CVE-2026-42334: Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment

Q: How do I fix CVE-2026-42334?

mongoose: upgrade to 6.13.9, 7.8.9, 8.22.1, 9.1.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-42334 being exploited?

CVE-2026-42334 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42334 affect?

CVE-2026-42334 affects mongoose. Severity is high (CVSS 7.5). 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 oper

Q: How urgent is CVE-2026-42334?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2026-42334 is a high-severity flaw (CVSS 7.5) affecting mongoose. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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. B

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-74
Published	2026-05-14
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: mongoosejs

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-14 18:16 UTCPublished CVE record published
2026-10-26 14:10 UTCUpdated Record last modified

mongoosejs mongoose UPGRADE

Affected: < 6.13.9 · >= 7.0.0 and < 7.8.9 · >= 8.0.0 and < 8.22.1 · >= 9.0.0 and < 9.1.6

Fixed in: 6.13.9, 7.8.9, 8.22.1, 9.1.6

Safe to downgrade to: a release before 7.0.0

1. Check installed version

npm ls mongoose

2. UPGRADE to 6.13.9

npm install mongoose@">=6.13.9"

3. If no update is available yet, DOWNGRADE to a release before 7.0.0

npm view mongoose versions npm install mongoose@"<7.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42334?

mongoose: upgrade to 6.13.9, 7.8.9, 8.22.1, 9.1.6. Exact commands for each OS are on this page.

Is CVE-2026-42334 being exploited?

CVE-2026-42334 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42334 affect?

CVE-2026-42334 affects mongoose. Severity is high (CVSS 7.5). 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 oper

How urgent is CVE-2026-42334?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Software pages

MongoDB vulnerabilities

References

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