CVE
CVE-2026-11856
cross-origin Digest auth state leak
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.
Package Versions Affected
Package Version
patch Availability
No items found.
Automatically patch vulnerabilities without upgrading
Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request
CVSS Version
Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-
Related Resources
No items found.
References
https://curl.se/docs/CVE-2026-11856.html, https://curl.se/docs/CVE-2026-11856.json, https://hackerone.com/reports/3793260, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11856.json, https://nvd.nist.gov/vuln/detail/CVE-2026-11856