The MongoDB C Driver's Cyrus SASL integration performs unsafe string copying during username canonicalization, enabling a heap buffer overflow before any authentication or network traffic. This may be triggered by passing untrusted input in the username of a MongoDB URI with authMechanism=GSSAPI.
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Affected Vendors & Products
References
| Link | Providers |
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| https://jira.mongodb.org/browse/CDRIVER-6134 |
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History
Wed, 06 May 2026 16:15:00 +0000
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ssvc
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Wed, 06 May 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
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| Description | The MongoDB C Driver's Cyrus SASL integration performs unsafe string copying during username canonicalization, enabling a heap buffer overflow before any authentication or network traffic. This may be triggered by passing untrusted input in the username of a MongoDB URI with authMechanism=GSSAPI. | |
| Title | MongoDB C Driver Cyrus SASL Canonicalization Buffer Overflow | |
| Weaknesses | CWE-120 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: mongodb
Published: 2026-05-06T15:08:23.671Z
Updated: 2026-05-07T03:55:47.410Z
Reserved: 2026-04-20T16:17:41.724Z
Link: CVE-2026-6691
Updated: 2026-05-06T15:24:26.254Z
Status : Received
Published: 2026-05-06T16:16:11.483
Modified: 2026-05-06T16:16:11.483
Link: CVE-2026-6691
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