Buffer Copy without Checking Size of Input in NumPy

published 2021-12-17 4 y ago modified 2026-06-17 4 mo ago also GHSA-f7c7-j99h-c22f , PYSEC-2021-857 , EUVD-2021-0153

cvss: 5.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits: 0; none known

Buffer overflow in the array_from_pyobj function of fortranobject.c in NumPy < 1.19, which allows attackers to conduct a Denial of Service attacks by carefully constructing an array with negative values. NOTE: The vendor does not agree this is a vulnerability; the negative dimensions can only be created by an already privileged user (or internally)

Patch / fix

fixed in 2 distros 5 links 1

pypi numpy 1.19, 1.19.0
numpy numpy 1.19.0

ubuntu red hat suse opensuse azure linux

numpy Ubuntu 20.04 LTS 1:1.17.4-5ubuntu3.1
numpy Ubuntu 22.04 LTS 1:1.21.5-1ubuntu22.04.1

ubuntu advisories UBUNTU-CVE-2021-41496

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

numpy openstack 16.2, openstack 16.1 1:1.17.0-8.el8ost
python3-numpy openstack 16.2, openstack 16.1 1:1.17.0-8.el8ost
python3-numpy-f2py openstack 16.2, openstack 16.1 1:1.17.0-8.el8ost

red hat advisories RHSA-2022:0987 RHSA-2022:1000

python-numpy SLES 15 SP2-BCL, SLES 15 SP1-BCL, SLE Real Time 15 SP2 +18 more 1.17.3-10.1
python-numpy_1_17_3-gnu-hpc SLE Real Time 15 SP2, SLE Module for HPC 15 SP3, SLE High Performance Computing 15-ESPOS +5 more 1.17.3-10.1
python2-numpy SLE Module for Python 2 15 SP3, SLE High Performance Computing 15 SP2-ESPOS, Manager Server 4.1 +6 more 1.16.5-150200.3.5.1
python-numpy_1_16_5-gnu-hpc SLE Module for HPC 15 SP3, SLE High Performance Computing 15 SP2-ESPOS, openSUSE Leap 15.4 +1 more 1.16.5-150200.3.5.1
python2-numpy SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 1.16.5-150000.1.9.1
python-numpy_1_16_5-gnu-hpc SLE High Performance Computing 15-LTSS, SLE High Performance Computing 15-ESPOS, SLE High Performance Computing 15 SP1-LTSS +1 more 1.16.5-150000.1.9.1
python-numpy_1_13_3-gnu-hpc SLE Module for HPC 12 1.13.3-4.12.1
python-numpy SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.8.0-5.11.1

suse advisories SUSE-SU-2022:0134-3 SUSE-SU-2022:0134-2 SUSE-SU-2022:0134-1 SUSE-SU-2022:1064-2 SUSE-SU-2022:1064-1 SUSE-SU-2022:2441-1

python-numpy openSUSE Tumbleweed 2.4.6-1.1
python-numpy1 openSUSE Tumbleweed 1.26.4-1.1
python-numpy openSUSE Tumbleweed 1.25.2-2.1
python-numpy openSUSE Leap 15.3 1.17.3-10.1
dxflib Package Hub 15 SP3, openSUSE Leap 15.3 3.17.0-bp153.2.3.1
python-numpy_1_17_3-gnu-hpc openSUSE Leap 15.3 1.17.3-10.1
python2-numpy openSUSE Leap 15.3 1.16.5-150200.3.5.1
python-numpy_1_16_5-gnu-hpc openSUSE Leap 15.3 1.16.5-150200.3.5.1

opensuse advisories openSUSE-SU-2026:11371-1 openSUSE-SU-2024:14311-1 openSUSE-SU-2024:13220-1 openSUSE-SU-2022:0134-1 openSUSE-SU-2022:1064-1

numpy CBL-Mariner 2.0 1.22.0-1

azure linux advisories AZL-7056

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

github.com/numpy/numpy/issues/19000 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-41496 updated 2026-01-13 cvss 5.5

numpy: buffer overflow in the array_from_pyobj() in fortranobject.c

Red Hat Enterprise Linux 6 numpy, numpy-f2py Red Hat Enterprise Linux 7 numpy, numpy-f2py
affected: no fix planned “Out of support scope”
Red Hat Enterprise Linux 8 numpy, python3-numpy, python3-numpy-f2py
affected: no fix planned “Will not fix”
Red Hat OpenStack Platform 13 (Queens) python2-numpy, python2-numpy-f2py
affected: no fix planned “Out of support scope”
Red Hat Software Collections python27-numpy, python27-numpy-f2py, rh-python38-python-numpy, rh-python38-python-numpy-f2py
affected: no fix planned “Will not fix”
Red Hat OpenStack Platform 16.1 numpy 1.17.0-8.el8ost, python3-numpy 1.17.0-8.el8ost, python3-numpy-f2py 1.17.0-8.el8ost
fixed: vendor fix RHSA-2022:0987
Red Hat OpenStack Platform 16.2 numpy 1.17.0-8.el8ost, python3-numpy 1.17.0-8.el8ost, python3-numpy-f2py 1.17.0-8.el8ost
fixed: vendor fix RHSA-2022:1000
Red Hat Enterprise Linux 9 python3-numpy, python3-numpy-f2py
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/numpy/numpy/issues/19000 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	2.1	AV:L/AC:L/Au:N/C:N/I:N/A:P
GitHub	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
pypi	numpy	<1.19 <1.19.0	1.19 1.19.0

Classification

Weakness

CWE-120 Buffer Copy without Checking Size of Input

References

github.com /numpy/numpy/issues/19000
web, exploit, issue-tracking, patch, third-party-advisory, report
oracle.com /security-alerts/cpujul2022.html
web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2021-41496
advisory
github.com /numpy/numpy
package
github.com /advisories/GHSA-f7c7-j99h-c22f
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary