How severe is CVE-2026-81523?

CVE-2026-81523 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-81523 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-81523?

CVE-2026-81523 affects Mongodb Libmongocrypt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-81523?

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

When was CVE-2026-81523 published?

CVE-2026-81523 was published on 2026-08-27 and last updated on 2026-09-17.

CVE-2026-81523

CVE-2026-81523 is a medium-severity vulnerability in Mongodb Libmongocrypt with a CVSS 3.x base score of 4.4. 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: Medium (CVSS 3.x base score 4.4)
CVSS v4: 2.0
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Mongodb Libmongocrypt
Published: 2026-08-27
Last modified: 2026-09-17

Description

A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.

Frequently asked questions

What is CVE-2026-81523?: A missing input-validation issue in MongoDB libmongocrypt's automatic-encryption context setup allows a caller-supplied database identifier to be accepted without sanitization. The resulting impact is limited to incorrect schema selection, which may lead to limited disclosure or modification of information handled by the application.
How severe is CVE-2026-81523?: CVE-2026-81523 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-81523 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-81523?: CVE-2026-81523 affects Mongodb Libmongocrypt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-81523?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-81523 published?: CVE-2026-81523 was published on 2026-08-27 and last updated on 2026-09-17.

References

Affected products (1)

cpe:2.3:a:mongodb:libmongocrypt:*:*:*:*:*:*:*:*

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