Medium severity4.0NVD Advisory· Published Jul 21, 2026· Updated Jul 23, 2026

CVE-2026-16266

Description

Versions of the package mongo-object before 3.0.3 are vulnerable to Prototype Pollution via the expandKey() function in util.js. An attacker can modify the JavaScript prototype chain by supplying a crafted property path containing special keys such as __proto__.

Affected products

Longshotlabs/mongo-objectllm-fuzzy
Range: <3.0.3

Patches

Vulnerability mechanics

References

github.com/longshotlabs/mongo-object/blob/4f7a570f2a2fcfa9417b7870d5f859e9574ec73c/src/util.ts%23L251nvd
github.com/longshotlabs/mongo-object/commit/638314107d8b397e5453c28e41729522b3e8d67cnvd
github.com/longshotlabs/mongo-object/issues/27nvd
security.snyk.io/vuln/SNYK-JS-MONGOOBJECT-13816714nvd

News mentions

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cvss	0.260
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000