6.5

CVE-2026-3784: wrong proxy connection reuse with credentials

Modified
AliasesALPINE-CVE-2026-3784UBUNTU-CVE-2026-3784DEBIAN-CVE-2026-3784
Published 11-03-2026Last modified 15-09-2026

Vulnerability summary

CVE-2026-3784 is a medium (CVSS 6.5) vulnerability in curl. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 37.1% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.43%
0%100%
Low · -0.02 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 18 · Related 13
OPENSUSE-SU-2026:10371-1OPENSUSE-SU-2026:20404-1RHSA-2026:55450RHSA-2026:6893RHSA-2026:72506RHSA-2026:7432

Timeline

  1. 11-03-2026
    PublishedVulnerability first disclosed.
  2. 15-09-2026
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

37%

Versus all other CVEs

30-day change

Decrease -0.02 pp

From 0.45% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (hackerone.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Alpine1 product
  • curl≥ 7.7, < 8.14.1-r3 | ≥ 7.7, < 8.14.1-r4 | ≥ 7.7, < 8.19.0-r0
Chainguard1 product
  • libcurl4All versions (No fix recorded)
Curl1 product
  • curl≥ 7.7.0, < 8.14.2 | ≥ 8.15.0, < 8.16.1 | ≥ 8.17.0, < 8.19.0 | ≥ a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4, < 5f13a7645e565c5c1a06f3ef86e97afb856fb364 | 8.18.0 | 8.17.0 | 8.16.0 | 8.15.0 | 8.14.1 | 8.14.0 | 8.13.0 | 8.12.1 | 8.12.0 | 8.11.1 | 8.11.0 | 8.10.1 | 8.10.0 | 8.9.1 | 8.9.0 | 8.8.0 | 8.7.1 | 8.7.0 | 8.6.0 | 8.5.0 | 8.4.0 | 8.3.0 | 8.2.1 | 8.2.0 | 8.1.2 | 8.1.1 | 8.1.0 | 8.0.1 | 8.0.0 | 7.88.1 | 7.88.0 | 7.87.0 | 7.86.0 | 7.85.0 | 7.84.0 | 7.83.1 | 7.83.0 | 7.82.0 | 7.81.0 | 7.80.0 | 7.79.1 | 7.79.0 | 7.78.0 | 7.77.0 | 7.76.1 | 7.76.0 | 7.75.0 | 7.74.0 | 7.73.0 | 7.72.0 | 7.71.1 | 7.71.0 | 7.70.0 | 7.69.1 | 7.69.0 | 7.68.0 | 7.67.0 | 7.66.0 | 7.65.3 | 7.65.2 | 7.65.1 | 7.65.0 | 7.64.1 | 7.64.0 | 7.63.0 | 7.62.0 | 7.61.1 | 7.61.0 | 7.60.0 | 7.59.0 | 7.58.0 | 7.57.0 | 7.56.1 | 7.56.0 | 7.55.1 | 7.55.0 | 7.54.1 | 7.54.0 | 7.53.1 | 7.53.0 | 7.52.1 | 7.52.0 | 7.51.0 | 7.50.3 | 7.50.2 | 7.50.1 | 7.50.0 | 7.49.1 | 7.49.0 | 7.48.0 | 7.47.1 | 7.47.0 | 7.46.0 | 7.45.0 | 7.44.0 | 7.43.0 | 7.42.1 | 7.42.0 | 7.41.0 | 7.40.0 | 7.39.0 | 7.38.0 | 7.37.1 | 7.37.0 | 7.36.0 | 7.35.0 | 7.34.0 | 7.33.0 | 7.32.0 | 7.31.0 | 7.30.0 | 7.29.0 | 7.28.1 | 7.28.0 | 7.27.0 | 7.26.0 | 7.25.0 | 7.24.0 | 7.23.1 | 7.23.0 | 7.22.0 | 7.21.7 | 7.21.6 | 7.21.5 | 7.21.4 | 7.21.3 | 7.21.2 | 7.21.1 | 7.21.0 | 7.20.1 | 7.20.0 | 7.19.7 | 7.19.6 | 7.19.5 | 7.19.4 | 7.19.3 | 7.19.2 | 7.19.1 | 7.19.0 | 7.18.2 | 7.18.1 | 7.18.0 | 7.17.1 | 7.17.0 | 7.16.4 | 7.16.3 | 7.16.2 | 7.16.1 | 7.16.0 | 7.15.5 | 7.15.4 | 7.15.3 | 7.15.2 | 7.15.1 | 7.15.0 | 7.14.1 | 7.14.0 | 7.13.2 | 7.13.1 | 7.13.0 | 7.12.3 | 7.12.2 | 7.12.1 | 7.12.0 | 7.11.2 | 7.11.1 | 7.11.0 | 7.10.8 | 7.10.7 | 7.10.6 | 7.10.5 | 7.10.4 | 7.10.3 | 7.10.2 | 7.10.1 | 7.10 | 7.9.8 | 7.9.7 | 7.9.6 | 7.9.5 | 7.9.4 | 7.9.3 | 7.9.2 | 7.9.1 | 7.9 | 7.8.1 | 7.8 | 7.7.3 | 7.7.2 | 7.7.1 | 7.7
Debian1 product
  • curl< 7.88.1-10+deb12u15 | < 8.14.1-2+deb13u4 | < 8.19.0-1
Haxx1 product
  • curl≥ 7.7, < 8.18.0
Ubuntu1 product
  • curl< 7.58.0-2ubuntu3.24+esm8 | < 7.68.0-1ubuntu2.25+esm3 | < 7.81.0-1ubuntu1.23 | < 8.5.0-2ubuntu10.8 | < 8.14.1-2ubuntu1.2 | < 8.18.0-1ubuntu2
Wolfi1 product
  • libcurl4All versions (No fix recorded)

7 vendors · 7 products

References

12 links
Show all 12 references