UBUNTU-CVE-2026-11856

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2026-11856
Published: 24 Jun 2026, 14:00
Last modified:10 Jul 2026, 02:26

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

24 Jun 2026, 14:00
Published
Vulnerability first disclosed
10 Jul 2026, 02:26
Last Modified
Vulnerability information updated

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`.

CVSS Metrics

  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Systems

  • ubuntu•curl

    all | all | all | all | all

References (3)