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THREATINT
PUBLISHED

CVE-2025-22870

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



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.

Reserved 2025-01-08 | Published 2025-03-12 | Updated 2025-03-12 | Assigner Go

Problem types

CWE-115 Misinterpretation of Input

Product status

Default status
unaffected

Any version before 0.36.0
affected

Default status
unaffected

Any version before 0.36.0
affected

Credits

Juho Forsén of Mattermost

References

go.dev/cl/654697

go.dev/issue/71984

pkg.go.dev/vuln/GO-2025-3503

cve.org (CVE-2025-22870)

nvd.nist.gov (CVE-2025-22870)

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