How severe is CVE-2026-93761?

CVE-2026-93761 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 none, integrity none, and availability high.

Is CVE-2026-93761 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-93761?

CVE-2026-93761 primarily affects Mongodb Mongoid. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-93761?

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.

When was CVE-2026-93761 published?

CVE-2026-93761 was published on 2026-09-18 and last updated on 2026-09-24.

CVE-2026-93761

CVE-2026-93761 is a high-severity vulnerability in Mongodb Mongoid 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-1333.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1333
Affected product: Mongodb Mongoid
Published: 2026-09-18
Last modified: 2026-09-24

Description

An inefficient regular expression complexity issue in the in-memory query evaluation component of the Mongoid library may allow an unauthenticated party to cause excessive processing within an embedding application process. Applications that place user-supplied text into a pattern-matching query condition on an embedded association may become unresponsive.

Frequently asked questions

What is CVE-2026-93761?: An inefficient regular expression complexity issue in the in-memory query evaluation component of the Mongoid library may allow an unauthenticated party to cause excessive processing within an embedding application process. Applications that place user-supplied text into a pattern-matching query condition on an embedded association may become unresponsive.
How severe is CVE-2026-93761?: CVE-2026-93761 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 none, integrity none, and availability high.
Is CVE-2026-93761 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-93761?: CVE-2026-93761 primarily affects Mongodb Mongoid. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-93761?: 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.
When was CVE-2026-93761 published?: CVE-2026-93761 was published on 2026-09-18 and last updated on 2026-09-24.

References

https://jira.mongodb.org/browse/MONGOID-5981

Affected products (2)

cpe:2.3:a:mongodb:mongoid:*:*:*:*:*:*:*:*
cpe:2.3:a:mongodb:mongoid:9.1.0:*:*:*:*:*:*:*

More vulnerabilities in Mongodb Mongoid

CVE-2026-93762 — Critical (CVSS 9.8): Mongoid contains an unsafe reflection weakness in the query path used for embedded documents. An application that…
CVE-2026-93765 — Critical (CVSS 9.1): Mongoid contains an unsafe reflection weakness in the document persistence layer of its object-document mapping code.…
CVE-2026-93759 — High (CVSS 8.6): Mongoid does not neutralize a string-typed query criterion supplied to its query builder, and instead passes it to the…
CVE-2026-93760 — High (CVSS 8.2): Mongoid does not restrict which query operators may come from caller-supplied filter data when an application hands…
CVE-2026-93758 — High (CVSS 8.1): An insecure direct object reference in the nested attributes handling of the Mongoid object-document mapper may allow a…
CVE-2026-93764 — Medium (CVSS 6.5): Mongoid may omit encryption rules for fields declared on embedded models when generating the client-side field-level…

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CVE-2023-29487 — Critical (CVSS 9.1): An issue was discovered in Heimdal Thor agent versions 3.4.2 and before on Windows and 2.6.9 and before on macOS,…
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