Critical severity · published Feb 26, 2026
CVE-2026-27837
Dottie vulnerable to prototype pollution bypass via non-first path segments in set() and transform()
9.8
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DO
dottie.js · mickhansen
>= 2.0.4, < 2.0.7 · source: vendor
DO
Dottie · Dottie Project
2.0.4 before 2.0.7 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27837
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-27837
Not Applicable
https://github.com/advisories/GHSA-4gxf-g5gf-22h4
Patch
https://github.com/mickhansen/dottie.js/commit/7e8fa1345a4b46325f0eab8d7aeb1c4deaefdb14
Exploit
https://github.com/mickhansen/dottie.js/security/advisories/GHSA-r5mx-6wc6-7h9w