cross-origin Digest auth state leak
Summary
| CVE | CVE-2026-11856 |
|---|---|
| State | PUBLISHED |
| Assigner | curl |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-03 07:16:23 UTC |
| Updated | 2026-09-15 07:16:25 UTC |
| Description | Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`. |
Risk And Classification
Primary CVSS: v3.1 9.8 CRITICAL from ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.006880000 probability, percentile 0.508470000 (date 2026-09-15)
Problem Types: CWE-294 | CWE-294 Authentication Bypass by Capture-replay
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | DECLARED | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Curl | Curl | affected 7.10.6 8.14.2 semver | Not specified |
| CNA | Curl | Curl | affected 8.15.0 8.16.1 semver | Not specified |
| CNA | Curl | Curl | affected 8.17.0 8.20.1 semver | Not specified |
| CNA | Curl | Curl | affected 334d78cd18a7310144383929bdcef34ffbf6159b 5c6b4880357ab3e72967c1c45cae0f96ffabc535 git | Not specified |
| CNA | Curl | Curl | affected 8.20.0 | Not specified |
| CNA | Curl | Curl | affected 8.19.0 | Not specified |
| CNA | Curl | Curl | affected 8.18.0 | Not specified |
| CNA | Curl | Curl | affected 8.17.0 | Not specified |
| CNA | Curl | Curl | affected 8.16.0 | Not specified |
| CNA | Curl | Curl | affected 8.15.0 | Not specified |
| CNA | Curl | Curl | affected 8.14.1 | Not specified |
| CNA | Curl | Curl | affected 8.14.0 | Not specified |
| CNA | Curl | Curl | affected 8.13.0 | Not specified |
| CNA | Curl | Curl | affected 8.12.1 | Not specified |
| CNA | Curl | Curl | affected 8.12.0 | Not specified |
| CNA | Curl | Curl | affected 8.11.1 | Not specified |
| CNA | Curl | Curl | affected 8.11.0 | Not specified |
| CNA | Curl | Curl | affected 8.10.1 | Not specified |
| CNA | Curl | Curl | affected 8.10.0 | Not specified |
| CNA | Curl | Curl | affected 8.9.1 | Not specified |
| CNA | Curl | Curl | affected 8.9.0 | Not specified |
| CNA | Curl | Curl | affected 8.8.0 | Not specified |
| CNA | Curl | Curl | affected 8.7.1 | Not specified |
| CNA | Curl | Curl | affected 8.7.0 | Not specified |
| CNA | Curl | Curl | affected 8.6.0 | Not specified |
| CNA | Curl | Curl | affected 8.5.0 | Not specified |
| CNA | Curl | Curl | affected 8.4.0 | Not specified |
| CNA | Curl | Curl | affected 8.3.0 | Not specified |
| CNA | Curl | Curl | affected 8.2.1 | Not specified |
| CNA | Curl | Curl | affected 8.2.0 | Not specified |
| CNA | Curl | Curl | affected 8.1.2 | Not specified |
| CNA | Curl | Curl | affected 8.1.1 | Not specified |
| CNA | Curl | Curl | affected 8.1.0 | Not specified |
| CNA | Curl | Curl | affected 8.0.1 | Not specified |
| CNA | Curl | Curl | affected 8.0.0 | Not specified |
| CNA | Curl | Curl | affected 7.88.1 | Not specified |
| CNA | Curl | Curl | affected 7.88.0 | Not specified |
| CNA | Curl | Curl | affected 7.87.0 | Not specified |
| CNA | Curl | Curl | affected 7.86.0 | Not specified |
| CNA | Curl | Curl | affected 7.85.0 | Not specified |
| CNA | Curl | Curl | affected 7.84.0 | Not specified |
| CNA | Curl | Curl | affected 7.83.1 | Not specified |
| CNA | Curl | Curl | affected 7.83.0 | Not specified |
| CNA | Curl | Curl | affected 7.82.0 | Not specified |
| CNA | Curl | Curl | affected 7.81.0 | Not specified |
| CNA | Curl | Curl | affected 7.80.0 | Not specified |
| CNA | Curl | Curl | affected 7.79.1 | Not specified |
| CNA | Curl | Curl | affected 7.79.0 | Not specified |
| CNA | Curl | Curl | affected 7.78.0 | Not specified |
| CNA | Curl | Curl | affected 7.77.0 | Not specified |
| CNA | Curl | Curl | affected 7.76.1 | Not specified |
| CNA | Curl | Curl | affected 7.76.0 | Not specified |
| CNA | Curl | Curl | affected 7.75.0 | Not specified |
| CNA | Curl | Curl | affected 7.74.0 | Not specified |
| CNA | Curl | Curl | affected 7.73.0 | Not specified |
| CNA | Curl | Curl | affected 7.72.0 | Not specified |
| CNA | Curl | Curl | affected 7.71.1 | Not specified |
| CNA | Curl | Curl | affected 7.71.0 | Not specified |
| CNA | Curl | Curl | affected 7.70.0 | Not specified |
| CNA | Curl | Curl | affected 7.69.1 | Not specified |
| CNA | Curl | Curl | affected 7.69.0 | Not specified |
| CNA | Curl | Curl | affected 7.68.0 | Not specified |
| CNA | Curl | Curl | affected 7.67.0 | Not specified |
| CNA | Curl | Curl | affected 7.66.0 | Not specified |
| CNA | Curl | Curl | affected 7.65.3 | Not specified |
| CNA | Curl | Curl | affected 7.65.2 | Not specified |
| CNA | Curl | Curl | affected 7.65.1 | Not specified |
| CNA | Curl | Curl | affected 7.65.0 | Not specified |
| CNA | Curl | Curl | affected 7.64.1 | Not specified |
| CNA | Curl | Curl | affected 7.64.0 | Not specified |
| CNA | Curl | Curl | affected 7.63.0 | Not specified |
| CNA | Curl | Curl | affected 7.62.0 | Not specified |
| CNA | Curl | Curl | affected 7.61.1 | Not specified |
| CNA | Curl | Curl | affected 7.61.0 | Not specified |
| CNA | Curl | Curl | affected 7.60.0 | Not specified |
| CNA | Curl | Curl | affected 7.59.0 | Not specified |
| CNA | Curl | Curl | affected 7.58.0 | Not specified |
| CNA | Curl | Curl | affected 7.57.0 | Not specified |
| CNA | Curl | Curl | affected 7.56.1 | Not specified |
| CNA | Curl | Curl | affected 7.56.0 | Not specified |
| CNA | Curl | Curl | affected 7.55.1 | Not specified |
| CNA | Curl | Curl | affected 7.55.0 | Not specified |
| CNA | Curl | Curl | affected 7.54.1 | Not specified |
| CNA | Curl | Curl | affected 7.54.0 | Not specified |
| CNA | Curl | Curl | affected 7.53.1 | Not specified |
| CNA | Curl | Curl | affected 7.53.0 | Not specified |
| CNA | Curl | Curl | affected 7.52.1 | Not specified |
| CNA | Curl | Curl | affected 7.52.0 | Not specified |
| CNA | Curl | Curl | affected 7.51.0 | Not specified |
| CNA | Curl | Curl | affected 7.50.3 | Not specified |
| CNA | Curl | Curl | affected 7.50.2 | Not specified |
| CNA | Curl | Curl | affected 7.50.1 | Not specified |
| CNA | Curl | Curl | affected 7.50.0 | Not specified |
| CNA | Curl | Curl | affected 7.49.1 | Not specified |
| CNA | Curl | Curl | affected 7.49.0 | Not specified |
| CNA | Curl | Curl | affected 7.48.0 | Not specified |
| CNA | Curl | Curl | affected 7.47.1 | Not specified |
| CNA | Curl | Curl | affected 7.47.0 | Not specified |
| CNA | Curl | Curl | affected 7.46.0 | Not specified |
| CNA | Curl | Curl | affected 7.45.0 | Not specified |
| CNA | Curl | Curl | affected 7.44.0 | Not specified |
| CNA | Curl | Curl | affected 7.43.0 | Not specified |
| CNA | Curl | Curl | affected 7.42.1 | Not specified |
| CNA | Curl | Curl | affected 7.42.0 | Not specified |
| CNA | Curl | Curl | affected 7.41.0 | Not specified |
| CNA | Curl | Curl | affected 7.40.0 | Not specified |
| CNA | Curl | Curl | affected 7.39.0 | Not specified |
| CNA | Curl | Curl | affected 7.38.0 | Not specified |
| CNA | Curl | Curl | affected 7.37.1 | Not specified |
| CNA | Curl | Curl | affected 7.37.0 | Not specified |
| CNA | Curl | Curl | affected 7.36.0 | Not specified |
| CNA | Curl | Curl | affected 7.35.0 | Not specified |
| CNA | Curl | Curl | affected 7.34.0 | Not specified |
| CNA | Curl | Curl | affected 7.33.0 | Not specified |
| CNA | Curl | Curl | affected 7.32.0 | Not specified |
| CNA | Curl | Curl | affected 7.31.0 | Not specified |
| CNA | Curl | Curl | affected 7.30.0 | Not specified |
| CNA | Curl | Curl | affected 7.29.0 | Not specified |
| CNA | Curl | Curl | affected 7.28.1 | Not specified |
| CNA | Curl | Curl | affected 7.28.0 | Not specified |
| CNA | Curl | Curl | affected 7.27.0 | Not specified |
| CNA | Curl | Curl | affected 7.26.0 | Not specified |
| CNA | Curl | Curl | affected 7.25.0 | Not specified |
| CNA | Curl | Curl | affected 7.24.0 | Not specified |
| CNA | Curl | Curl | affected 7.23.1 | Not specified |
| CNA | Curl | Curl | affected 7.23.0 | Not specified |
| CNA | Curl | Curl | affected 7.22.0 | Not specified |
| CNA | Curl | Curl | affected 7.21.7 | Not specified |
| CNA | Curl | Curl | affected 7.21.6 | Not specified |
| CNA | Curl | Curl | affected 7.21.5 | Not specified |
| CNA | Curl | Curl | affected 7.21.4 | Not specified |
| CNA | Curl | Curl | affected 7.21.3 | Not specified |
| CNA | Curl | Curl | affected 7.21.2 | Not specified |
| CNA | Curl | Curl | affected 7.21.1 | Not specified |
| CNA | Curl | Curl | affected 7.21.0 | Not specified |
| CNA | Curl | Curl | affected 7.20.1 | Not specified |
| CNA | Curl | Curl | affected 7.20.0 | Not specified |
| CNA | Curl | Curl | affected 7.19.7 | Not specified |
| CNA | Curl | Curl | affected 7.19.6 | Not specified |
| CNA | Curl | Curl | affected 7.19.5 | Not specified |
| CNA | Curl | Curl | affected 7.19.4 | Not specified |
| CNA | Curl | Curl | affected 7.19.3 | Not specified |
| CNA | Curl | Curl | affected 7.19.2 | Not specified |
| CNA | Curl | Curl | affected 7.19.1 | Not specified |
| CNA | Curl | Curl | affected 7.19.0 | Not specified |
| CNA | Curl | Curl | affected 7.18.2 | Not specified |
| CNA | Curl | Curl | affected 7.18.1 | Not specified |
| CNA | Curl | Curl | affected 7.18.0 | Not specified |
| CNA | Curl | Curl | affected 7.17.1 | Not specified |
| CNA | Curl | Curl | affected 7.17.0 | Not specified |
| CNA | Curl | Curl | affected 7.16.4 | Not specified |
| CNA | Curl | Curl | affected 7.16.3 | Not specified |
| CNA | Curl | Curl | affected 7.16.2 | Not specified |
| CNA | Curl | Curl | affected 7.16.1 | Not specified |
| CNA | Curl | Curl | affected 7.16.0 | Not specified |
| CNA | Curl | Curl | affected 7.15.5 | Not specified |
| CNA | Curl | Curl | affected 7.15.4 | Not specified |
| CNA | Curl | Curl | affected 7.15.3 | Not specified |
| CNA | Curl | Curl | affected 7.15.2 | Not specified |
| CNA | Curl | Curl | affected 7.15.1 | Not specified |
| CNA | Curl | Curl | affected 7.15.0 | Not specified |
| CNA | Curl | Curl | affected 7.14.1 | Not specified |
| CNA | Curl | Curl | affected 7.14.0 | Not specified |
| CNA | Curl | Curl | affected 7.13.2 | Not specified |
| CNA | Curl | Curl | affected 7.13.1 | Not specified |
| CNA | Curl | Curl | affected 7.13.0 | Not specified |
| CNA | Curl | Curl | affected 7.12.3 | Not specified |
| CNA | Curl | Curl | affected 7.12.2 | Not specified |
| CNA | Curl | Curl | affected 7.12.1 | Not specified |
| CNA | Curl | Curl | affected 7.12.0 | Not specified |
| CNA | Curl | Curl | affected 7.11.2 | Not specified |
| CNA | Curl | Curl | affected 7.11.1 | Not specified |
| CNA | Curl | Curl | affected 7.11.0 | Not specified |
| CNA | Curl | Curl | affected 7.10.8 | Not specified |
| CNA | Curl | Curl | affected 7.10.7 | Not specified |
| CNA | Curl | Curl | affected 7.10.6 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| curl.se/docs/CVE-2026-11856.html | 2499f714-1537-4658-8207-48ae4bb9eae9 | curl.se | Patch, Vendor Advisory |
| curl.se/docs/CVE-2026-11856.json | 2499f714-1537-4658-8207-48ae4bb9eae9 | curl.se | Vendor Advisory |
| hackerone.com/reports/3793260 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | hackerone.com | Exploit, Issue Tracking, Third Party Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: jjchuck on hackerone (en)
CNA: Daniel Stenberg (en)
There are currently no legacy QID mappings associated with this CVE.