wrong proxy connection reuse with credentials
Priority LOW 35CWE-305Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Partial Red Hat: 6 fixed, 12 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00448 39th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial curl (curl): 8.14.2, 8.16.1, 8.19.0Red Hat: 6 advisoriesRed Hat: 6 fixed, 12 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| curl | curl | 7.7.0 to before 8.14.2; 8.15.0 to before 8.16.1; 8.17.0 to before 8.19.0 | 8.14.2, 8.16.1, 8.19.0 | Patch available | CNA |
| curl | curl | 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 | — | No fix listed | CNA |
- curl Vendorcurl Affected 7.7.0 to before 8.14.2; 8.15.0 to before 8.16.1; 8.17.0 to before 8.19.0 Fixed in 8.14.2, 8.16.1, 8.19.0 Patch available CNA
- curl Vendorcurl Affected 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 Fixed in — No fix listed CNA
Remediation
- Fix · CNA curl (curl) Fixed in 8.14.2, 8.16.1, 8.19.0
Red Hat 6 advisories
- RHSA-2026:77255 Released 2026-10-07 · Red Hat rating ModerateRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images curl-8.22.0-1.1.hum1@aarch64, curl-8.22.0-1.1.hum1@s390x, curl-8.22.0-1.1.hum1@src +10
- RHSA-2026:72506 Released 2026-09-28 · Red Hat rating Importantcurl security update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) libcurl-devel-8.12.1-1.el10_0.10
- Red Hat Enterprise Linux BaseOS EUS (v. 10.0) curl-8.12.1-1.el10_0.10, libcurl-8.12.1-1.el10_0.10, libcurl-minimal-8.12.1-1.el10_0.10
- RHSA-2026:56869 Released 2026-08-19 · Red Hat rating ImportantRed Hat JBoss Core Services Apache HTTP Server 2.4.62 SP5 security update
- Red Hat JBoss Core Services 2.4.62.SP5
Show 3 more Red Hat advisories
- RHSA-2026:55450 Released 2026-08-17 · Red Hat rating Importantcurl security update
- Red Hat Enterprise Linux AppStream (v. 10) libcurl-devel-8.12.1-4.el10_2.3
- Red Hat Enterprise Linux BaseOS (v. 10) curl-8.12.1-4.el10_2.3, libcurl-8.12.1-4.el10_2.3, libcurl-minimal-8.12.1-4.el10_2.3
- RHSA-2026:7432 Released 2026-04-10 · Red Hat rating ModerateRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images curl-8.19.0-3.1.hum1@aarch64, curl-8.19.0-3.1.hum1@src, curl-8.19.0-3.1.hum1@x86_64 +6
- RHSA-2026:6893 Released 2026-04-07 · Red Hat rating ModerateRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images curl-8.19.0-3.hum1@aarch64, curl-8.19.0-3.hum1@src, curl-8.19.0-3.hum1@x86_64 +6
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
curl 8.14.2, 8.16.1, 8.19.0
4 records Highest priority Priority HIGH 1 HIGH, 1 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2026-03294 use after free in SMB connection reusePriority HIGH 72
- TI-2026-03272 token leak with redirect and netrcPriority MEDIUM 63
- TI-2026-01624 bad reuse of HTTP Negotiate connectionPriority LOW 29
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Confidential Compute Attestation | Affected | No fix yet: Fix deferred |
| Logging Subsystem for Red Hat OpenShift | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 6 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat Enterprise Linux AI (RHEL AI) 3 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift AI (RHOAI) | Affected | — |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Dev Spaces | Affected | No fix yet: Fix deferred |
| Red Hat Trusted Profile Analyzer | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:55450 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:72506 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:55450 |
| Red Hat Enterprise Linux BaseOS EUS (v. 10.0) | Fixed | RHSA-2026:72506 |
| Red Hat Hardened Images | Fixed | RHSA-2026:6893, RHSA-2026:7432, RHSA-2026:77255 |
| Red Hat JBoss Core Services 2.4.62.SP5 | Fixed | RHSA-2026:56869 |
Not affected: 3 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift AI (RHOAI)
Timeline
- 2026-10-02 Threatist record created from CVE-2026-3784
- 2026-10-03 Alias added: GHSA-5q3w-6p3j-mw6p
- 2026-10-09 Fix available: RHSA-2026:56869 · Red Hat
- 2026-10-09 Fix available: Red Hat JBoss Core Services 2.4.62.SP5 · Red Hat
- 2026-10-12 Fix available: RHSA-2026:77255 · Red Hat
- 2026-10-12 Affected versions changed · Red Hat
- 2026-10-16 Fix available: RHSA-2026:7432 · Red Hat
- 2026-10-16 Affected versions changed · Red Hat
- 2026-11-06 Affected versions changed · Red Hat
References
More curl vulnerabilities
- TI-2023-19922 Out-of-bounds write in curl CVSS 3.1CRITICAL 9.8
- TI-2026-16162 Negotiate ambient user conn reuse CVSS 3.1CRITICAL 9.8
- TI-2026-10231 cross-origin Digest auth state leak CVSS 3.1CRITICAL 9.8
- TI-2026-09063 HTTP/2 stream-dependency tree UAF CVSS 3.1CRITICAL 9.8
- TI-2026-07976 stale proxy password leak CVSS 3.1CRITICAL 9.8
- TI-2026-07845 SASL double-free CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-3784 · CVE Program
- CVE-2026-3784 · NVD
- FIRST EPSS
- GHSA-5q3w-6p3j-mw6p · GitHub Advisory Database · CC BY 4.0
- CVE-2026-3784 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences