CVE-2026-11856

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Source
https://cve.org/CVERecord?id=CVE-2026-11856
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-11856.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-11856
Aliases
Downstream
Related
Published
2026-07-03T06:13:31Z
Modified
2026-09-10T03:47:21Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
cross-origin Digest auth state leak
Details

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.

Database specific 
{
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    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11856.json",
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    ]
}
References

Affected packages

Git / github.com/curl/curl

Affected ranges

Type
GIT
Repo
https://github.com/curl/curl
Events
Introduced
bdb5e5a25037a585e0ec6b83d29b25961c6823f8
Fixed
3f00a2f6fa97f7721b65606954aac979dcb6caac
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "7.10.6"
        },
        {
            "fixed": "8.21.0"
        }
    ],
    "source": "CPE_RANGE"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-11856.json"