Is there a public exploit for CVE-2026-120954?

No public exploit for CVE-2026-120954 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-120954?

CVE-2026-120954 scores CVSS 6.3 (v4.0), rated medium.

What does CVE-2026-120954 affect?

CVE-2026-120954 affects MONGODB C Driver.

6.3 Medium

A weakness in the BSON library's handling of a specialized binary vector data type allows an arithmetic wraparound when computing the…

CVE-2026-120954

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.

Assessment

CVSS: 6.3 (v4.0)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 3 November 2026
Last updated: 3 November 2026
Affected: MONGODB · C Driver
Assigner: mongodb

CVSS vectorCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

https://jira.mongodb.org/browse/CDRIVER-6420

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