Negotiate credentials sent to redirected origin

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-86413
StatePUBLISHED
Assignercurl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-20 20:17:25 UTC
Updated2026-10-20 20:17:25 UTC
DescriptionWhen 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.

Risk And Classification

Problem Types: CWE-201 Information Exposure Through Sent Data

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Curl Curl affected 8.22.0 8.22.0 semver Not specified
CNA Curl Curl affected 8.21.0 8.21.0 semver Not specified

References

ReferenceSourceLinkTags
curl.se/docs/CVE-2026-86413.json 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se
curl.se/docs/CVE-2026-86413.html 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se
hackerone.com/reports/3993549 2499f714-1537-4658-8207-48ae4bb9eae9 hackerone.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Stanislav Fort (Aisle Research) (en)

CNA: Stefan Eissing (en)

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