How severe is CVE-2026-88026?

CVE-2026-88026 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-88026 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-88026?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-88026 published?

CVE-2026-88026 was published on 2026-09-10.

CVE-2026-88026

CVE-2026-88026 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. 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-943.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-943
Published: 2026-09-10
Last modified: 2026-09-10

Description

Improper neutralization of regular-expression metacharacters in the LINQ query translation component of the MongoDB C# Driver can cause a caller-supplied character sequence to alter a regular-expression predicate generated by an affected application. An authenticated user who can influence such a value may cause the application to return records beyond those intended by the original filter.

Frequently asked questions

What is CVE-2026-88026?: Improper neutralization of regular-expression metacharacters in the LINQ query translation component of the MongoDB C# Driver can cause a caller-supplied character sequence to alter a regular-expression predicate generated by an affected application. An authenticated user who can influence such a value may cause the application to return records beyond those intended by the original filter.
How severe is CVE-2026-88026?: CVE-2026-88026 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-88026 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-88026?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-88026 published?: CVE-2026-88026 was published on 2026-09-10.

References

https://jira.mongodb.org/browse/CSHARP-6177

Other CWE-943 vulnerabilities

CVE-2026-40141 — Critical (CVSS 9.9): A high-severity vulnerability exists in a web application component of BeyondTrust Remote Support and Privileged Remote…
CVE-2024-4872 — Critical (CVSS 9.9): A vulnerability exists in the query validation of the MicroSCADA Pro/X SYS600 product. If exploited this could allow an…
CVE-2026-77070 — Critical (CVSS 9.8): n8n before 1.123.69, 2.33.4, and 2.34.1 contains a NoSQL injection vulnerability in the MongoDB node's Find, Delete,…
CVE-2026-41274 — Critical (CVSS 9.8): Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, the…
CVE-2026-40351 — Critical (CVSS 9.8): FastGPT is an AI Agent building platform. In versions prior to 4.14.9.5, the password-based login endpoint uses…
CVE-2026-32248 — Critical (CVSS 9.8): Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to…

Browse all CWE-943 vulnerabilities →