VULNERABILITY INTELLIGENCE

CVE-2026-6276

CVSS score7.5 HIGH

EPSS probability0.29%

CISA KEVNot currently listed

Published2026-05-13

Last modified2026-09-15

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

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.

Weakness classification

2499f714-1537-4658-8207-48ae4bb9eae9: CWE-346
nvd@nist.gov: CWE-319

Primary references

2499f714-1537-4658-8207-48ae4bb9eae9 — Patch, Vendor Advisory
2499f714-1537-4658-8207-48ae4bb9eae9 — Product
2499f714-1537-4658-8207-48ae4bb9eae9 — Exploit, Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Issue Tracking, Third Party Advisory