Negotiate ambient user conn reuse (curl curl)
At a glance
- Source
- NVD
- EPSS
- EPSS 1.13 % · percentile 66 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- curl
- NVD status
- Modified
Description
A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection.
Weaknesses (CWE)
- CWE-488 — Exposure of Data Element to Wrong Session
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CISA-ADP |
| CVSS 3.1 | CRITICAL 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-72166
- GCVE · GCVE-0-2026-19931
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1351 — Multiples vulnérabilités dans Oracle MySQL · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1336 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1108 — Multiples vulnérabilités dans Curl · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*≥ 7.64.1 < 8.22.0
Affected products
| Product | Versions |
|---|---|
| curl · curl | affected 7.64.1 < 8.14.2 ; affected 8.15.0 < 8.16.1 ; affected 8.17.0 < 8.20.1 ; affected 8.21.0 < 8.22.0 |
| curl · curl | affected 6c6035532383e300c712e4c1cd9fdd749ed5cf59 < 7103a93b05bc69ea98ed9d05d02fa9eeba533f2f |
| curl · curl | affected 8.21.0 ; affected 8.20.0 ; affected 8.19.0 ; affected 8.18.0 ; affected 8.17.0 ; affected 8.16.0 |
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 |