CVE-2026-33937

CVE-2026-33937 affects Handlebars.js prior to 4.7.9, where Handlebars.compile() accepts a pre-parsed AST; the NumberLiteral.value is emitted into generated JS without quoting, enabling remote code execution if a crafted AST is supplied. Versions 4.0.0–4.7.8 are vulnerable; 4.7.9 fixes the issue. ...

CVE-2026-33937

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, Handlebars.compile accepts a pre-parsed AST object in addition to a template string. The value field of a NumberLiteral AST node is emitted directly into the generated JavaScript withou...

CVE-2026-33937 Handlebars.js has JavaScript Injection via AST Type Confusion

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, Handlebars.compile accepts a pre-parsed AST object in addition to a template string. The value field of a NumberLiteral AST node is emitted directly into the generated JavaScript withou...

CVE-2026-33937

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, Handlebars.compile accepts a pre-parsed AST object in addition to a template string. The value field of a NumberLiteral AST node is emitted directly into the generated JavaScript withou...

CVE-2026-33937 Handlebars.js has JavaScript Injection via AST Type Confusion

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, Handlebars.compile accepts a pre-parsed AST object in addition to a template string. The value field of a NumberLiteral AST node is emitted directly into the generated JavaScript withou...

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...

CVE-2026-33916

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 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 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...

4coders-commons (>=0.0.1, <=0.0.2), @11ty/eleventy (0.3.3) +3664 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 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 bundle by supplying...

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...

4coders-commons (>=0.0.1, <=0.0.2), @11ty/eleventy (0.3.3) +3664 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: OSV:GHSA-XJPJ-3MR7-GCPF...

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...

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

Summary 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 unresolved partial as a source that needs to be compiled, passing the crafted object to env.compile...

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 the resolvePartial and invokePartial functions. An attacker can execute arbitrary code on th...

4coders-commons (>=0.0.1, <=0.0.2), @11ty/eleventy (0.3.3) +3664 more potentially affected by CVE-2026-33940 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-2026-33940 Source advisory: SNYK:JS-HANDLEBARS-15803086...

GHSA-XHPV-HC6G-R9C6 Handlebars.js has JavaScript Injection via AST Type Confusion when passing an object as dynamic partial

Summary 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 unresolved partial as a source that needs to be compiled, passing the crafted object to env.compile...

4coders-commons (>=0.0.1, <=0.0.2), @11ty/eleventy (0.3.3) +3664 more potentially affected by CVE-2026-33940 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-2026-33940 Source advisory: OSV:GHSA-XHPV-HC6G-R9C6...