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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-106446)

ID	Name	Product	Family	Type	Severity
474008	Echo: handlebars: security update to 4.7.10	Tenable Cloud Security	Echo Local Security Checks	Local	critical
474008	Echo: handlebars: security update to 4.7.10	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	critical
473857	SCA: security update for handlebars (GHSA-8r5x-fm3f-whwj)	Tenable Cloud Security	SCA Checks	Local	critical
473857	SCA: security update for handlebars (GHSA-8r5x-fm3f-whwj)	Tenable Self-Hosted Container Security	SCA Checks	Local	critical

Detections

Analytics

CVE-2026-106446

critical

Tenable Plugins

critical

critical

critical

critical