CVE-2026-8927

When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against `proxyA` using Digest auth, a subsequent transfer routed through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended solely for `proxyA`.

Scoring

Severity

CRITICAL

CVSS base score

9.1

CVSS vector

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

EPSS probability

0.50%

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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