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CVE-2026-25679— Incorrect parsing of IPv6 host literals in net/url

Quick assessment

Affected
Go standard library net/url
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.

Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于url.Parse对主机/授权组件验证不足并接受某些无效URL，导致在net/url中解析IPv6主机字面值错误。

AI Predicted 5.3 Difficulty: Easy EPSS 0.80% · P55

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Go standard library net/url < 1.25.8 affected
1.26.0-0< 1.26.1 affected
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I. Basic Information for CVE-2026-25679

Vulnerability Information
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Vulnerability Title
Incorrect parsing of IPv6 host literals in net/url
Source: CVE Program / CVE List V5
Vulnerability Description
url.Parse insufficiently validated the host/authority component and accepted some invalid URLs.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于url.Parse对主机/授权组件验证不足并接受某些无效URL，导致在net/url中解析IPv6主机字面值错误。
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
Go standard library net/url 0 ~ 1.25.8 -

II. Public POCs for CVE-2026-25679

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III. Intelligence Information for CVE-2026-25679

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Patches & Fixes for CVE-2026-25679 (1)

Vendor Advisories for CVE-2026-25679 (1)

Vendor Pages for CVE-2026-25679 (1)

Other References for CVE-2026-25679 (1)

Same Patch Batch · Go standard library · 2026-03-06 · 5 CVEs total

CVE-2026-27138 Panic in name constraint checking for malformed certificates in crypto/x509
CVE-2026-27137 Incorrect enforcement of email constraints in crypto/x509
CVE-2026-27142 URLs in meta content attribute actions are not escaped in html/template
CVE-2026-27139 FileInfo can escape from a Root in os

IV. Related Vulnerabilities

Same product: net/url
Same vendor: Go standard library

V. Comments for CVE-2026-25679

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