Ghostwire

CVE-2026-6276: Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done...

LOW CVSS 2.5 EPSS 0.01%

Published: May 13, 2026 | Last Modified: May 13, 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.

Ghostwire Analysis — What This Means Practically

Exploitation Probability (EPSS): Low — 0.01% (1th percentile)

Low exploitation probability based on current threat landscape data. Standard patching timeline is appropriate.

This analysis is generated by Ghostwire from NVD, CISA KEV, EPSS, and open-source intelligence data. Verify findings through primary sources before acting.

Security Coverage (2 articles)

References