🛡️ CVE-2026-33937 on npm (Root.io) — handlebars

🔴 CVSS 9.5 — Critical ✅ No Known Exploit OSV
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CVE-2026-33937 in @rootio/handlebars - Patched by Root Root has patched CVE-2026-33937 in the @rootio/handlebars package for Root:npm. Multiple fixed versions available.

Distribution advisory

This page covers CVE-2026-33937 as tracked by npm (Root.io), for the package handlebars. The fix is available in version 4.7.7-root.io.3; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software and timeline

Affected software: @rootio/handlebars (fixed in 4.7.7-root.io.3) and handlebars (fixed in 4.7.7-aikido.3). Published on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

CVE-2026-33937 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-06-17
Updated 2026-08-12
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
@rootio/handlebars — 4.7.7-root.io.3
handlebars — 4.7.7-aikido.3

References

N/A

Exploit Protection

Are you running handlebars?

ROOT-APP-NPM-CVE-2026-33937 carries CVSS 9.5 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

Check My Site For ROOT-APP-NPM-CVE-2026-33937 →

No credit card required  ·  Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

More ROOT APP NPM CVE 2026 advisories

Part of ROOT APP NPM CVE 2026 in the advisory index.