How severe is CVE-2026-42334?

CVE-2026-42334 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-42334 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42334?

CVE-2026-42334 affects Mongoosejs Mongoose. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42334?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-42334 have an EU (EUVD) identifier?

Yes. CVE-2026-42334 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30349.

When was CVE-2026-42334 published?

CVE-2026-42334 was published on 2026-05-14 and last updated on 2026-06-17.

CVE-2026-42334

CVE-2026-42334 is a high-severity vulnerability in Mongoosejs Mongoose with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30349
Weakness: CWE-74
Affected product: Mongoosejs Mongoose
Published: 2026-05-14
Last modified: 2026-06-17

Description

Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.9, 7.8.9, 8.22.1, and 9.1.6, a vulnerability allows bypassing Mongoose’s sanitizeFilter query sanitization mechanism via the $nor operator. When sanitizeFilter is enabled, Mongoose wraps query operators in $eq to neutralize them. However, prior to the fix, $nor was not included in the set of logical operators that are recursively sanitized. Because $nor accepts an array (like $and and $or), and arrays do not trigger hasDollarKeys(), malicious operators such as $ne, $gt, or $regex could be injected inside a $nor clause without being sanitized. This vulnerability is fixed in 6.13.9, 7.8.9, 8.22.1, and 9.1.6.

Frequently asked questions

What is CVE-2026-42334?: Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.9, 7.8.9, 8.22.1, and 9.1.6, a vulnerability allows bypassing Mongoose’s sanitizeFilter query sanitization mechanism via the $nor operator. When sanitizeFilter is enabled, Mongoose wraps query operators in $eq to neutralize them. However, prior to the fix, $nor was not included in the set of logical operators that are recursively sanitized. Because $nor accepts an array (like $and and $or), and arrays do not trigger hasDollarKeys(), malicious operators such as $ne, $gt, or $regex could be injected inside a $nor clause without being sanitized. This vulnerability is fixed in 6.13.9, 7.8.9, 8.22.1, and 9.1.6.
How severe is CVE-2026-42334?: CVE-2026-42334 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-42334 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42334?: CVE-2026-42334 affects Mongoosejs Mongoose. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42334?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-42334 have an EU (EUVD) identifier?: Yes. CVE-2026-42334 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30349.
When was CVE-2026-42334 published?: CVE-2026-42334 was published on 2026-05-14 and last updated on 2026-06-17.

References

https://github.com/Automattic/mongoose/security/advisories/GHSA-wpg9-53fq-2r8h

Affected products (1)

cpe:2.3:a:mongoosejs:mongoose:*:*:*:*:*:node.js:*:*

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