CVE-2026-3784

6.5 mediumEPSS 0.4%

Medium (6.5) in haxx curl. EPSS 0.4% chance of exploitation in the next 30 days.

curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a server, even if the new request uses different credentials for the HTTP proxy. The proper behavior is to create or use a separate connection.

Severity

CVSS 3.1

6.5 medium

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 37% of CVEs (scores of 2026-10-31)
CWE: CWE-305
Published: 2026-03-11
Modified: 2026-09-15
Record from: the NVD, synced 2026-10-19

Affected

haxx:curl

References

https://curl.se/docs/CVE-2026-3784.html
https://curl.se/docs/CVE-2026-3784.json
https://hackerone.com/reports/3584903
http://www.openwall.com/lists/oss-security/2026/03/11/3
https://cert-portal.siemens.com/productcert/html/ssa-253495.html

Check your stack JSON