CVE-2025-22870 - CVE House

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Status published Unknown CVE-2025-22870

HTTP Proxy bypass using IPv6 Zone IDs in golang.org/x/net

0 CVSS

Vulnerability Description

Matching of hosts against proxy patterns can improperly treat an IPv6 zone ID as a hostname component. For example, when the NO_PROXY environment variable is set to "*.example.com", a request to "[::1%25.example.com]:80` will incorrectly match and not be proxied.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Juho Forsén of Mattermost

References

More from Go standard library

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Unexpected session resumption in crypto/tls

Handshake messages may be processed at the incorrect encryption level in crypto/tls

Excessive resource consumption when printing error string for host certificate validation in crypto/x509

Excessive CPU consumption when building archive index in archive/zip

Improper application of excluded DNS name constraints when verifying wildcard names in crypto/x509

Affected Vendor

Go standard library

View all reports →

Affected Software

net/http, golang.org/x/net/http/httpproxy, golang.org/x/net/proxy

Vulnerable Versions:

0, 1.24.0-0

Timeline

Official Publish: March 12th, 2025

Last Modified: April 16th, 2026

Added to House: July 22nd, 2026

CVSS Vectors

No vector data available

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.