Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-1858— wget2 Improper Certificate Validation

Quick assessment

Affected
gnu wget2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

wget2是美国GNU社区的一个支持高性能并发下载与现代协议特性的网络文件获取工具。 wget2存在输入验证错误漏洞，该漏洞源于接受具有不正确密钥用途或扩展密钥用途的服务器证书，可能允许攻击者重用为不同目的颁发的证书进行TLS服务器身份验证。

CVSS 4.8 · Medium EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
gnu wget2 ≤ 2.2.1 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-1858

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
wget2 Improper Certificate Validation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
wget2 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wget2是美国GNU社区的一个支持高性能并发下载与现代协议特性的网络文件获取工具。 wget2存在输入验证错误漏洞，该漏洞源于接受具有不正确密钥用途或扩展密钥用途的服务器证书，可能允许攻击者重用为不同目的颁发的证书进行TLS服务器身份验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gnu wget2 0 ~ 2.2.1 -

II. Public POCs for CVE-2026-1858

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-1858

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-1858 (1)

IV. Related Vulnerabilities

Same vendor: gnu
Same weakness: CWE-20

V. Comments for CVE-2026-1858

No comments yet

Leave a comment