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Vulnerability · CVE-2026-25679

Incorrect parsing of IPv6 host literals in net/url

Published Mar 6, 2026 · corrected/updated Oct 16, 2026 · Red Hat go · evidence confidence high

The Go standard library function net/url.Parse insufficiently validated the host/authority component and accepted some invalid URLs by effectively treating garbage before an IP-literal as ignorable. The function should have rejected this as invalid.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2026-25679 is a high public vulnerability record for Red Hat go. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether Red Hat go is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: stdlib (0 → 1.25.8); golang/go; golang/go (1.26.0). Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 7.5, EPSS 0.8%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-1286, CWE-425. Sources contributing to this record: csaf, csaf, cve_org, epss. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.

  • Patch and remediation

    No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 6, 2026 · OpenSSF OSV / OSV Scanner

    Detected

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

  2. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    stdlib fixed in 1.25.8

  3. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    stdlib fixed in 1.25.8

  4. Oct 15, 2026 · OpenSSF OSV / OSV Scanner

    Updated

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

  5. Oct 16, 2026 · OpenSSF OSV / OSV Scanner

    Updated

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

Affected

  • Go stdlib0 → 1.25.8
  • cpe golang/goversion unspecified
  • cpe golang/go1.26.0

Sources

  • CSAF AdvisoriesVendor advisoryRHSA-2026:9742:CVE-2026-25679

    The Go standard library function net/url.Parse insufficiently validated the host/authority component and accepted some invalid URLs by effectively treating garbage before an IP-literal as ignorable. The function should have rejected this as invalid.

    security.access.redhat.com
  • CSAF AdvisoriesVendor advisoryRHSA-2026:9872:CVE-2026-25679

    The Go standard library function net/url.Parse insufficiently validated the host/authority component and accepted some invalid URLs by effectively treating garbage before an IP-literal as ignorable. The function should have rejected this as invalid.

    security.access.redhat.com
  • CVE.orgVulnerability recordCVE-2026-25679

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-25679

    30-day exploitation probability 0.8%

    first.org
  • Go Vulnerability DatabasePackage advisoryGO-2026-4601

    Incorrect parsing of IPv6 host literals in net/url

    osv.dev
  • NIST NVDVulnerability recordCVE-2026-25679

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

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryGO-2026-4601

    Incorrect parsing of IPv6 host literals in net/url

    osv.dev

References