leaking host credentials to HTTP proxy (curl curl)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.68 % · percentile 52 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- curl
- NVD status
- Awaiting Analysis
Description
An HTTP proxy can trick libcurl into sending the origin's credentials (Basic password, or a Negotiate/Kerberos ticket) to the proxy itself, by answering the `CONNECT` tunnel request with 401 `WWW-Authenticate:` instead of the expected 407 `Proxy-Authenticate:`.
Weaknesses (CWE)
- CWE-201 — Insertion of Sensitive Information Into Sent Data
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | CISA-ADP |
| CVSS 3.1 | CRITICAL 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-105306
- GCVE · GCVE-0-2026-86414
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1376 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1307 — Multiples vulnérabilités dans Curl · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| curl · curl | affected 8.22.0 ≤ 8.22.0 ; affected 8.21.0 ≤ 8.21.0 ; affected 8.20.0 ≤ 8.20.0 ; affected 8.19.0 ≤ 8.19.0 ; affected 8.18.0 ≤ 8.18.0 ; affected 8.17.0 ≤ 8.17.0 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |