cross-origin reuse of a Negotiate connection

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-87861
StatePUBLISHED
Assignercurl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-20 21:17:20 UTC
Updated2026-10-20 21:17:20 UTC
DescriptionWhen using ambient user credentials, an HTTP request directed to one origin may be dispatched over a connection previously authenticated via Negotiate for a different origin, leaving the request's intended credentials unused.

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-2026-87861.html 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se
hackerone.com/reports/3972094 2499f714-1537-4658-8207-48ae4bb9eae9 hackerone.com
curl.se/docs/CVE-2026-87861.json 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se
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: Axel Mierczuk (en)

CNA: Stefan Eissing (en)

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