CVE-2026-11856

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`.

Scoring

Severity

CRITICAL

CVSS base score

9.8

CVSS vector

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

EPSS probability

0.69%

CWE

CWE-294

Published

2026-07-03

Last modified

2026-09-17

Affected products

• curl curl
• curl curl
• curl curl
• curl curl
• curl curl
• curl curl
• curl curl
• curl curl

Weakness type

• CWE-294

Related vulnerabilities

• CVE-2026-65905 — Apache Tomcat: Limited replay attack possible with DIGEST authentication
• CVE-2024-38438 — D-Link - CWE-294: Authentication Bypass by Capture-replay
• CVE-2025-6030 — Autoeastern Smart Keyless Entry System Replay Attack
• CVE-2025-6029 — KIA-branded Aftermarket Generic Smart Keyless Entry System Replay Attack
• CVE-2023-0014 — Capture-replay vulnerability in SAP NetWeaver AS for ABAP and ABAP Platform
• CVE-2025-36593 — Dell OpenManage Network Integration, versions prior to 3.8, contains an Authentication Bypass by Capture-replay vulnerab
• CVE-2024-43099 — AutomationDirect DirectLogic H2-DM1E Authentication Bypass by Capture-replay
• CVE-2024-12839 — Changing Information Technology CGFIDO - Authentication Bypass

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