# CVE-2021-41496: python3-numpy: Buffer overflow in the array_from_pyobj function of fortranobject.c in NumPy < 1.19, which allows attackers to con...

CVE-2021-41496 is fixed in python3-numpy on 1 platform, first by python3-numpy 1:1.17.4-5ubuntu3.1, released December 17, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-41496
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0040
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 17, 2021

## 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)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python3-numpy Ubuntu 20.04 LTS (focal) | 1:1.17.4-5ubuntu3.1 | [python3-numpy 1:1.17.4-5ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-numpy-1-1.17.4-5ubuntu3.1.md) | Dec 17, 2021 |
| Linux | python3-numpy Ubuntu 22.04.1 LTS (jammy) | 1:1.21.5-1ubuntu22.04.1 | [python3-numpy 1:1.21.5-1ubuntu22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-numpy-1-1.21.5-1ubuntu22.04.1.md) | Dec 17, 2021 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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