CVE-2021-41496
No exploitation reported by the sources we read.
- Published2021-12-17
- Fixed in1.19.0 · 1.19
- WeaknessCWE-120
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
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)
Timeline
dates in UTC- 2021-12-1720:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-41496?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-41496?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.19 | < 1.19.0 | 1.19.0 | NVD · OSV |
| 1.19 | < 1.19 | 1.19 | OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
numpy: buffer overflow in the array_from_pyobj() in fortranobject.c
numpy-f2py as a component of Red Hat Enterprise Linux 6 · numpy.src as a component of Red Hat Enterprise Linux 6 · numpy-f2py as a component of Red Hat Enterprise Linux 7 · +24 more
Red Hat Security Advisory: Red Hat OpenStack Platform 16.1 (numpy) security update
Red Hat Security Advisory: Red Hat OpenStack Platform 16.2 (numpy) security update
Fix
- Update Numpy to 1.19.0 · 1.19
- Vendor fix Red Hat Product Security RHSA-2022:0987 · 27 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
- No fix planned, says the vendor Red Hat Product Security CVE-2021-41496 · 6 productsOut of support scope
- No fix planned, says the vendor Red Hat Product Security CVE-2021-41496 · 21 productsWill not fix
Advisories and patches
- github.comPatch
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.15.5read 2026-10-23
- NVDCVSS 2.02.1read 2026-10-23
- NVDweakness (CWE)CWE-120read 2026-10-23
- FIRST EPSSEPSS score0.4 %2026-10-23
- OSVaffected packages—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Published
- 2021-12-17
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-41496?
Is CVE-2021-41496 actively exploited?
What is the CVSS score for CVE-2021-41496?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.