CVE & CISA-KEV Catalog

CVE-2026-3784

MEDIUM
6.5
CVSS v3
NVD

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.

CWE-305

How to fix

Remediation Available
curlDebian
Fixed in:8.19.0-1CVE-2026-3784
curlUbuntu
Fixed in:7.58.0-2ubuntu3.24+esm8USN-8099-1
Fixed in:7.68.0-1ubuntu2.25+esm3USN-8099-1
Fixed in:7.81.0-1ubuntu1.23USN-8084-1
Fixed in:8.5.0-2ubuntu10.8USN-8084-1
Fixed in:8.14.1-2ubuntu1.2USN-8084-1
libcurl3-gnutlsUbuntu
Fixed in:7.58.0-2ubuntu3.24+esm8USN-8099-1
Fixed in:7.68.0-1ubuntu2.25+esm3USN-8099-1
Fixed in:7.81.0-1ubuntu1.23USN-8084-1
libcurl3-nssUbuntu
Fixed in:7.58.0-2ubuntu3.24+esm8USN-8099-1
Fixed in:7.68.0-1ubuntu2.25+esm3USN-8099-1
Fixed in:7.81.0-1ubuntu1.23USN-8084-1
libcurl3t64-gnutlsUbuntu
Fixed in:8.5.0-2ubuntu10.8USN-8084-1
Fixed in:8.14.1-2ubuntu1.2USN-8084-1
libcurl4Ubuntu
Fixed in:7.58.0-2ubuntu3.24+esm8USN-8099-1
Fixed in:7.68.0-1ubuntu2.25+esm3USN-8099-1
Fixed in:7.81.0-1ubuntu1.23USN-8084-1
libcurl4t64Ubuntu
Fixed in:8.5.0-2ubuntu10.8USN-8084-1
Fixed in:8.14.1-2ubuntu1.2USN-8084-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityLow
IntegrityLow
AvailabilityNone

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

Exploit Intelligence

0.30%probability of exploitation in 30 days
22ndpercentile

Low risk: more likely to be exploited than 22% of all known CVEs.

References

Patch1
Vendor Advisory1
Third-Party Advisory1
Other references1
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-02.