[ CVE-2026-87861 · Published 20 Oct 2026 ]
Vulnerability in curl
Not scored yet
EPSS <1%2 agency advisoriesNo fix listed yet
[ Description ]Official description
When 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.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ Advisories ]Government CERT advisories
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CERT-FRCERTFR-2026-AVI-1307
Multiple vulnerabilities in Curl Translated from French
Multiple vulnerabilities have been discovered in Curl. Some of them allow an attacker to cause remote arbitrary code execution, remote denial of service and a breach of data confidentiality.
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BSI CERT-BundWID-SEC-2026-3904
cURL: Multiple vulnerabilities Translated from German