Authentication Bypass by Primary Weakness Affecting curl package, versions [7.7-beta1,8.19.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-15460437
- published11 Mar 2026
- disclosed11 Mar 2026
- creditMuhamad Arga Reksapati
Introduced: 11 Mar 2026
CVE-2026-3784 (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 the url_match_proxy_use() function used by the CONNECT operation for an HTTP proxy connection. An attacker in control of an already-authenticated connection can authenticate using its credentials on a different proxy-authenticated connection.