CVE-2026-1858: wget2 Improper Certificate Validation

Q: What is the severity of CVE-2026-1858?

CVE-2026-1858 is considered a medium severity vulnerability due to improper certificate validation in wget2.

Q: How do I fix CVE-2026-1858?

To fix CVE-2026-1858, ensure you update wget2 to the latest version where the vulnerability has been patched.

Q: What are the implications of CVE-2026-1858?

The implications of CVE-2026-1858 include risks of accepting maliciously manipulated certificates for TLS server authentication.

Q: Which software is affected by CVE-2026-1858?

CVE-2026-1858 affects the GNU wget2 software.

Q: How can attackers exploit CVE-2026-1858?

Attackers can exploit CVE-2026-1858 by using a compromised certificate with incorrect Key Usage or Extended Key Usage for TLS server authentication.

Published Apr 29, 2026

Updated

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.

Affected Software

2 affected components

GNU Wget2

GNU Wget2<=2.2.1

Event History

Apr 29, 2026

CVE Published

via MITRE·08:15 PM

Data Sourced

via MITRE·08:15 PM

DescriptionSeverityWeakness

Data Sourced

via NVD·09:16 PM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-1858?

CVE-2026-1858 is considered a medium severity vulnerability due to improper certificate validation in wget2.

How do I fix CVE-2026-1858?

To fix CVE-2026-1858, ensure you update wget2 to the latest version where the vulnerability has been patched.

What are the implications of CVE-2026-1858?

The implications of CVE-2026-1858 include risks of accepting maliciously manipulated certificates for TLS server authentication.

Which software is affected by CVE-2026-1858?

CVE-2026-1858 affects the GNU wget2 software.

How can attackers exploit CVE-2026-1858?

Attackers can exploit CVE-2026-1858 by using a compromised certificate with incorrect Key Usage or Extended Key Usage for TLS server authentication.

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