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CVE-2026-88026

Regular expression injection via unescaped characters in LINQ query translation in MongoDB C# Driver

CVSS 4.0 7.1 HIGHCVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-88026

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-88026

Published

C# Driver

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "MongoDB",
                    "product": "C# Driver",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "2.14.0",
                            "lessThanOrEqual": "3.11.1",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON