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  4. CVE 2026 106446 handlebars javascript injection via ast type
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Back to active CVEs
Critical · CVSS 9.8CVE-2026-106446

Handlebars: JavaScript Injection via AST Type Confusion in compile (Program.blockParams)CVE-2026-106446

Answer in brief

CVE-2026-106446 records a Critical severity (CVSS 9.8) vulnerability in Handlebars: JavaScript Injection via AST Type Confusion in compile (Program.blockParams). The current sources do not mark it as known exploited. The current feed maps handlebars-lang/handlebars.js (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 6, 2026Updated Oct 6, 2026Source checked Oct 7, 2026First seen by HOL Oct 6, 2026Material review Oct 6, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps handlebars-lang/handlebars.js (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
handlebars-lang/handlebars.jsgeneric>=4.0.0 <4.7.104.7.10

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for handlebars-lang/handlebars.js.
  2. 2Review the reported fix. Update handlebars-lang/handlebars.js to 4.7.10 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 6, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Handlebars provides the power necessary to let users build semantic templates. From 4.0.0 until 4.7.10, Handlebars.compile() and Handlebars.precompile() accept pre-parsed AST objects while validating only selected PathExpression, NumberLiteral, and BooleanLiteral values. This issue bypasses the AST validation introduced in version 4.7.9 for CVE-2026-33937. An attacker who can supply an object instead of a template string can place JavaScript expressions in unchecked values such as Program.blockParams.length, a non-PathExpression parameter depth, a non-string StringLiteral.value, or a non-string PathExpression.original. The compiler emits those values into generated JavaScript, causing code execution in the server process when compile output renders or wherever precompile output is loaded. Applications that pass only template strings are not affected. This issue is fixed in version 4.7.10.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Langflow OSS is affected by multiple vulnerabilitiesAlso CWE-94
  • Backstage: Improper validation of MkDocs theme configuration in TechDocsAlso CWE-94
  • Langflow OSS is affected by multiple vulnerabilitiesAlso CWE-94
  • Langflow OSS is affected by multiple vulnerabilitiesAlso CWE-94
  • Langflow OSS is affected by multiple vulnerabilitiesAlso CWE-94
  • Langflow OSS is affected by multiple vulnerabilitiesAlso CWE-94

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-94, CWE-843
Source
CVE List V5
Source checked
Oct 7, 2026
References
4 linked sources
Open source record