CVE-2026-3783
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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4Description
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.
Analysis
OAuth2 bearer token leakage in curl and .NET occurs when HTTP redirects are followed to a second hostname that matches entries in the .netrc configuration file, allowing attackers to obtain valid authentication tokens for unintended hosts. Public exploit code exists for this vulnerability affecting curl and .NET applications that rely on OAuth2 authentication with automatic redirect handling. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.
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External POC / Exploit Code
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