Type Confusion

Handlebars is vulnerable to Type Confusion. The vulnerability is due to unsanitized handling of pre-parsed AST input in Handlebars.compile, which allows an attacker to inject malicious JavaScript via crafted AST nodes and execute arbitrary code...

4coders-commons (>=0.0.1, <=0.0.2), @1delta/aggregators (>=0.1.0, <=0.1.6) +2167 more potentially affected by unknown CVE via handlebars (>=4.6.0, <=4.7.8)

handlebars NPM version =4.6.0, =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, =1.0.0, =0.1.0-alpha.1, =3.1.2, =3.1.6, =0.0.1, =0.1.7 and more Source cves: unknown CVE Source advisory:...

4coders-commons (>=0.0.1, <=0.0.2), @1delta/aggregators (>=0.1.0, <=0.1.6) +2167 more potentially affected by unknown CVE via handlebars (>=4.6.0, <=4.7.8)

handlebars NPM version =4.6.0, =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, =1.0.0, =0.1.0-alpha.1, =3.1.2, =3.1.6, =0.0.1, =0.1.7 and more Source cves: unknown CVE Source advisory: OSV:GHSA-7RX3-28CR-V...

Prototype Pollution

Overview org.webjars.npm:handlebars is an extension to the Mustache templating language. Affected versions of this package are vulnerable to Prototype Pollution in the protoAccessControl function. An attacker can gain unauthorized access to prototype methods by referencing lookupSetter in templat...

Prototype Pollution

Overview handlebars is an extension to the Mustache templating language. Affected versions of this package are vulnerable to Prototype Pollution in the protoAccessControl function. An attacker can gain unauthorized access to prototype methods by referencing lookupSetter in templates through...

Handlebars.js has a Prototype Method Access Control Gap via Missing __lookupSetter__ Blocklist Entry

Summary The prototype method blocklist in lib/handlebars/internal/proto-access.js blocks constructor, defineGetter, defineSetter, and lookupGetter, but omits the symmetric lookupSetter. This omission is only exploitable when the non-default runtime option allowProtoMethodsByDefault: true is...

GHSA-7RX3-28CR-V5WH Handlebars.js has a Prototype Method Access Control Gap via Missing __lookupSetter__ Blocklist Entry

Summary The prototype method blocklist in lib/handlebars/internal/proto-access.js blocks constructor, defineGetter, defineSetter, and lookupGetter, but omits the symmetric lookupSetter. This omission is only exploitable when the non-default runtime option allowProtoMethodsByDefault: true is...

4coders-commons (>=0.0.1, <=0.0.2), @11ty/eleventy (0.3.3) +3670 more potentially affected by unknown CVE 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: unknown CVE Source advisory: OSV:GHSA-442J-39WM-28R2...

Time-of-check Time-of-use (TOCTOU) Race Condition

Overview handlebars is an extension to the Mustache templating language. Affected versions of this package are vulnerable to Time-of-check Time-of-use TOCTOU Race Condition in the lookup function. An attacker can access properties that should be restricted by bypassing prototype-access controls...

Handlebars.js has a Property Access Validation Bypass in container.lookup

Summary In lib/handlebars/runtime.js, the container.lookup function uses container.lookupProperty as a gate check to enforce prototype-access controls, but then discards the validated result and performs a second, unguarded property access depthsiname. This Time-of-Check Time-of-Use TOCTOU patter...

Time-of-check Time-of-use (TOCTOU) Race Condition

Overview org.webjars.npm:handlebars is an extension to the Mustache templating language. Affected versions of this package are vulnerable to Time-of-check Time-of-use TOCTOU Race Condition in the lookup function. An attacker can access properties that should be restricted by bypassing...

4coders-commons (>=0.0.1, <=0.0.2), @11ty/eleventy (0.3.3) +3670 more potentially affected by unknown CVE 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: unknown CVE Source advisory: SNYK:JS-HANDLEBARS-15813000...

GHSA-442J-39WM-28R2 Handlebars.js has a Property Access Validation Bypass in container.lookup

Summary In lib/handlebars/runtime.js, the container.lookup function uses container.lookupProperty as a gate check to enforce prototype-access controls, but then discards the validated result and performs a second, unguarded property access depthsiname. This Time-of-Check Time-of-Use TOCTOU patter...

CVE-2026-33937

A flaw was found in Handlebars. An attacker can exploit this by supplying a crafted Abstract Syntax Tree AST object to the Handlebars.compile function. This allows the injection and execution of arbitrary JavaScript code due to improper sanitization of the value field in NumberLiteral AST nodes...

CVE-2026-33941

A flaw was found in Handlebars. The Handlebars command-line interface CLI precompiler concatenates user-controlled strings, such as template file names and CLI options, directly into the generated JavaScript without proper escaping or sanitization. An attacker capable of influencing these inputs...

CVE-2026-33939

A flaw was found in Handlebars.js. A remote attacker can exploit this by submitting a malformed Handlebars template that includes decorator syntax referencing an unregistered decorator. When the application attempts to compile this template without proper error handling, it triggers an unhandled...

CVE-2026-33916

A flaw was found in Handlebars. The resolvePartial function in the Handlebars runtime does not properly guard against prototype-chain traversal when resolving partial names. This allows an attacker to inject malicious code into web pages. When Object.prototype has been polluted with a string valu...

CVE-2026-33940

A flaw was found in Handlebars.js. A remote attacker can exploit this vulnerability by providing a specially crafted object within the template context. This crafted object, when processed by a dynamic partial lookup, can bypass security checks and be interpreted as malicious code. This allows th...

CVE-2026-33938

A flaw was found in Handlebars. A remote attacker can exploit this vulnerability by manipulating the @partial-block special variable within the template data context. By overwriting @partial-block with a specially crafted Abstract Syntax Tree AST through a helper, a subsequent invocation of...

Linux Distros Unpatched Vulnerability : CVE-2026-33938

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, the @partial-block special variable is stored in...