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CVE-2019-16227

32
FAUCET Score

CVE-2019-16227 is a critical vulnerability affecting py-lmdb 0.97, where a specially crafted data.mdb file can trigger an invalid write operation via mdb_cursor_set, leading to a memcpy error within mdb_xcursor_init1. This vulnerability carries a CVSS score of 9.8 (CRITICAL), indicating a network-exploitable flaw with low attack complexity that can result in complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation, no public exploit code (Metasploit, Nuclei, ExploitDB), and it is not listed on the KEV catalog, the vulnerability has garnered significant community discussion with 10 mentions, suggesting awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.97CPE matchmatch criteria
cpe:2.3:a:py-lmdb_project:py-lmdb:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.96%
Probability of exploitation in next 30 days
EPSS Percentile
78.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0196 is in the 67th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

pipGHSA-pf3p-v9xp-mrvfcritical

py-lmdb Invalid write operation

May 24, 2022

References

github.com / TeamSeri0us/pocs/tree/master/lmdb/lmdb%20memcpy%20illegal%20dst
ExploitThird Party Advisory