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HIGH severity

CVE-2021-4306 — terminal-kit

HIGHFix: cronvel/terminal-kit@a2e446c

CVE-2021-4306 is a high-severity (CVSS 7.5) CWE-1333 vulnerability in terminal-kit. A fix is available for terminal-kit — see the affected versions and patch details below.

terminal-kit Inefficient Regular Expression Complexity vulnerability

Also known asGHSA-wxgh-8gmr-3qh3
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 19, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.0%probability of exploitation in next 30 days
Lower Risk+0.04%
Lower risk than most CVEs62th percentile — riskier than 62% of all scored CVEsHighest risk
0.00%0.50%0.99%1.49%0.5%1.0%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

719other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
terminal-kitnpm
96Kdownloads / week

Description

A vulnerability classified as problematic has been found in cronvel terminal-kit up to 2.1.7. Affected is an unknown function. The manipulation leads to inefficient regular expression complexity. Upgrading to version 2.1.8 is able to address this issue. The name of the patch is a2e446cc3927b559d0281683feb9b821e83b758c. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-217620.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmterminal-kitall versions2.1.8npm install terminal-kit@2.1.8

Affected Products

1 product · 1 configurations
Application
terminal-kitterminal-kit_project
< 2.1.8
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for terminal-kit, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update terminal-kit to 2.1.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-4306 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

A vulnerability classified as problematic has been found in cronvel terminal-kit up to 2.1.7. Affected is an unknown function. The manipulation leads to inefficient regular expression complexity. Upgrading to version 2.1.8 is able to address this issue. The name of the patch is a2e446cc3927b559d0281683feb9b821e83b758c. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-217620.
O3 Security · Impact-Aware SCA

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CVE-2021-4306: terminal-kit — Fixed in 2.1.8