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NVD HIGH: CVE-2026-6276 — Using libcurl, when a custom `Host:` header is first set for an HTTP request and...

·Source: NIST NVD

Updated:

Executive Summary

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.

Analysis

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. CVSS Score: 7.5. Published: 2026-05-13T13:01:56.800.

Indicators of Compromise (1)

CVE (1)
CVE-2026-6276
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on May 13, 2026. Verified by: NIST.

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