CVE-2026-35386: In OpenSSH before 10.3, command execution can occur via shell metacharacters in a username within a command li

Routine

LOW 3.6WATCHLISTUPGRADE

CVE-2026-35386 is a low-severity flaw (CVSS 3.6) affecting openssh. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In OpenSSH before 10.3, command execution can occur via shell metacharacters in a username within a command line. This requires a scenario where the username on the command line is untrusted, and also requires a non-default configurations of % in ssh_config.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	3.6 (Low)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-696
Published	2026-04-02
Last modified	2026-07-24

Publisher (CNA): MITRE · Vendor: openbsd

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-02 17:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

openbsd openssh UPGRADE

Affected: >= 10.0 and < 10.3

Fixed in: 10.3

Safe to downgrade to: a release before 10.0

1. Check installed version

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

2. UPGRADE to 10.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openssh

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 10.0 (Debian / Ubuntu)

apt-cache madison openssh sudo apt install openssh=<VERSION_BEFORE_10.0> sudo apt-mark hold openssh

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

dnf --showduplicates list openssh sudo dnf downgrade openssh-<VERSION_BEFORE_10.0> sudo dnf versionlock add openssh

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-2026-35386?

openssh: upgrade to 10.3. Exact commands for each OS are on this page.

Is CVE-2026-35386 being exploited?

CVE-2026-35386 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-2026-35386 affect?

CVE-2026-35386 affects openssh. Severity is low (CVSS 3.6). In OpenSSH before 10.3, command execution can occur via shell metacharacters in a username within a command line. This requires a scenario where the username on the command line is untrusted, and also requires a non-default configurations o

How urgent is CVE-2026-35386?

Priority 24/100. On your watchlist

Software pages

OpenSSH vulnerabilities

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References

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