What is CVE-2025-40906?

CVE-2025-40906 is a critical-severity vulnerability in Mongodb Bson::xs, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-05-16.

How severe is CVE-2025-40906?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-40906 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Mongodb Bson::xs

CVE-2025-40906

BSON::XS versions 0.8.4 and earlier for Perl includes a bundled libbson 1.1.7, which has several vulnerabilities. Those include CVE-2017-14227, CVE-2018-16790, CVE-2023-0437, CVE-2024-6381, CVE-2024-6383, and CVE-2025-0755. BSON-XS was…

Vulnerability class: Buffer Overflow

EPSS: 0.005 (41.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mongodb Bson::xs — versions 0

Weakness classification (CWE)

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

9b29abf9-4ab0-4765-b253-1875cd9b441e (mailing-list)
9b29abf9-4ab0-4765-b253-1875cd9b441e (vendor-advisory)

Frequently asked questions

What is CVE-2025-40906?: CVE-2025-40906 is a critical-severity vulnerability in Mongodb Bson::xs, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-05-16.
How severe is CVE-2025-40906?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-40906 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.