Insufficiently Protected Credentials Affecting curl package, versions [7.14.1,8.20.0)
Threat Intelligence
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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-16338897
- published2 May 2026
- disclosed29 Apr 2026
- creditDwij Mehta
Introduced: 29 Apr 2026
CVE-2026-6253 (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 Insufficiently Protected Credentials via improper handling of proxy authentication during redirects when distinct proxies are configured for different URL schemes. An attacker can obtain sensitive proxy credentials by intercepting traffic between the client and the second proxy. This is only exploitable if the application is configured to use multiple proxies with at least one requiring authentication and another not requiring authentication, and a redirect occurs between them.