CVE-2026-106445

CRITICALPre-NVD 9.29.2
EchelonGraph scoreMEDIUM confidence

“—” 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.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — Patch released this weekElevated

Also known asEUVD-2026-93952 (ENISA EUVD) · GHSA-p8wg-vrv2-v86f (GitHub Security Advisories)Source: ENISA EUVD

9.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.2Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
9.2
EG Score
9.2CRITICALmedium confidence
EG Risk
72
EG 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, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
GitHub release Patch Available

v4.7.10

Patch available: handlebars-lang/handlebars.js v4.7.10

https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.10
GitHub commit Patch Available

commit 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/ceec388abe1d1aac8f6369860d5f390fa71ef4fa
GitHub pull request Patch Available

Security improvements

Patch available: handlebars-lang/handlebars.js v4.7.10 (PR #2185 merged 2026-10-05)

https://github.com/handlebars-lang/handlebars.js/pull/2185
GitHub advisoryMentions a patch (unverified)

JavaScript Injection via Own Property Check Bypass · Advisory · handlebars-lang/handlebars.js · GitHub

https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-p8wg-vrv2-v86f

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatmulticluster-engine/console-mce-rhel9:17928867182026-10-29redhat
redhatrhacm2/console-rhel9:17928831112026-10-29redhat
redhatrhoai/odh-mod-arch-model-registry-rhel9:17930018272026-10-29redhat
npmhandlebars @ 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)
PackageVulnerable rangeFix by version rangeDependents
node-handlebars3:4.7.10-1 ... 3:4.7.9-6 (8 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
node-handlebars3:4.7.10-1 ... 3:4.7.9-6 (8 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
node-handlebars3:4.7.7+~4.1.0-1 ... 3:4.7.9-6 (7 versions)
  • every version up to 3:4.7.10-1: fixed in 3:4.7.10-1
—
npm(1)
PackageVulnerable rangeFix by version rangeDependents
handlebars—
  • 4.0.0 up to 4.7.10: fixed in 4.7.10
—

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.

  1. 2026-11-02 02:49 UTCEG score recompute
  2. 2026-11-02 02:49 UTCVendor advisory
  3. 2026-11-02 02:49 UTCGHSA enrichmentGHSA-p8wg-vrv2-v86f · GitHub severity CRITICAL
  4. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  5. 2026-11-01 08:00 UTCGHSA enrichmentGHSA-p8wg-vrv2-v86f · GitHub severity CRITICAL
  6. 2026-11-01 04:33 UTCEG score recompute
  7. 2026-11-01 04:33 UTCVendor advisory
  8. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  9. 2026-10-31 06:17 UTCEG score recompute
  10. 2026-10-31 06:17 UTCVendor advisory
  11. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  12. 2026-10-30 08:02 UTCEG score recompute
  13. 2026-10-30 08:02 UTCVendor advisory
  14. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  15. 2026-10-29 09:47 UTCEG score recompute
  16. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  17. 2026-10-28 11:30 UTCEG score recompute
  18. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  19. 2026-10-27 04:17 UTCEG score recompute
  20. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  21. 2026-10-26 01:37 UTCEG score recompute
  22. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  23. 2026-10-25 14:54 UTCEG score recompute
  24. 2026-10-25 03:18 UTCEG score recompute
  25. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
Show 44 more
  1. 2026-10-24 05:03 UTCEG score recompute
  2. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  3. 2026-10-23 06:46 UTCEG score recompute
  4. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  5. 2026-10-22 08:28 UTCEG score recompute
  6. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  7. 2026-10-21 10:12 UTCEG score recompute
  8. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  9. 2026-10-19 19:12 UTCEG score recompute
  10. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  11. 2026-10-18 20:53 UTCEG score recompute
  12. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  13. 2026-10-18 05:08 UTCEG score recompute
  14. 2026-10-17 22:36 UTCEG score recompute
  15. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  16. 2026-10-17 00:19 UTCEG score recompute
  17. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  18. 2026-10-15 23:46 UTCEG score recompute
  19. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  20. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  21. 2026-10-14 15:25 UTCEG score recompute
  22. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  23. 2026-10-12 16:34 UTCEG score recompute
  24. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  25. 2026-10-12 15:27 UTCEG score recompute
  26. 2026-10-12 14:40 UTCEG score recompute
  27. 2026-10-11 20:14 UTCEG score recompute
  28. 2026-10-11 17:26 UTCEG score recompute
  29. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  30. 2026-10-11 13:42 UTCEG score recompute
  31. 2026-10-10 22:43 UTCEG score recompute
  32. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  33. 2026-10-09 20:55 UTCEG score recompute
  34. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  35. 2026-10-09 05:59 UTCEG score recompute
  36. 2026-10-09 02:18 UTCEG score recompute
  37. 2026-10-09 01:59 UTCEG score recompute
  38. 2026-10-08 20:03 UTCEG score recompute
  39. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  40. 2026-10-08 01:28 UTCEG score recompute
  41. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  42. 2026-10-06 20:32 UTCEG score recompute
  43. 2026-10-06 19:52 UTCEG score recomputeFirst assessed: 9.2 CRITICAL
  44. 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-2026-106445
    Published 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 ↗

Frequently asked(5)

What is CVE-2026-106445?
CVE-2026-106445 is a critical-severity vulnerability; its CVE record was published on October 6, 2026. 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…
When was the CVE record for CVE-2026-106445 published?
The CVE record for CVE-2026-106445 was published on October 6, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 12, 2026; the record at its source may have been updated since.
Is CVE-2026-106445 actively exploited?
CVE-2026-106445 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-106445?
CVE-2026-106445 has a CVSS base score of 9.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-106445?
A fix for CVE-2026-106445 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-106445 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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