Handlebars.js has JavaScript Injection via AST Type Confusion by tampering @partial-block

🗓️ 27 Mar 2026 18:20:44Reported by GitHub Advisory DatabaseType

Handlebars vulnerability: helpers overwrite @partial-block in data, causing dynamic compile of attacker AST and server-side execution.

Reporter	Title	Published	Views	Family All 49
IBM Security Bulletins	Security Bulletin: IBM App Connect Enterprise Certified Container operands are vulnerable to arbitrary code execution (CVE-2026-33937, CVE-2026-33938, CVE-2026-33940, CVE-2026-33941) and denial of service (CVE-2026-33939)	7 May 202613:34	–	ibm
IBM Security Bulletins	Security Bulletin: Multiple security vulnerabilities in IBM Business Automation Manager Open Editions	24 Apr 202617:45	–	ibm
IBM Security Bulletins	Security Bulletin: IBM App Connect Enterprise is vulnerable to multiple vulnerabilities due to multiple node modules.	24 Apr 202614:07	–	ibm
IBM Security Bulletins	Security Bulletin: Platform Navigator and Automation Assets in IBM Cloud Pak for Integration are vulnerable to multiple vulnerabilities in Handlebars	5 May 202609:18	–	ibm
ATTACKERKB	CVE-2026-33938	27 Mar 202621:05	–	attackerkb
Information Security Automation	April Linux Patch Wednesday	22 Apr 202616:00	–	avleonov
Chainguard	CVE-2026-33938 vulnerabilities	30 Mar 202619:17	–	cgr
Circl	CVE-2026-33938	27 Mar 202618:20	–	circl
CNNVD	Handlebars.js 安全漏洞	27 Mar 202600:00	–	cnnvd
CVE	CVE-2026-33938	27 Mar 202621:05	–	cve

Vulners

Node

handlebars handlebarsRange4.0.0–4.7.8npm

Source	Link
github	www.github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-3mfm-83xf-c92r
github	www.github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2
github	www.github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9
nvd	www.nvd.nist.gov/vuln/detail/CVE-2026-33938
github	www.github.com/advisories/GHSA-3mfm-83xf-c92r

27 Mar 2026 21:52Current

6.2Medium risk

Vulners AI Score6.2

CVSS 3.18.1

EPSS0.00048

SSVC