CVE-2026-115895: Happy DOM is a JavaScript implementation of a web browser without its graphical user interface

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HIGH 8.8

CVE-2026-115895 is a high-severity flaw (CVSS 8.8) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. From 17.0.0 until 21.0.4, packages/happy-dom/src/module/ECMAScriptModuleCompiler.ts accepts a named ESM import alias without validating that it is a JavaScript binding identifier before inserting it into a generated destructuring binding. With enableJavaScriptEvaluation enabled, attacker-controlled HTML or module source can use an invalid alias that be

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-94
Published	2026-10-23
Last modified	2026-10-23

Publisher (CNA): GitHub, Inc.

Timeline

2026-10-23 22:16 UTCPublished CVE record published
2026-10-23 22:16 UTCUpdated Record last modified

Exact fixes by distribution

npm · happy-dom · FIXED · 21.0.4 · vulnerable: >= 17.0.0, <= 21.0.3 · source

npm install happy-dom@">=21.0.4" npm ls happy-dom

Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source

sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310

Fedora 46 · moby-engine · FIXED · 29.9.2-2.fc46 · FEDORA-2026-4856be87b3 · source

sudo dnf upgrade --advisory=FEDORA-2026-4856be87b3

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-2026-115895?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-115895 being exploited?

CVE-2026-115895 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-2026-115895 affect?

CVE-2026-115895 affects affected software. Severity is high (CVSS 8.8). Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. From 17.0.0 until 21.0.4, packages/happy-dom/src/module/ECMAScriptModuleCompiler.ts accepts a named ESM import alias without validating that it

How urgent is CVE-2026-115895?

Priority 42/100. High severity

References

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