CVE Catalog

CVE-2026-1858

MediumCVSS 4.8
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.16%

5th percentile - higher than 5% of all known CVEs

Summary

wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If 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.

Risk Assessment

The organization may accept a TLS connection to a server using a certificate issued for a different purpose, weakening server identity verification. This enables impersonation of a trusted server if such a certificate is compromised.

Recommendation

Update wget2 to a version containing the KU/EKU validation fix. Until then, consider restricting wget2 usage to trusted servers.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS