What is CVE-2026-1858?

CVE-2026-1858 is a medium-severity vulnerability in Gnu Wget2, classified under Improper Input Validation. CVSS score: 4.8/10. Published 2026-04-29.

How severe is CVE-2026-1858?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Improper input validation in Gnu Wget2

CVE-2026-1858

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…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.000 (1.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Gnu Wget2 — versions 0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

vulnreport@tenable.com (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-1858?: CVE-2026-1858 is a medium-severity vulnerability in Gnu Wget2, classified under Improper Input Validation. CVSS score: 4.8/10. Published 2026-04-29.
How severe is CVE-2026-1858?: Medium severity. CVSS v3 base score is 4.8 out of 10.