CVE-2026-6276

0.0

stale custom cookie host causes cookie leak

Overview

Overview

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.

Details

INFO

Published Date :

May 13, 2026, 8:28 a.m.

Last Modified :

May 13, 2026, 9:05 a.m.

Remotely Exploit :

No

Source :

curl

Impact

Affected Products

The following products are affected by CVE-2026-6276 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Haxx	curl

: Total Affected Vendor : 1 | Products : 1

Solution

Clear all cookies before making subsequent requests with different hosts.

Clear cookies associated with the easy handle.
Ensure Host header is reset for new requests.
Re-initialize handle if stale cookies persist.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-6276 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.

Misconfiguration

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