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29impact

token leak with redirect and netrc

curl · CVE-2026-3783
0 news outlets0 CERTs and agencies0 researchers

What is it?

When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a redirect to a second URL, curl could leak that token to the second hostname under some circumstances. If the hostname that the first request is redirected to has information in the used .netrc file, with either of the `machine` or `default` keywords, curl would pass on the bearer token set for the first host also to the second one.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
5.3
EPSS
0.5%
First seen
2 d ago
Status
corroborated

All curl vulnerabilities