Authentication Bypass by Primary Weakness Affecting curl package, versions [7.10.6,8.19.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-CURL-15460435
- published11 Mar 2026
- disclosed11 Mar 2026
- creditZhicheng Chen
Introduced: 11 Mar 2026
CVE-2026-1965 (opens in a new tab)How to fix?
Upgrade curl to version 8.19.0 or higher.
Overview
curl is a command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET and TFTP. libcurl offers a myriad of powerful features.
Affected versions of this package are vulnerable to Authentication Bypass by Primary Weakness in url.c, when negotiating an HTTP or HTTPS connection. An attacker can gain unauthorized access to resources or perform actions with the privileges of another user by forcing the reuse of an authenticated connection established with different credentials, on the same remote server.
Workaround
This vulnerability can be avoided by disabling connection reuse using the options CURLOPT_FRESH_CONNECT, CURLOPT_MAXCONNECTS, or CURLMOPT_MAX_HOST_CONNECTIONS.