CVE-2026-93395Integer Underflow → Heap Out-of-Bounds Read in `bson_new_from_buffer()
Updated under an hour ago ()
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It affects MongoDB Inc. C Driver. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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A missing lower-bound validation in the bson_new_from_buffer() function of libbson allows an integer underflow when processing BSON data with a zero-length prefix. The function reads a 32-bit document length from the input buffer but does not verify that the value is at least 5 (the minimum valid BSON document size) before using it in an array index calculation. When the length field is zero, the expression used to check the document's null terminator wraps to UINT32_MAX, causing a heap out-of-bounds read that crashes the process. An unauthorized party who can supply crafted BSON input to an application using this API can cause a denial of service.
- CVSS
- 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-191
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mongodb
- NVD analysis
- Analyzed
- Record last updated
- Sep 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
MongoDB Inc. C Driver mongodb:c_driver (from the name) | from 2.0.0 before 2.3.1 | CNA record |
mongodb c_driver mongodb:c_driver | from 2.0.0 before 2.3.1 | NVD |
References
- https://jira.mongodb.org/browse/CDRIVER-6343permissions-required
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.