Prototype Pollution in handlebars
Priority LOW 38CWE-1321Published · Updated
Key facts
- Attack vector
- —
- Privileges required
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- User interaction
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- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
Versions of `handlebars` prior to 3.0.8 or 4.5.3 are vulnerable to prototype pollution. It is possible to add or modify properties to the Object prototype through a malicious template. This may allow attackers to crash the application or execute Arbitrary Code in specific conditions. ## Recommendation Upgrade to version 3.0.8, 4.5.3 or later.
Why it matters now
Fix Fixed handlebars (npm): 3.0.8, 4.5.3
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | handlebars (npm) | before 3.0.8 | 3.0.8 | Patch available | GHSA-g9r4-xpmj-mj65 |
| — | handlebars (npm) | 4.0.0 to before 4.5.3 | 4.5.3 | Patch available | GHSA-g9r4-xpmj-mj65 |
- handlebars (npm) Vendor— Affected before 3.0.8 Fixed in 3.0.8 Patch available GHSA-g9r4-xpmj-mj65
- handlebars (npm) Vendor— Affected 4.0.0 to before 4.5.3 Fixed in 4.5.3 Patch available GHSA-g9r4-xpmj-mj65
Remediation
- Fix · GHSA-g9r4-xpmj-mj65 handlebars (npm) Fixed in 3.0.8 Advisory →
- Fix · GHSA-g9r4-xpmj-mj65 handlebars (npm) Fixed in 4.5.3 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-g9r4-xpmj-mj65
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences