CVE catalog

CVE-2026-106446

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

[CVE catalog]

Severity: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Oct 6, 2026, 7:41:55 PM UTC
Updated: Oct 6, 2026, 8:17:26 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.79% · Oct 27, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	node-handlebars	sid	`3:4.7.10-1`	fixed
Debian	node-handlebars	forky	`3:4.7.10-1`	fixed
Debian	node-handlebars	trixie	`3:4.7.7+~4.1.0-1`	vulnerable
Debian	node-handlebars	bookworm	`3:4.7.7+~4.1.0-1`	vulnerable
Npm	handlebars	Not reported	`4.7.10`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	node-handlebars	source	sid	`3:4.7.10-1`	not yet assigned	Not reported	[1150246]
Debian	node-handlebars	source	forky	`3:4.7.10-1`	not yet assigned	Not reported	[1150246]
Debian	node-handlebars	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1150246]
Debian	node-handlebars	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1150246]
Npm	handlebars	npm	Not reported	`4.7.10`	Not reported	GHSA-8R5X-FM3F-WHWJ	Not reported

[Debian bug #1150246]

Notes

[trixie] node-handlebars: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[handlebars]Affected
Source package: [node-handlebars]
Details (2)
- 3:4.7.7+~4.1.0-1 · all · bookworm
  Affected
  nvd · node-handlebars · debian · bookworm; nvd · node-handlebars · debian · 12
- 3:4.7.7+~4.1.0-1 · all · bookworm
  Affected
  nvd · node-handlebars · debian · bookworm; nvd · node-handlebars · debian · 12
[libjs-handlebars]Affected
Source package: [node-handlebars]
Details (2)
- 3:4.7.7+~4.1.0-1 · all · bookworm
  Affected
  nvd · node-handlebars · debian · bookworm; nvd · node-handlebars · debian · 12
- 3:4.7.7+~4.1.0-1 · all · bookworm
  Affected
  nvd · node-handlebars · debian · bookworm; nvd · node-handlebars · debian · 12
[libjs-handlebars.runtime]Affected
Source package: [node-handlebars]
Details (2)
- 3:4.7.7+~4.1.0-1 · all · bookworm
  Affected
  nvd · node-handlebars · debian · bookworm; nvd · node-handlebars · debian · 12
- 3:4.7.7+~4.1.0-1 · all · bookworm
  Affected
  nvd · node-handlebars · debian · bookworm; nvd · node-handlebars · debian · 12

[Debian 13 (Trixie)]

[handlebars]Affected
Source package: [node-handlebars]
Details (2)
- 3:4.7.7+~4.1.0-1 · all · trixie
  Affected
  nvd · node-handlebars · debian · 13
- 3:4.7.7+~4.1.0-1 · all · trixie
  Affected
  nvd · node-handlebars · debian · 13
[libjs-handlebars]Affected
Source package: [node-handlebars]
Details (2)
- 3:4.7.7+~4.1.0-1 · all · trixie
  Affected
  nvd · node-handlebars · debian · 13
- 3:4.7.7+~4.1.0-1 · all · trixie
  Affected
  nvd · node-handlebars · debian · 13
[libjs-handlebars.runtime]Affected
Source package: [node-handlebars]
Details (2)
- 3:4.7.7+~4.1.0-1 · all · trixie
  Affected
  nvd · node-handlebars · debian · 13
- 3:4.7.7+~4.1.0-1 · all · trixie
  Affected
  nvd · node-handlebars · debian · 13

Observed: Oct 23, 2026, 7:40:21 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]