CVE-2026-106446 Handlebars - Server-Side Template Injection

Handlebars 4.0.0 to < 4.7.10 contains a server-side template injection caused by insufficient AST validation in Handlebars.compile() and Handlebars.precompile(), letting attackers execute arbitrary code by supplying crafted AST objects, exploit requires attacker to supply an object instead of a template string.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.64% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Server-Side Template Injection
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
6 October 2026
Updated
15 October 2026
Weakness
CWE-94

Vendor fix

Upgrade to version 4.7.10 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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