# CVE-2026-1858

> Vulnerability · severity: **MEDIUM** (CVSS 4.8).

## Description

wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.

## Key facts

- **CVE ID:** CVE-2026-1858
- **Published:** 2026-04-29
- **CVSS severity:** MEDIUM
- **CVSS base score:** 4.8
- **CWE codes:** CWE-20

## Affected products

- `gnu:wget2`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1858

## Citation

> AI Analytics. CVE-2026-1858. Retrieved 2026-07-19 from https://api.ai-analytics.org/cve/CVE-2026-1858. Derived from NIST NVD. Licensed CC0.

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