Bug 2528086 (CVE-2026-84971)

Summary: CVE-2026-84971 MONGOCRYPT: MONGOCRYPT: Denial of Service via improper handling of encrypted data
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 MONGOCRYPT. Improper handling of an unexpected value size in the decryption path of the client-side encryption library can lead to a failed internal check. A remote attacker, by placing a specially crafted encrypted value or controlling application responses, could exploit this to terminate the process using the library, resulting in a Denial of Service (DoS).
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: 2542401, 2542402, 2542403, 2542404, 2542405, 2542407, 2542409    
Bug Blocks:    

Description OSIDB Bzimport 2026-09-03 15:32:04 UTC
Improper handling of an unexpected value size in the decryption path of a client-side encryption library can cause a failed internal check that terminates the process using the library. A party able to place a suitably formed encrypted value where an application will decrypt it, or able to control the responses the application receives, may cause that application to stop running.