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VULNERABILITIES

CVE-2026-86413 Details

Description

When using an *ambient user* in a first transfer doing Negotiate authentication and asked to follow redirects, curl could pass on its credential details to an unrelated second origin when asked to redirect there.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://hackerone.com/reports/3993549 CISA-ADP
https://curl.se/docs/CVE-2026-86413.html curl
https://curl.se/docs/CVE-2026-86413.json curl
https://hackerone.com/reports/3993549 curl

Weakness Enumeration

CWE-IDCWE NameSource
CWE-201Insertion of Sensitive Information Into Sent DataCISA-ADP

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-86413
NVD Published Date:
Oct 20, 2026
NVD Last Modified:
Oct 30, 2026
Source:
curl
CVE-2026-86413 Details - Not Deferred