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 the official Perl XS implementation of MongoDB's BSON serialization, but this distribution has reached its end of life as of August 13, 2020 and is no longer supported.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.006 (49.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000
Affected products
- MongoDB Bson::xs — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
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.