSS 4.3). Potential read out of bounds case with wolfSSHd on Windows while handling a terminal resize request. An authenticated user could trigger the out of bounds read after establishing a connection which would leak the adjacent stack memory to th

How urgent is CVE-2026-0930?

Priority 17/100. No elevated risk signals yet.

Software pages

Windows vulnerabilities

References

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