CVE-2026-6276

HighCVSS 7.5/10Last modified Sep 15, 2026

Description

Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done using the same *easy handle* but without the custom `Host:` header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-346CWE-319

Affected software

No affected versions have been published.

Timeline

Published
May 13, 2026
Last modified
Sep 15, 2026
NVD status
Modified

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CVE-2026-6276: High severity, CVSS 7.5 | Vulnix