CVE-2026-120954 (GCVE-0-2026-120954)

Vulnerability from cvelistv5 – Published: 2026-11-03 18:45 – Updated: 2026-11-03 19:42
VLAI
Title
Silent element-count truncation via 32-bit bit-length overflow in packed-bit vector views
Summary
A weakness in the BSON library's handling of a specialized binary vector data type allows an arithmetic wraparound when computing the number of elements described by an oversized attacker-supplied value. On builds where the platform word size is 32 bits, an application that parses untrusted BSON data can be made to process only a small fraction of the supplied elements while the operation reports success, producing results that disagree with byte-oriented accessors and with 64-bit builds of the same library. No authentication or user interaction is required beyond getting the application to parse the data. The impact is limited to data integrity; memory safety is not affected and no information is disclosed.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-03 19:42 UTC
CWE
  • CWE-190 - Integer Overflow or Wraparound
Assigner
mongodb CNA under the mitre root
CNA scorecard C 70/100 over 235 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
MongoDB C Driver Affected: 2.0.0 , ≤ 2.5.7 (semver)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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