DEBIAN-CVE-2026-33938

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Source
https://security-tracker.debian.org/tracker/CVE-2026-33938
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33938.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-33938
Upstream
Published
2026-03-27T21:17:27.587Z
Modified
2026-04-03T06:00:09.598122Z
Severity
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

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 the template data context and is reachable and mutable from within a template via helpers that accept arbitrary objects. When a helper overwrites @partial-block with a crafted Handlebars AST, a subsequent invocation of {{> @partial-block}} compiles and executes that AST, enabling arbitrary JavaScript execution on the server. Version 4.7.9 fixes the issue. Some workarounds are available. First, use the runtime-only build (require('handlebars/runtime')). The compile() method is absent, eliminating the vulnerable fallback path. Second, audit registered helpers for any that write arbitrary values to context objects. Helpers should treat context data as read-only. Third, avoid registering helpers from third-party packages (such as handlebars-helpers) in contexts where templates or context data can be influenced by untrusted input.

References

Affected packages

Debian:11 / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/debian/node-handlebars?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.7.6+~4.1.0-2
3:4.7.6+~4.1.0-3
3:4.7.7+~4.1.0-1
3:4.7.9-1
3:4.7.9-2
3:4.7.9-3
3:4.7.9-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33938.json"

Debian:12 / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/debian/node-handlebars?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.7.7+~4.1.0-1
3:4.7.9-1
3:4.7.9-2
3:4.7.9-3
3:4.7.9-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33938.json"

Debian:13 / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/debian/node-handlebars?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3:4.*
3:4.7.7+~4.1.0-1
3:4.7.9-1
3:4.7.9-2
3:4.7.9-3
3:4.7.9-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33938.json"

Debian:14 / node-handlebars

Package

Name
node-handlebars
Purl
pkg:deb/debian/node-handlebars?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3:4.7.9-1

Affected versions

3:4.*
3:4.7.7+~4.1.0-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33938.json"