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CVE-2019-16227

py-lmdb Invalid write operation

9.8 CriticalFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

2.04%Up 1.6 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 9.8

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.

Record
CVE-2019-16227
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-787
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2019-16227
Updated
2026-11-02
EUVDEUVD-2019-0080 No score

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.

Record
EUVD-2019-0080
Updated
2026-11-03
GitHub AdvisoriesGHSA-pf3p-v9xp-mrvf 9.3

py-lmdb Invalid write operation

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.

Record
GHSA-pf3p-v9xp-mrvf
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-787
Updated
2026-11-02
OSV 9.8

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.

Record
CVE-2019-16227
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2019-16227 9.8

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.

Record
DEBIAN-CVE-2019-16227
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 4 moreShow less
OSVGHSA-pf3p-v9xp-mrvf 9.3

py-lmdb Invalid write operation

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.

Record
GHSA-pf3p-v9xp-mrvf
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-787
Updated
2026-11-02
OSVUBUNTU-CVE-2019-16227 9.8

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.

Record
UBUNTU-CVE-2019-16227
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2026:10430-1 No score

python311-lmdb-2.1.1-1.1 on GA media

These are all security issues fixed in the python311-lmdb-2.1.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10430-1
Updated
2026-11-02
OSVPYSEC-2019-239 No score

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.

Record
PYSEC-2019-239
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
lmdb
PyPI
 through 0.97 None known
lmdb
Debian:12
 All versions, plus listed versions
0.9.24-10.9.31-10.9.35-1
 None known
lmdb
Debian:13
 All versions, plus listed versions
0.9.31-10.9.35-1
 None known
lmdb
Debian:14
 All versions, plus listed versions
0.9.31-10.9.35-1
 None known
py-lmdb
Debian:12
 All versions, plus listed versions
1.4.0-11.4.1-11.4.1-21.4.1-3
 None known
py-lmdb
Debian:13
 All versions, plus listed versions
1.4.1-3
 None known
py-lmdb
Debian:14
 All versions, plus listed versions
1.4.1-3
 None known
lmdb
PyPI
 through 0.97, plus listed versions
0.580.590.600.610.62
Show 32 moreShow less
0.630.640.650.660.670.680.690.700.710.730.740.750.760.770.780.790.800.810.820.830.840.850.860.870.880.890.910.920.930.940.950.96
 None known
lmdb
PyPI
 before 0.98, plus listed versions
0.580.590.600.610.62
Show 33 moreShow less
0.630.640.650.660.670.680.690.700.710.730.740.750.760.770.780.790.800.810.820.830.840.850.860.870.880.890.910.920.930.940.950.960.97
0.98
py-lmdb
Ubuntu:16.04:LTS
 All versions, plus listed versions
0.86-1build10.86-1build2
 None known
Show 8 moreShow less
Affected packages
PackageAffectedFixed
py-lmdb
Ubuntu:18.04:LTS
 All versions, plus listed versions
0.86-1build4
 None known
py-lmdb
Ubuntu:20.04:LTS
 All versions, plus listed versions
0.86-1.10.86-1.1build10.86-1.20.86-1.2build1
 None known
py-lmdb
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.0.0-1build11.0.0-1build21.0.0-1build3
 None known
py-lmdb
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.4.1-21.4.1-2build11.4.1-2build2
 None known
py-lmdb
Ubuntu:25.10
 All versions, plus listed versions
1.4.1-3build2
 None known
py-lmdb
Ubuntu:26.10
 All versions, plus listed versions
1.4.1-3build4
 None known
py-lmdb
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.4.1-3build21.4.1-3build31.4.1-3build4
 None known
python-lmdb
openSUSE:Tumbleweed
From an advisory covering 5 CVEs
 before 2.1.1-1.1
2.1.1-1.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-16227 is a critical vulnerability (CVSS 9.8) in Py-lmdb Project Py-lmdb, published September 11, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.04%, the 81st percentile. Fixed in lmdb 0.98.

References

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