VulnerabilityModified
CVE-2026-3784
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.
MEDIUM 6.5EPSS 0.41%
Does this matter?
Lower severity and a low EPSS score (0.41%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- EPSS
- 0.41% probability · 35th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-305
- Affected
- haxx/curl
- Source
- 2499f714-1537-4658-8207-48ae4bb9eae9
References
- https://curl.se/docs/CVE-2026-3784.htmlPatch, Vendor Advisory
- https://curl.se/docs/CVE-2026-3784.jsonVendor Advisory
- https://hackerone.com/reports/3584903Exploit, Issue Tracking, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/11/3Mailing List, Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-253495.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.