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Vulnerabilities

Vulnerability · 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.

Published Mar 11, 2026 · catalog updated Oct 18, 2026 · curl would wrongly reuse

Check if you run it

No confirmed exploitation is on record for CVE-2026-3784. EPSS is 0.47%. Act only if a listed version of curl would wrongly reuse is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (curl would wrongly reuse).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.47%
Remediation
Advisory link
Affected products
Alpine:v3.21 curl · Alpine:v3.22 curl · Alpine:v3.23 curl · Alpine:v3.24 curl · cpe haxx/curl

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Alpine:v3.21 curl7.7 → 8.14.1-r3
  • Alpine:v3.22 curl7.7 → 8.14.1-r4
  • Alpine:v3.23 curl7.7 → 8.19.0-r0
  • Alpine:v3.24 curl7.7 → 8.19.0-r0
  • cpe haxx/curlversion unspecified

How to fix CVE-2026-3784

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-3784. EPSS is 0.47%. Act only if a listed version of curl would wrongly reuse is installed.

Which versions are affected?

Compare what you have installed with 7.7 → 8.14.1-r3, 7.7 → 8.14.1-r4, 7.7 → 8.19.0-r0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-305. EPSS 0.47%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 11, 2026 · NIST NVD

    Detected

    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.

  2. Sep 15, 2026 · NIST NVD

    Updated

    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.

  3. Oct 18, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    curl fixed in 8.14.1-r3; curl fixed in 8.14.1-r4; curl fixed in 8.19.0-r0; curl fixed in 8.19.0-r0

  4. Oct 18, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    curl fixed in 8.14.1-r3

  5. Oct 18, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    curl fixed in 8.14.1-r4

  6. Oct 18, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    curl fixed in 8.19.0-r0

  7. Oct 18, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-3784

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-3784

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-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. The proper behavior is to create or use a separate connection.

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryALPINE-CVE-2026-3784
    osv.dev
  • Trivy Vulnerability DBPackage advisoryALPINE-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. The proper behavior is to create or use a separate connection.

    osv.dev

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.