CVE-2026-84962: CWE-93 in MongoDB libmongocrypt
Description
An unauthorized user with key vault write access may cause an authorized client to issue arbitrary authenticated Google Cloud KMS API calls under the authorized user's identity, escalating database-level access into cloud key control and defeating client-side encryption.
CVSS v4.0
Score 5.7medium
Affected software
MongoDB
libmongocrypt
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-84962 is a vulnerability in MongoDB's libmongocrypt library where an unauthorized user who has write access to the key vault can manipulate an authorized client to perform arbitrary authenticated Google Cloud KMS API calls as the authorized user. This effectively escalates privileges from database-level access to control over cloud keys, undermining client-side encryption security. The vulnerability is classified under CWE-93, indicating improper neutralization of CRLF sequences in HTTP headers. The issue affects MongoDB's cloud service environment, and a patch is available to address the flaw.
Potential Impact
An attacker with key vault write access can escalate their privileges by causing an authorized client to make arbitrary authenticated calls to Google Cloud KMS APIs under the authorized user's identity. This compromises cloud key control and defeats client-side encryption, potentially exposing sensitive encrypted data.
Mitigation Recommendations
A patch is available for this vulnerability. Since this affects a cloud-hosted service, the vendor (MongoDB) manages remediation server-side. Users should consult the official MongoDB advisory for confirmation and ensure their service is updated to the patched version.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-09-02T17:58:52.742Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Is Cloud Service
- true
Threat ID: 6a9990d2acd9273b491c1d6b
Added to database: 09/03/2026, 15:22:58 UTC
Last enriched: 09/07/2026, 13:04:30 UTC
Last updated: 10/17/2026, 06:48:21 UTC
Views: 44
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