CVE-2026-11856 - Vulnerability Details - OpenCVE

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.

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References

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

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		https://curl.se/docs/CVE-2026-11856.html https://curl.se/docs/CVE-2026-11856.json https://hackerone.com/reports/3793260

MITRE

Status: PUBLISHED

Assigner: curl

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

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

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

Link: CVE-2026-11856

Vulnrichment

No data.

NVD

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Redhat

No data.

OpenCVE Enrichment

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{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-11856", "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "state": "PUBLISHED", "assignerShortName": "curl", "dateReserved": "2026-06-10T08:59:16.646Z", "datePublished": "2026-07-03T06:13:31.661Z", "dateUpdated": "2026-07-03T06:13:31.661Z"}, "containers": {"cna": {"title": "cross-origin Digest auth state leak", "descriptions": [{"lang": "en", "value": "Successfully using libcurl to do a transfer to a specific HTTP origin\n(`hostA`) with **Digest** authentication and then changing the origin to a\ndifferent one (`hostB`) for a second transfer, reusing the same handle, makes\nlibcurl wrongly pass on the `Authorization:` header field meant for `hostA`,\nto `hostB`."}], "providerMetadata": {"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "shortName": "curl", "dateUpdated": "2026-07-03T06:13:31.661Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-294 Authentication Bypass by 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