CVE-2026-106438 (GCVE-0-2026-106438)

Vulnerability from cvelistv5 – Published: 2026-10-08 18:44 – Updated: 2026-10-08 19:21
VLAI
Title
Silent Decimal128 value corruption via incorrect exactness check in MongoDB C Driver
Summary
An incorrect calculation in Decimal128 string parsing in the MongoDB C Driver can accept certain over-precision inputs containing leading zeros instead of rejecting them. This produces a value different from the supplied text. An actor who can provide a decimal string to an embedding application, including through Extended JSON parsing, can cause the application to store or use an incorrect numeric value.
Severity
5.1 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
4 (Medium)
CVSS:3.1/AV:L/AC:L/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 2026-10-08 19:20 UTC
CWE
Assigner
mongodb CNA under the mitre root
CNA scorecard C 70/100 over 200 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
MongoDB C Driver Affected: 1.4.0 , < 1.30.13 (semver)
Affected: 2.0.0 , < 2.5.6 (semver)
guessed Create a notification for this product.
Show details on NVD website
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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