What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-06 · updated 2026-09-18
• Weakness: CWE-425

Description

url.Parse insufficiently validated the host/authority component and accepted some invalid URLs.

Affected products

• Go: before 1.25.8; 1.26.0 — fixed in 1.25.8
• Go Stdlib: before 1.25.8; from 1.26.0-0 before 1.26.1 — fixed in 1.25.8, 1.26.1

How to fix

Upgrade to a fixed version: Go 1.25.8; Go Stdlib 1.25.8, 1.26.1. Check the vendor advisory for mitigations.

References

• https://go.dev/cl/752180
• https://go.dev/issue/77578
• https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk
• https://pkg.go.dev/vuln/GO-2026-4601
• https://access.redhat.com/errata/RHSA-2026:10065
• https://access.redhat.com/errata/RHSA-2026:10125
• https://access.redhat.com/errata/RHSA-2026:10133
• https://access.redhat.com/errata/RHSA-2026:10140
• https://access.redhat.com/errata/RHSA-2026:10141
• https://access.redhat.com/errata/RHSA-2026:10158
• https://access.redhat.com/errata/RHSA-2026:10169
• https://access.redhat.com/errata/RHSA-2026:10175

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