Buffer overflow in the array_from_pyobj function of fortranobject.c in NumPy < 1.19…
Priority LOW 25CWE-120Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 2 fixed, 5 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-120 and the CVSS impact.
Summary
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)
Why it matters now
EPSS 0.00396 34th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial numpy (PyPI): 1.19Red Hat: 2 advisoriesRed Hat: 2 fixed, 5 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | numpy (PyPI) | before 1.19 | 1.19 | Patch available | GHSA-f7c7-j99h-c22f |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- numpy (PyPI) Vendor— Affected before 1.19 Fixed in 1.19 Patch available GHSA-f7c7-j99h-c22f
Remediation
- Fix · GHSA-f7c7-j99h-c22f numpy (PyPI) Fixed in 1.19 Advisory →
Red Hat 2 advisories
- RHSA-2022:0987 Released 2022-03-24 · Red Hat rating ModerateRed Hat OpenStack Platform 16.1 (numpy) security update
- Red Hat OpenStack Platform 16.1 numpy-1:1.17.0-8.el8ost, python3-numpy-1:1.17.0-8.el8ost, python3-numpy-f2py-1:1.17.0-8.el8ost
- RHSA-2022:1000 Released 2022-03-23 · Red Hat rating ModerateRed Hat OpenStack Platform 16.2 (numpy) security update
- Red Hat OpenStack Platform 16.2 numpy-1:1.17.0-8.el8ost, python3-numpy-1:1.17.0-8.el8ost, python3-numpy-f2py-1:1.17.0-8.el8ost
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 13 (Queens) | Affected | No fix planned: Out of support scope |
| Red Hat Software Collections | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 16.1 | Fixed | RHSA-2022:0987 |
| Red Hat OpenStack Platform 16.2 | Fixed | RHSA-2022:1000 |
Not affected: 1 product
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2021-41496
- 2026-10-03 Alias added: GHSA-f7c7-j99h-c22f
References
More Numpy vulnerabilities
- TI-2019-04516 An issue was discovered in NumPy before 1.16.3. CVSS 3.0CRITICAL 9.8
- TI-2017-09516 The numpy.pad function in Numpy 1.13.1 and older versions is missing input validation. CVSS 3.0HIGH 7.5
- TI-2021-13284 An incomplete string comparison in the numpy.core component in NumPy before 1.22.0 allows… CVSS 3.1MEDIUM 5.3
- TI-2021-18253 Null Pointer Dereference vulnerability exists in numpy.sort in NumPy < and 1.19 in the… CVSS 3.1MEDIUM 5.3
- TI-2021-12844 A Buffer Overflow vulnerability exists in NumPy 1.9.x in the PyArray_NewFromDescr_int… CVSS 3.1MEDIUM 5.3
- TI-2014-01452 (1) core/tests/test_memmap.py, (2) core/tests/test_multiarray.py, (3) f2py/f2py2e.py, and… CVSS 3.0MEDIUM 5.5
Sources
- CVE-2021-41496 · CVE Program
- CVE-2021-41496 · NVD
- FIRST EPSS
- GHSA-f7c7-j99h-c22f · GitHub Advisory Database · CC BY 4.0
- CVE-2021-41496 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences