CVE-2026-41589: Wish is an SSH server with defaults and a collection of middlewares

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CRITICAL 9.6DOWNGRADE

CVE-2026-41589 is a critical-severity flaw (CVSS 9.6) affecting wish. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Wish is an SSH server with defaults and a collection of middlewares. From version 2.0.0 to before version 2.0.1, the SCP middleware in charm.land/wish/v2 is vulnerable to path traversal attacks. A malicious SCP client can read arbitrary files from the server, write arbitrary files to the server, and create directories outside the configured root directory by sending crafted filenames containing ../ sequences over the SCP protocol. This issue has

Why this priority

Critical severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-05-07
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: charm

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

Am I affected?

Timeline

2026-05-07 14:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

charm wish DOWNGRADE

Affected: 2.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison wish sudo apt install wish=<VERSION_BEFORE_2.0.0> sudo apt-mark hold wish

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list wish sudo dnf downgrade wish-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add wish

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-2026-41589?

wish: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-41589 being exploited?

CVE-2026-41589 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-2026-41589 affect?

CVE-2026-41589 affects wish. Severity is critical (CVSS 9.6). Wish is an SSH server with defaults and a collection of middlewares. From version 2.0.0 to before version 2.0.1, the SCP middleware in charm.land/wish/v2 is vulnerable to path traversal attacks. A malicious SCP client can read arbitrary fil

How urgent is CVE-2026-41589?

Priority 47/100. Critical severity; Public exploit reference

References

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