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CVE-2026-86413 is a credential-disclosure vulnerability in curl's handling of Negotiate authentication across redirects. When an initial transfer uses ambient user credentials for Negotiate authentication and curl is configured to follow redirects, authentication information can be forwarded to an unrelated second origin. This violates the authentication boundary between origins and exposes credential details to an unintended recipient. The vulnerability affects curl versions earlier than 8.23.0; the precise version in which it was introduced is not established.
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A credential-disclosure vulnerability in curl can expose ambient-user credentials to an unrelated origin when following redirects during Negotiate authentication. The advisory rates it Low severity, with a CVSS v3.1 score of 3.7. Fixes are pending for Amazon Linux 2023 and Amazon Linux 2027 Preview; Amazon Linux 2 Core is listed as not affected.
A redirect-handling flaw can send Negotiate authentication information to a destination that should not receive it.
Low-severity vulnerability in curl fixed in version 8.23.0. The article provides no technical details.
A vulnerability affecting the Curl package on FreeBSD, listed in the advisory's Nessus plugin. Its specific mechanism and impact are not described. Updating affected packages is the stated remediation.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.