CVE-2021-41088: Elvish is a programming language and interactive shell, combined into one package

Q: How do I fix CVE-2021-41088?

elvish: upgrade to 0.14.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-41088 being exploited?

CVE-2021-41088 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-41088 affect?

CVE-2021-41088 affects elvish. Severity is high (CVSS 8.0). Elvish is a programming language and interactive shell, combined into one package. In versions prior to 0.14.0 Elvish's web UI backend (started by `elvish -web`) hosts an endpoint that allows executing the code sent from the web UI. The bac

Routine

HIGH 8.0UPGRADE

CVE-2021-41088 is a high-severity flaw (CVSS 8.0) affecting elvish. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Elvish is a programming language and interactive shell, combined into one package. In versions prior to 0.14.0 Elvish's web UI backend (started by `elvish -web`) hosts an endpoint that allows executing the code sent from the web UI. The backend does not check the origin of requests correctly. As a result, if the user has the web UI backend open and visits a compromised or malicious website, the website can send arbitrary code to the endpoint in l

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.0 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-668, CWE-346
Published	2021-09-23
Last modified	2026-06-17

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

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-09-23 20:15 UTCPublished CVE record published
2026-06-17 04:07 UTCUpdated Record last modified

elv elvish UPGRADE

Affected: < 0.14.0

Fixed in: 0.14.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.14.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade elvish

Note

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

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-2021-41088?

elvish: upgrade to 0.14.0. Exact commands for each OS are on this page.

Is CVE-2021-41088 being exploited?

CVE-2021-41088 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-2021-41088 affect?

CVE-2021-41088 affects elvish. Severity is high (CVSS 8.0). Elvish is a programming language and interactive shell, combined into one package. In versions prior to 0.14.0 Elvish's web UI backend (started by `elvish -web`) hosts an endpoint that allows executing the code sent from the web UI. The bac

How urgent is CVE-2021-41088?

Priority 39/100. High severity

References

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