Insertion of Sensitive Information Into Sent Data Affecting curl package, versions [7.14.0,8.20.0)
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-16340427
- published2 May 2026
- disclosed29 Apr 2026
- creditMuhamad Arga Reksapati
Introduced: 29 Apr 2026
CVE-2026-6429 (opens in a new tab)How to fix?
Upgrade curl to version 8.20.0 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 Insertion of Sensitive Information Into Sent Data via the reuse of a proxy connection during HTTP redirects when using .netrc for credentials. An attacker can obtain sensitive credential information by intercepting traffic if both the original and redirect URLs use clear text HTTP, are performed over the same HTTP proxy, and the same connection is reused.
Workaround
This vulnerability can be mitigated by avoiding the combination of .netrc for credentials, clear text HTTP URLs, and an HTTP proxy when making requests with libcurl.