Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. In versions 15.10.0 through 20.8.7, a code injection vulnerability in ECMAScriptModuleCompiler allows an attacker to achieve Remote Code Execution (RCE) by injecting arbitrary JavaScript expressions inside export { } declarations in ES module scripts processed by happy-dom. The compiler directly interpolates unsanitized content into generated code as an executable expression, and the quote filter does not strip backticks, allowing template literal-based payloads to bypass sanitization. Version 20.8.8 fixes the issue.
CVE-2026-33943
“—” beside the score: it is equal to NVD's CVSS score.
This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.6% (50th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-16864 (ENISA EUVD)Source: ENISA EUVD
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
A fix is available — apply it.
- CVSS v3
- 9.8
- EG Score
- 9.8CRITICALmedium confidence
- EG Risk
- 60EG Risk 60/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity98% × 45%Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.6%
- EPSS %ILE
- 50th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.
- EG Severity
- 9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-26). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
March 27, 2026
Last Modified
October 26, 2026
Advisory Details (6)
Auto-updated Oct 26, 2026RCE in ECMAScriptModuleCompiler: unsanitized export names are interpolated as executable code · Advisory · capricorn86/happy-dom · GitHub
Affected: v15.10.2 and v20.0.0 respectively, but this vulnerable code path in
https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r642452522 – (CVE-2026-33943) CVE-2026-33943 happy-dom: Happy DOM: Remote Code Execution via JavaScript expression injection
https://bugzilla.redhat.com/show_bug.cgi?id=2452522CVE-2026-33943 - Red Hat Customer Portal
Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a
https://access.redhat.com/security/cve/CVE-2026-33943v20.8.8
Patch available: capricorn86/happy-dom v20.8.8
https://github.com/capricorn86/happy-dom/releases/tag/v20.8.8commit 5437fdf8f13a (capricorn86/happy-dom)
Patch available: capricorn86/happy-dom v20.11.4 (contains commit 5437fdf8f13a)
https://github.com/capricorn86/happy-dom/commit/5437fdf8f13adb9590f9f52616d9f69c3ee8db3cAffected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| happy-dom | — |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 15× in last 7d / 49× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 98 of 224 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 126 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.6% · 50th percentile
- 2026-10-27 05:38 UTCEG score recompute
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.6% · 50th percentile
- 2026-10-26 00:26 UTCEG score recompute
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.6% · 50th percentile
- 2026-10-25 14:34 UTCEG score recompute
- 2026-10-25 05:00 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 1.0% · 62nd percentile
- 2026-10-24 03:53 UTCEG score recompute
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 1.0% · 61st percentile
- 2026-10-23 02:43 UTCEG score recompute
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 1.0% · 61st percentile
- 2026-10-22 01:34 UTCEG score recompute
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 1.0% · 61st percentile
- 2026-10-21 00:26 UTCEG score recompute
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 1.0% · 61st percentile
- 2026-10-19 23:16 UTCEG score recompute
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 1.0% · 61st percentile
- 2026-10-18 22:07 UTCEG score recompute
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 1.0% · 61st percentile
- 2026-10-18 03:46 UTCEG score recompute
- 2026-10-17 20:28 UTCEG score recompute
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 1.0% · 61st percentile
- 2026-10-16 19:21 UTCEG score recompute
- 2026-10-16 16:41 UTCEPSS rescoreEPSS 1.0% · 61st percentile
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- 2026-10-15 16:55 UTCEG score recompute
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 1.0% · 61st percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 1.0% · 61st percentile
- 2026-10-14 10:53 UTCEG score recompute
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-10-13 09:34 UTCEG score recompute
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-10-12 16:13 UTCEG score recompute
- 2026-10-11 19:55 UTCEG score recompute
- 2026-10-11 17:08 UTCEG score recompute
- 2026-10-11 14:35 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-10-11 04:01 UTCOSV refresh
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-10-08 17:12 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-09-26 00:26 UTCEPSS rescoreEPSS 1.0% · 60th percentile
- 2026-09-21 15:49 UTCOSV refresh
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-09-02 13:04 UTCOSV refresh
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-16 09:55 UTCEG score recompute
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-14 06:15 UTCEG score recompute
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
- 2026-08-12 20:33 UTCEG score recompute
- 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
- 2026-08-11 20:43 UTCEG score recompute
- 2026-08-11 03:44 UTCEG score recompute
- 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
- 2026-08-09 17:25 UTCEG score recompute
- 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.8% · 52nd percentile
Related CVEs(same product + same CWE)
Same product
5 shownnpm:happy-dom
Frequently asked(5)
What is CVE-2026-33943?
When was the CVE record for CVE-2026-33943 published?
Is CVE-2026-33943 actively exploited?
What is the CVSS score of CVE-2026-33943?
How do I remediate CVE-2026-33943?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-33943
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