CVE-2026-3783

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.

• CWE-522

• https://curl.se/docs/CVE-2026-3783.htmlPatch, Vendor Advisory
• https://curl.se/docs/CVE-2026-3783.jsonVendor Advisory
• https://hackerone.com/reports/3583983Exploit, Issue Tracking, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2026/03/11/2Mailing List, Third Party Advisory

Published

Mar 11, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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