Undici proxy-authorization header not cleared on cross-origin redirect in fetch

Impact

Undici already cleared Authorization headers on cross-origin redirects, but did not clear Proxy-Authorization headers.

Patches

This is patched in v5.28.3 and v6.6.1

Workarounds

There are no known workarounds.

References

• https://fetch.spec.whatwg.org/#authentication-entries
• https://github.com/nodejs/undici/security/advisories/GHSA-wqq4-5wpv-mx2g