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`.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
curl curl unaffected
Version Status Constraints
8.20.0 affected ≤ 8.20.0
8.19.0 affected ≤ 8.19.0
8.18.0 affected ≤ 8.18.0
8.17.0 affected ≤ 8.17.0
8.16.0 affected ≤ 8.16.0
8.15.0 affected ≤ 8.15.0
8.14.1 affected ≤ 8.14.1
8.14.0 affected ≤ 8.14.0
8.13.0 affected ≤ 8.13.0
8.12.1 affected ≤ 8.12.1
8.12.0 affected ≤ 8.12.0
8.11.1 affected ≤ 8.11.1
8.11.0 affected ≤ 8.11.0
8.10.1 affected ≤ 8.10.1
8.10.0 affected ≤ 8.10.0
8.9.1 affected ≤ 8.9.1
8.9.0 affected ≤ 8.9.0
8.8.0 affected ≤ 8.8.0
8.7.1 affected ≤ 8.7.1
8.7.0 affected ≤ 8.7.0
8.6.0 affected ≤ 8.6.0
8.5.0 affected ≤ 8.5.0
8.4.0 affected ≤ 8.4.0
8.3.0 affected ≤ 8.3.0
8.2.1 affected ≤ 8.2.1
8.2.0 affected ≤ 8.2.0
8.1.2 affected ≤ 8.1.2
8.1.1 affected ≤ 8.1.1
8.1.0 affected ≤ 8.1.0
8.0.1 affected ≤ 8.0.1
8.0.0 affected ≤ 8.0.0
7.88.1 affected ≤ 7.88.1
7.88.0 affected ≤ 7.88.0
7.87.0 affected ≤ 7.87.0
7.86.0 affected ≤ 7.86.0
7.85.0 affected ≤ 7.85.0
7.84.0 affected ≤ 7.84.0
7.83.1 affected ≤ 7.83.1
7.83.0 affected ≤ 7.83.0
7.82.0 affected ≤ 7.82.0
7.81.0 affected ≤ 7.81.0
7.80.0 affected ≤ 7.80.0
7.79.1 affected ≤ 7.79.1
7.79.0 affected ≤ 7.79.0
7.78.0 affected ≤ 7.78.0
7.77.0 affected ≤ 7.77.0
7.76.1 affected ≤ 7.76.1
7.76.0 affected ≤ 7.76.0
7.75.0 affected ≤ 7.75.0
7.74.0 affected ≤ 7.74.0
7.73.0 affected ≤ 7.73.0
7.72.0 affected ≤ 7.72.0
7.71.1 affected ≤ 7.71.1
7.71.0 affected ≤ 7.71.0
7.70.0 affected ≤ 7.70.0
7.69.1 affected ≤ 7.69.1
7.69.0 affected ≤ 7.69.0
7.68.0 affected ≤ 7.68.0
7.67.0 affected ≤ 7.67.0
7.66.0 affected ≤ 7.66.0
7.65.3 affected ≤ 7.65.3
7.65.2 affected ≤ 7.65.2
7.65.1 affected ≤ 7.65.1
7.65.0 affected ≤ 7.65.0
7.64.1 affected ≤ 7.64.1
7.64.0 affected ≤ 7.64.0
7.63.0 affected ≤ 7.63.0
7.62.0 affected ≤ 7.62.0
7.61.1 affected ≤ 7.61.1
7.61.0 affected ≤ 7.61.0
7.60.0 affected ≤ 7.60.0
7.59.0 affected ≤ 7.59.0
7.58.0 affected ≤ 7.58.0
7.57.0 affected ≤ 7.57.0
7.56.1 affected ≤ 7.56.1
7.56.0 affected ≤ 7.56.0
7.55.1 affected ≤ 7.55.1
7.55.0 affected ≤ 7.55.0
7.54.1 affected ≤ 7.54.1
7.54.0 affected ≤ 7.54.0
7.53.1 affected ≤ 7.53.1
7.53.0 affected ≤ 7.53.0
7.52.1 affected ≤ 7.52.1
7.52.0 affected ≤ 7.52.0
7.51.0 affected ≤ 7.51.0
7.50.3 affected ≤ 7.50.3
7.50.2 affected ≤ 7.50.2
7.50.1 affected ≤ 7.50.1
7.50.0 affected ≤ 7.50.0
7.49.1 affected ≤ 7.49.1
7.49.0 affected ≤ 7.49.0
7.48.0 affected ≤ 7.48.0
7.47.1 affected ≤ 7.47.1
7.47.0 affected ≤ 7.47.0
7.46.0 affected ≤ 7.46.0
7.45.0 affected ≤ 7.45.0
7.44.0 affected ≤ 7.44.0
7.43.0 affected ≤ 7.43.0
7.42.1 affected ≤ 7.42.1
7.42.0 affected ≤ 7.42.0
7.41.0 affected ≤ 7.41.0
7.40.0 affected ≤ 7.40.0
7.39.0 affected ≤ 7.39.0
7.38.0 affected ≤ 7.38.0
7.37.1 affected ≤ 7.37.1
7.37.0 affected ≤ 7.37.0
7.36.0 affected ≤ 7.36.0
7.35.0 affected ≤ 7.35.0
7.34.0 affected ≤ 7.34.0
7.33.0 affected ≤ 7.33.0
7.32.0 affected ≤ 7.32.0
7.31.0 affected ≤ 7.31.0
7.30.0 affected ≤ 7.30.0
7.29.0 affected ≤ 7.29.0
7.28.1 affected ≤ 7.28.1
7.28.0 affected ≤ 7.28.0
7.27.0 affected ≤ 7.27.0
7.26.0 affected ≤ 7.26.0
7.25.0 affected ≤ 7.25.0
7.24.0 affected ≤ 7.24.0
7.23.1 affected ≤ 7.23.1
7.23.0 affected ≤ 7.23.0
7.22.0 affected ≤ 7.22.0
7.21.7 affected ≤ 7.21.7
7.21.6 affected ≤ 7.21.6
7.21.5 affected ≤ 7.21.5
7.21.4 affected ≤ 7.21.4
7.21.3 affected ≤ 7.21.3
7.21.2 affected ≤ 7.21.2
7.21.1 affected ≤ 7.21.1
7.21.0 affected ≤ 7.21.0
7.20.1 affected ≤ 7.20.1
7.20.0 affected ≤ 7.20.0
7.19.7 affected ≤ 7.19.7
7.19.6 affected ≤ 7.19.6
7.19.5 affected ≤ 7.19.5
7.19.4 affected ≤ 7.19.4
7.19.3 affected ≤ 7.19.3
7.19.2 affected ≤ 7.19.2
7.19.1 affected ≤ 7.19.1
7.19.0 affected ≤ 7.19.0
7.18.2 affected ≤ 7.18.2
7.18.1 affected ≤ 7.18.1
7.18.0 affected ≤ 7.18.0
7.17.1 affected ≤ 7.17.1
7.17.0 affected ≤ 7.17.0
7.16.4 affected ≤ 7.16.4
7.16.3 affected ≤ 7.16.3
7.16.2 affected ≤ 7.16.2
7.16.1 affected ≤ 7.16.1
7.16.0 affected ≤ 7.16.0
7.15.5 affected ≤ 7.15.5
7.15.4 affected ≤ 7.15.4
7.15.3 affected ≤ 7.15.3
7.15.2 affected ≤ 7.15.2
7.15.1 affected ≤ 7.15.1
7.15.0 affected ≤ 7.15.0
7.14.1 affected ≤ 7.14.1
7.14.0 affected ≤ 7.14.0
7.13.2 affected ≤ 7.13.2
7.13.1 affected ≤ 7.13.1
7.13.0 affected ≤ 7.13.0
7.12.3 affected ≤ 7.12.3
7.12.2 affected ≤ 7.12.2
7.12.1 affected ≤ 7.12.1
7.12.0 affected ≤ 7.12.0
7.11.2 affected ≤ 7.11.2
7.11.1 affected ≤ 7.11.1
7.11.0 affected ≤ 7.11.0
7.10.8 affected ≤ 7.10.8
7.10.7 affected ≤ 7.10.7
7.10.6 affected ≤ 7.10.6

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://curl.se/docs/CVE-2026-11856.html cve-icon
https://curl.se/docs/CVE-2026-11856.json cve-icon
https://hackerone.com/reports/3793260 cve-icon
History

Fri, 03 Jul 2026 06:45:00 +0000

Type Values Removed Values Added
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`.
Title cross-origin Digest auth state leak
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published:

Updated: 2026-07-03T06:13:31.661Z

Reserved: 2026-06-10T08:59:16.646Z

Link: CVE-2026-11856

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.