How severe is CVE-2026-81526?

CVE-2026-81526 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 none, integrity high, and availability none.

Is CVE-2026-81526 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-81526?

CVE-2026-81526 affects Mongodb Rust Driver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-81526?

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

When was CVE-2026-81526 published?

CVE-2026-81526 was published on 2026-08-27 and last updated on 2026-09-29.

CVE-2026-81526

CVE-2026-81526 is a medium-severity vulnerability in Mongodb Rust Driver 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-74.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Mongodb Rust Driver
Published: 2026-08-27
Last modified: 2026-09-29

Description

The MongoDB Rust Driver does not neutralize special characters in a caller-supplied target identifier before embedding it in the request it sends to the server. An actor able to influence that identifier in an application using the driver may cause write operations to be applied to an unintended target within the same deployment using the application's own credentials. This may result in unauthorized modification of data belonging to another logical boundary enforced by the application.

Frequently asked questions

What is CVE-2026-81526?: The MongoDB Rust Driver does not neutralize special characters in a caller-supplied target identifier before embedding it in the request it sends to the server. An actor able to influence that identifier in an application using the driver may cause write operations to be applied to an unintended target within the same deployment using the application's own credentials. This may result in unauthorized modification of data belonging to another logical boundary enforced by the application.
How severe is CVE-2026-81526?: CVE-2026-81526 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 none, integrity high, and availability none.
Is CVE-2026-81526 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-81526?: CVE-2026-81526 affects Mongodb Rust Driver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-81526?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-81526 published?: CVE-2026-81526 was published on 2026-08-27 and last updated on 2026-09-29.

References

Affected products (1)

cpe:2.3:a:mongodb:rust_driver:*:*:*:*:*:mongodb:*:*

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