Bug 2548189 (CVE-2026-106438)

Summary: CVE-2026-106438 mongo-c-driver: mongo-c-driver: Incorrect numeric calculation via over-precision Decimal128 string parsing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the MongoDB C Driver. This vulnerability allows an attacker to compromise data integrity by causing an application to store or process incorrect numeric values. Due to a calculation error during Decimal128 string parsing, the driver accepts certain over-precision numbers with leading zeros instead of rejecting them. An attacker who can supply decimal strings to an application, such as through Extended JavaScript Object Notation (JSON) parsing, can trigger this issue to produce numeric values different from the supplied text.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2548589, 2548590    
Bug Blocks:    

Description OSIDB Bzimport 2026-10-08 19:04:50 UTC 
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.