Handlebars provides the power necessary to let users build semantic templates. From 3.0.0 until 4.7.10, Handlebars lookupProperty returns Function.prototype.constructor before applying the prototype-access deny list because constructor is an own property of Function.prototype. When an attacker can render a controlled template with allowProtoMethodsByDefault enabled and an accessible function in the template context, the template can traverse from that function through its prototype to Function.prototype and then obtain the Function constructor through the own-property bypass. This permits attacker-controlled JavaScript to execute with the server application's privileges. This issue is fixed in version 4.7.10.
CVE-2026-106445
“—” beside the score: it is equal to the CVSS score beside it.
This critical-severity CVE scores 9.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (48th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-93952 (ENISA EUVD) · GHSA-p8wg-vrv2-v86f (GitHub Security Advisories)Source: ENISA EUVD
- Public exploit or proof-of-concept code is available
A fix is available — apply it.
- CVSS v3
- 9.2
- EG Score
- 9.2CRITICALmedium confidence
- EG Risk
- 72EG Risk 72/100
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)Severity92% × 45%Impact severity (EG Severity): CVSS 9.2 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.Automatability100% × 15%CISA's SSVC Automatable value: yes (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 yes (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
- 48th
- 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 (9.2): severity, escalated by confirmed exploitation. This CVE's 9.2 is its impact severity (EG Severity), not escalated.
- EG Severity
- 9.2 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
- EG Likelihood
- 0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). 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: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: 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 yes (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)3 days if the affected system is publicly exposed; 60 days if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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
October 6, 2026
Last Modified
October 12, 2026
Advisory Details (4)
Auto-updated Oct 6, 2026v4.7.10
Patch available: handlebars-lang/handlebars.js v4.7.10
https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.10commit ceec388abe1d (handlebars-lang/handlebars.js)
Patch available: handlebars-lang/handlebars.js v4.7.10 (contains commit ceec388abe1d)
https://github.com/handlebars-lang/handlebars.js/commit/ceec388abe1d1aac8f6369860d5f390fa71ef4faSecurity improvements
Patch available: handlebars-lang/handlebars.js v4.7.10 (PR #2185 merged 2026-10-05)
https://github.com/handlebars-lang/handlebars.js/pull/2185JavaScript Injection via Own Property Check Bypass · Advisory · handlebars-lang/handlebars.js · GitHub
https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-p8wg-vrv2-v86fVendor Advisories for CVE-2026-106445(4)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:92510Red Hat Product SecurityCritical
Red Hat Security Advisory: RHOAI 3.4.6 - Red Hat OpenShift AI
- RHSA-2026:92307Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.13.14 security update
- RHSA-2026:92303Red Hat Product SecurityHigh
Red Hat Security Advisory: multicluster engine for Kubernetes v2.8.12 security update
- GHSA-p8wg-vrv2-v86fGitHub Security AdvisoriesCritical
Handlebars: JavaScript Injection via Own Property Check Bypass
Patch Availability(4)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | multicluster-engine/console-mce-rhel9:1792886718 | 2026-10-29 | redhat |
| redhat | rhacm2/console-rhel9:1792883111 | 2026-10-29 | redhat |
| redhat | rhoai/odh-mod-arch-model-registry-rhel9:1793001827 | 2026-10-29 | redhat |
| npm | handlebars @ 4.7.10 (fixes >= 3.0.0, <= 4.7.9) | — | ghsa |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(4 across 4 ecosystems)
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-handlebars | 3:4.7.10-1 ... 3:4.7.9-6 (8 versions) |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-handlebars | 3:4.7.10-1 ... 3:4.7.9-6 (8 versions) |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-handlebars | 3:4.7.7+~4.1.0-1 ... 3:4.7.9-6 (7 versions) |
| — |
npm(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| handlebars | — |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 20× in last 7d / 69× 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.
- 2026-11-02 02:49 UTCEG score recompute
- 2026-11-02 02:49 UTCVendor advisory
- 2026-11-02 02:49 UTCGHSA enrichmentGHSA-p8wg-vrv2-v86f · GitHub severity CRITICAL
- 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-01 08:00 UTCGHSA enrichmentGHSA-p8wg-vrv2-v86f · GitHub severity CRITICAL
- 2026-11-01 04:33 UTCEG score recompute
- 2026-11-01 04:33 UTCVendor advisory
- 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-31 06:17 UTCEG score recompute
- 2026-10-31 06:17 UTCVendor advisory
- 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-30 08:02 UTCEG score recompute
- 2026-10-30 08:02 UTCVendor advisory
- 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-29 09:47 UTCEG score recompute
- 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-28 11:30 UTCEG score recompute
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-27 04:17 UTCEG score recompute
- 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-26 01:37 UTCEG score recompute
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-25 14:54 UTCEG score recompute
- 2026-10-25 03:18 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
Show 44 moreShow fewer
- 2026-10-24 05:03 UTCEG score recompute
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-23 06:46 UTCEG score recompute
- 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-22 08:28 UTCEG score recompute
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-21 10:12 UTCEG score recompute
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
- 2026-10-19 19:12 UTCEG score recompute
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-18 20:53 UTCEG score recompute
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-18 05:08 UTCEG score recompute
- 2026-10-17 22:36 UTCEG score recompute
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-17 00:19 UTCEG score recompute
- 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-15 23:46 UTCEG score recompute
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-14 15:25 UTCEG score recompute
- 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-12 16:34 UTCEG score recompute
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-12 15:27 UTCEG score recompute
- 2026-10-12 14:40 UTCEG score recompute
- 2026-10-11 20:14 UTCEG score recompute
- 2026-10-11 17:26 UTCEG score recompute
- 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-11 13:42 UTCEG score recompute
- 2026-10-10 22:43 UTCEG score recompute
- 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-09 20:55 UTCEG score recompute
- 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-09 05:59 UTCEG score recompute
- 2026-10-09 02:18 UTCEG score recompute
- 2026-10-09 01:59 UTCEG score recompute
- 2026-10-08 20:03 UTCEG score recompute
- 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-08 01:28 UTCEG score recompute
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
- 2026-10-06 20:32 UTCEG score recompute
- 2026-10-06 19:52 UTCEG score recomputeFirst assessed: 9.2 CRITICAL
- 2026-10-06 19:51 UTCMITRE cvelistV5first tracked
Publicly available exploits
(1 reference)Public exploit code is referenced for this CVE (1 GitHub PoC). Defenders should treat patch urgency accordingly.
- GitHub PoCmurrez/CVE-2026-106445Published Oct 10, 2026
CVE-2026-106445 — Handlebars 4.0.0–4.7.9 RCE via Function.prototype.constructor bypass (GHSA-p8wg-vrv2-v86f). PoCbit PoC + Docker lab (4.7.9), check/exploit HTTP client, GHSA template chain. Fixed 4.7.10. https://pocbit.org/pocs/cve-2026-106445
Open source ↗
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:12:node-handlebars
Same vendor
10 shownredhat:RHSA-2026:92303 · redhat:RHSA-2026:92510 · redhat:RHSA-2026:92307
Frequently asked(5)
What is CVE-2026-106445?
When was the CVE record for CVE-2026-106445 published?
Is CVE-2026-106445 actively exploited?
What is the CVSS score of CVE-2026-106445?
How do I remediate CVE-2026-106445?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-106445
Is Your Infrastructure Affected by CVE-2026-106445?
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