How severe is GHSA-4gw3-8f77-f72c?

GHSA-4gw3-8f77-f72c has a CVSS score of 5.3/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-4gw3-8f77-f72c?

GHSA-4gw3-8f77-f72c affects the following packages: codemirror (npm). Ecosystems affected: npm.

How do I fix GHSA-4gw3-8f77-f72c?

Update codemirror to 5.58.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4gw3-8f77-f72c is resolved across your whole dependency graph.

How do I detect GHSA-4gw3-8f77-f72c in my npm dependencies?

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

How do I mitigate GHSA-4gw3-8f77-f72c if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is GHSA-4gw3-8f77-f72c actively exploited in the wild?

Yes. There are 7 known exploit references for GHSA-4gw3-8f77-f72c, including 7 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for GHSA-4gw3-8f77-f72c?

GHSA-4gw3-8f77-f72c has an EPSS (Exploit Prediction Scoring System) score of 5.3%, placing it in the 92th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-4gw3-8f77-f72c?

GHSA-4gw3-8f77-f72c is classified as Uncontrolled Resource Consumption (CWE-400). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-4gw3-8f77-f72c published, and has it been updated?

GHSA-4gw3-8f77-f72c was published on May 10, 2021 and was last updated on January 14, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦

📦 npm

Not in CISA KEV

MEDIUM severity

Regular expression denial of service in codemirrorGHSA-4gw3-8f77-f72c

MEDIUMFix: codemirror/CodeMirror@55d0333

GHSA-4gw3-8f77-f72c is a medium-severity (CVSS 5.3) Uncontrolled Resource Consumption vulnerability in codemirror. 7 public exploit references exist, so weaponization risk is real. A fix is available for codemirror — see the affected versions and patch details below.

Also known asCVE-2020-7760

Published

May 10, 2021

Updated

Jan 14, 2025

Affected

1 pkg

Patched

1 / 1

Exploits

7 known

Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

5.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs92th percentile — riskier than 92% of all scored CVEsHighest risk

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

How urgent is this, really

GHSA-4gw3-8f77-f72c by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

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.

4Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream

codemirrornpm

10.9Mdownloads / week

Description

This affects the package codemirror before 5.58.2; the package org.apache.marmotta.webjars:codemirror before 5.58.2. The vulnerable regular expression is located in https://github.com/codemirror/CodeMirror/blob/cdb228ac736369c685865b122b736cd0d397836c/mode/javascript/javascript.jsL129. The ReDOS vulnerability of the regex is mainly due to the sub-pattern (s|/.?/)

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`codemirror`	all versions	5.58.2`npm install codemirror@5.58.2`

Affected Products

6 products · 6 configurations

Application

codemirrorcodemirror

< 5.58.2

range

Application

application expressoracle

< 20.2

range

Application

enterprise manager express user interfaceoracle

1 version

19c

Application

essbaseoracle

1 version

21.2

Application

hyperion data relationship managementoracle

< 11.2.9.0

range

Application

spatial studiooracle

< 19.1.0

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.