Dottie vulnerable to prototype pollution bypass via non-first path segments in set() and transform()
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.
Summary
Dottie provides nested object access and manipulation in JavaScript. Versions 2.0.4 through 2.0.6 contain an incomplete fix for CVE-2023-26132. The prototype pollution guard introduced in commit `7d3aee1` only validates the first segment of a dot-separated path, allowing an attacker to bypass the protection by placing `__proto__` at any position other than the first. Both `dottie.set()` and `dottie.transform()` are affected. Version 2.0.7 contains an updated fix to address the residual vulnerability.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| mickhansen | dottie.js | 2.0.4 to before 2.0.7 | 2.0.7 | Patch available | CNA |
| — | dottie (npm) | 2.0.4 to before 2.0.7 | 2.0.7 | Patch available | GHSA-r5mx-6wc6-7h9w |
- dottie.js Vendormickhansen Affected 2.0.4 to before 2.0.7 Fixed in 2.0.7 Patch available CNA
- dottie (npm) Vendor— Affected 2.0.4 to before 2.0.7 Fixed in 2.0.7 Patch available GHSA-r5mx-6wc6-7h9w
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:dottie_project:dottie:*:*:*:*:*:node.js:*:* | 2.0.4 to before 2.0.7 | Vulnerable | Dottie Project |
- cpe:2.3:a:dottie_project:dottie:*:*:*:*:*:node.js:*:* Versions 2.0.4 to before 2.0.7 Vulnerable ·Dottie Project
Remediation
- Fix · CNA dottie.js (mickhansen) Fixed in 2.0.7
- Fix · GHSA-r5mx-6wc6-7h9w dottie (npm) Fixed in 2.0.7 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Satellite 6 | Affected | No fix yet |
Not affected: 3 products
- Confidential Compute Attestation
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-27837
- 2026-10-03 Alias added: GHSA-r5mx-6wc6-7h9w
References
Advisory 2
More Dottie Project Dottie vulnerabilities
- TI-2023-11356 Prototype pollution in dottie CVSS 3.1HIGH 7.5
Sources
- CVE-2026-27837 · CVE Program
- CVE-2026-27837 · NVD
- FIRST EPSS
- GHSA-r5mx-6wc6-7h9w · GitHub Advisory Database · CC BY 4.0
- CVE-2026-27837 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences