CVE-2026-33941 Handlebars.js has JavaScript Injection in CLI Precompiler via Unescaped Names and Options

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, the Handlebars CLI precompiler bin/handlebars / lib/precompiler.js concatenates user-controlled strings — template file names and several CLI options — directly into the JavaScript it...

CVE-2026-33941

The CVE-2026-33941 issue affects the Handlebars CLI precompiler (bin/handlebars, lib/precompiler.js) from versions 4.0.0–4.7.8, where user-controlled template filenames and CLI options are concatenated into the emitted JavaScript without escaping. An attacker who can influence filenames or argume...

CVE-2026-33941

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, the Handlebars CLI precompiler bin/handlebars / lib/precompiler.js concatenates user-controlled strings — template file names and several CLI options — directly into the JavaScript it...

CVE-2026-33940 Handlebars.js has JavaScript Injection via AST Type Confusion when passing an object as dynamic partial

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, a crafted object placed in the template context can bypass all conditional guards in resolvePartial and cause invokePartial to return undefined. The Handlebars runtime then treats the...

CVE-2026-33939

Summary: CVE-2026-33939 affects Handlebars 4.0.0–4.7.8, where a template using decorator syntax referencing an unregistered decorator (e.g. {{*n}}) causes the runtime to call an undefined value as a function, leading to an unhandled TypeError and a potential single-request DoS. The issue is fixed...

CVE-2026-33939 Handlebars.js has Denial of Service via Malformed Decorator Syntax in Template Compilation

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, when a Handlebars template contains decorator syntax referencing an unregistered decorator e.g. n, the compiled template calls lookupPropertydecorators, "n", which returns undefined. Th...

CVE-2026-33939 Handlebars.js has Denial of Service via Malformed Decorator Syntax in Template Compilation

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, when a Handlebars template contains decorator syntax referencing an unregistered decorator e.g. n, the compiled template calls lookupPropertydecorators, "n", which returns undefined. Th...

CVE-2026-33939 Handlebars.js has Denial of Service via Malformed Decorator Syntax in Template Compilation

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, when a Handlebars template contains decorator syntax referencing an unregistered decorator e.g. n, the compiled template calls lookupPropertydecorators, "n", which returns undefined. Th...

CVE-2026-33916 Handlebars.js has Prototype Pollution Leading to XSS through Partial Template Injection

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, resolvePartial in the Handlebars runtime resolves partial names via a plain property lookup on options.partials without guarding against prototype-chain traversal. When Object.prototype...

CVE-2026-33916

Handlebars.js CVE-2026-33916 affects 4.0.0–4.7.8 where resolvePartial() looks up partials via options.partials without guarding prototype traversal. If Object.prototype is polluted with a string key matching a partial, that string becomes the partial body and is rendered unescaped, enabling refle...

4coders-commons (>=0.0.1, <=0.0.2), @11ty/eleventy (0.3.3) +3662 more potentially affected by CVE-2026-33941 via handlebars (>=4.0.0, <=4.7.8)

handlebars NPM version =4.0.0, =0.0.1, =0.1.0, =0.1.0, =0.0.11, =0.0.52, =0.1.0, =0.0.72, =0.1.0, =1.1.1-pr-7-1d68cf28da, =0.0.0-13d458778df8db161111e788ed4207a13a110724, =1.16.0, =1.16.0, =1.16.0, =2.4.4 and more Source cves: CVE-2026-33941 Source advisory: SNYK:JS-HANDLEBARS-15807040...

Handlebars.js has JavaScript Injection in CLI Precompiler via Unescaped Names and Options

Summary The Handlebars CLI precompiler bin/handlebars / lib/precompiler.js concatenates user-controlled strings — template file names and several CLI options — directly into the JavaScript it emits, without any escaping or sanitization. An attacker who can influence template filenames or CLI...

Improper Encoding or Escaping of Output

Overview org.webjars.npm:handlebars is an extension to the Mustache templating language. Affected versions of this package are vulnerable to Improper Encoding or Escaping of Output through the CLI precompiler in lib/precompiler.js. An attacker can execute arbitrary JavaScript in the generated...

GHSA-XJPJ-3MR7-GCPF Handlebars.js has JavaScript Injection in CLI Precompiler via Unescaped Names and Options

Summary The Handlebars CLI precompiler bin/handlebars / lib/precompiler.js concatenates user-controlled strings — template file names and several CLI options — directly into the JavaScript it emits, without any escaping or sanitization. An attacker who can influence template filenames or CLI...

GHSA-9CX6-37PM-9JFF Handlebars.js has Denial of Service via Malformed Decorator Syntax in Template Compilation

Summary When a Handlebars template contains decorator syntax referencing an unregistered decorator e.g. n, the compiled template calls lookupPropertydecorators, "n", which returns undefined. The runtime then immediately invokes the result as a function, causing an unhandled TypeError: ... is not ...

Improper Check for Unusual or Exceptional Conditions

Overview org.webjars.npm:handlebars is an extension to the Mustache templating language. Affected versions of this package are vulnerable to Improper Check for Unusual or Exceptional Conditions through the registerDecorator path in lib/handlebars/compiler/javascript-compiler.js. An attacker can...

EUVD-2026-16858

Handlebars.js has Denial of Service via Malformed Decorator Syntax in Template Compilation...

Handlebars.js has Denial of Service via Malformed Decorator Syntax in Template Compilation

Summary When a Handlebars template contains decorator syntax referencing an unregistered decorator e.g. n, the compiled template calls lookupPropertydecorators, "n", which returns undefined. The runtime then immediately invokes the result as a function, causing an unhandled TypeError: ... is not ...

Access of Resource Using Incompatible Type ('Type Confusion')

Overview org.webjars.npm:handlebars is an extension to the Mustache templating language. Affected versions of this package are vulnerable to Access of Resource Using Incompatible Type 'Type Confusion' via manipulation of the @partial-block variable in the template data context. An attacker can...

4coders-commons (>=0.0.1, <=0.0.2), @11ty/eleventy (0.3.3) +3662 more potentially affected by CVE-2026-33938 via handlebars (>=4.0.0, <=4.7.8)

handlebars NPM version =4.0.0, =0.0.1, =0.1.0, =0.1.0, =0.0.11, =0.0.52, =0.1.0, =0.0.72, =0.1.0, =1.1.1-pr-7-1d68cf28da, =0.0.0-13d458778df8db161111e788ed4207a13a110724, =1.16.0, =1.16.0, =1.16.0, =2.4.4 and more Source cves: CVE-2026-33938 Source advisory: SNYK:JS-HANDLEBARS-15803082...