CVE-2026-11856
cross-origin Digest auth state leak
Description
Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.
INFO
Published Date :
July 3, 2026, 6:13 a.m.
Last Modified :
July 3, 2026, 6:13 a.m.
Remotely Exploit :
No
Source :
curl
Affected Products
The following products are affected by CVE-2026-11856
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.
No affected product recoded yet
Solution
- Clear the Authorization header after the first transfer.
- Perform the second transfer with the reset header.
- Update libcurl to the latest stable version.
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-2026-11856 vulnerability anywhere in the article.