What is CVE-2019-16227?

CVE-2019-16227 is a critical-severity vulnerability in Py-Lmdb Project, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-09-11.

How severe is CVE-2019-16227?

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

Buffer overflow in Py-Lmdb Project

CVE-2019-16227

An issue was discovered in py-lmdb 0.97. For certain values of mn_flags, mdb_cursor_set triggers a memcpy with an invalid write operation within mdb_xcursor_init1. NOTE: this outcome occurs when accessing a data.mdb file supplied by an attacker.

Vulnerability class: Buffer Overflow

Published 2019-09-11 · last modified 2026-06-17.

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: 0.020 (79.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Py-Lmdb Project

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/TeamSeri0us/pocs/tree/master/lmdb/lmdb memcpy illegal dst (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-16227?: CVE-2019-16227 is a critical-severity vulnerability in Py-Lmdb Project, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-09-11.
How severe is CVE-2019-16227?: Critical severity. CVSS v3 base score is 9.8 out of 10.