Vulnerability details
CVE-2026-26021
ahdinosaur set-in
Prototype pollution in set-in
CVSS 4.0
9.4Critical
Official description
set-in provides the set value of nested associative structure given array of keys. A prototype pollution vulnerability exists in the the npm package set-in (>=2.0.1, < 2.0.5). Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using Array.prototype. This has been fixed in version 2.0.5.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.4Critical | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| ahdinosaur | set-in | >= 2.0.1, < 2.0.5 | CVEProject cvelistV5 (CNA) |
References and advisories
2
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Details
- Published
- 2026-02-12
- Last updated
- 2026-02-13
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.55%
Probability of exploitation in 30 days
46.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')