FKIE_CVE-2026-11856
Vulnerability from fkie_nvd - Published: 2026-07-03 07:16 - Updated: 2026-07-03 07:16
Severity
Summary
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`.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "curl",
"vendor": "curl",
"versions": [
{
"lessThanOrEqual": "8.20.0",
"status": "affected",
"version": "8.20.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.19.0",
"status": "affected",
"version": "8.19.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.18.0",
"status": "affected",
"version": "8.18.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.17.0",
"status": "affected",
"version": "8.17.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.16.0",
"status": "affected",
"version": "8.16.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.15.0",
"status": "affected",
"version": "8.15.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.14.1",
"status": "affected",
"version": "8.14.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.14.0",
"status": "affected",
"version": "8.14.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.13.0",
"status": "affected",
"version": "8.13.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.12.1",
"status": "affected",
"version": "8.12.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.12.0",
"status": "affected",
"version": "8.12.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.11.1",
"status": "affected",
"version": "8.11.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.11.0",
"status": "affected",
"version": "8.11.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.10.1",
"status": "affected",
"version": "8.10.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.10.0",
"status": "affected",
"version": "8.10.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.9.1",
"status": "affected",
"version": "8.9.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.9.0",
"status": "affected",
"version": "8.9.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.8.0",
"status": "affected",
"version": "8.8.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.7.1",
"status": "affected",
"version": "8.7.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.7.0",
"status": "affected",
"version": "8.7.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.6.0",
"status": "affected",
"version": "8.6.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.5.0",
"status": "affected",
"version": "8.5.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.4.0",
"status": "affected",
"version": "8.4.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.3.0",
"status": "affected",
"version": "8.3.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.2.1",
"status": "affected",
"version": "8.2.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.2.0",
"status": "affected",
"version": "8.2.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.1.2",
"status": "affected",
"version": "8.1.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.1.1",
"status": "affected",
"version": "8.1.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.1.0",
"status": "affected",
"version": "8.1.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.0.1",
"status": "affected",
"version": "8.0.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "8.0.0",
"status": "affected",
"version": "8.0.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.88.1",
"status": "affected",
"version": "7.88.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.88.0",
"status": "affected",
"version": "7.88.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.87.0",
"status": "affected",
"version": "7.87.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.86.0",
"status": "affected",
"version": "7.86.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.85.0",
"status": "affected",
"version": "7.85.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.84.0",
"status": "affected",
"version": "7.84.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.83.1",
"status": "affected",
"version": "7.83.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.83.0",
"status": "affected",
"version": "7.83.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.82.0",
"status": "affected",
"version": "7.82.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.81.0",
"status": "affected",
"version": "7.81.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.80.0",
"status": "affected",
"version": "7.80.0",
"versionType": "semver"
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{
"lessThanOrEqual": "7.79.1",
"status": "affected",
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"versionType": "semver"
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{
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"status": "affected",
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"versionType": "semver"
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{
"lessThanOrEqual": "7.78.0",
"status": "affected",
"version": "7.78.0",
"versionType": "semver"
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{
"lessThanOrEqual": "7.77.0",
"status": "affected",
"version": "7.77.0",
"versionType": "semver"
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{
"lessThanOrEqual": "7.76.1",
"status": "affected",
"version": "7.76.1",
"versionType": "semver"
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{
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"status": "affected",
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"versionType": "semver"
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"status": "affected",
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"versionType": "semver"
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{
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"status": "affected",
"version": "7.74.0",
"versionType": "semver"
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{
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"status": "affected",
"version": "7.73.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.72.0",
"status": "affected",
"version": "7.72.0",
"versionType": "semver"
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{
"lessThanOrEqual": "7.71.1",
"status": "affected",
"version": "7.71.1",
"versionType": "semver"
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{
"lessThanOrEqual": "7.71.0",
"status": "affected",
"version": "7.71.0",
"versionType": "semver"
},
{
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"status": "affected",
"version": "7.70.0",
"versionType": "semver"
},
{
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"status": "affected",
"version": "7.69.1",
"versionType": "semver"
},
{
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"status": "affected",
"version": "7.69.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.68.0",
"status": "affected",
"version": "7.68.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.67.0",
"status": "affected",
"version": "7.67.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.66.0",
"status": "affected",
"version": "7.66.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.65.3",
"status": "affected",
"version": "7.65.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.65.2",
"status": "affected",
"version": "7.65.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.65.1",
"status": "affected",
"version": "7.65.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.65.0",
"status": "affected",
"version": "7.65.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.64.1",
"status": "affected",
"version": "7.64.1",
"versionType": "semver"
},
{
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"status": "affected",
"version": "7.64.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.63.0",
"status": "affected",
"version": "7.63.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.62.0",
"status": "affected",
"version": "7.62.0",
"versionType": "semver"
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{
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"status": "affected",
"version": "7.61.1",
"versionType": "semver"
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{
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{
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"status": "affected",
"version": "7.59.0",
"versionType": "semver"
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{
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"status": "affected",
"version": "7.58.0",
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{
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"status": "affected",
"version": "7.57.0",
"versionType": "semver"
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{
"lessThanOrEqual": "7.56.1",
"status": "affected",
"version": "7.56.1",
"versionType": "semver"
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{
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"status": "affected",
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"versionType": "semver"
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{
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"status": "affected",
"version": "7.55.1",
"versionType": "semver"
},
{
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"status": "affected",
"version": "7.55.0",
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{
"lessThanOrEqual": "7.54.1",
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"versionType": "semver"
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"versionType": "semver"
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{
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"status": "affected",
"version": "7.43.0",
"versionType": "semver"
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{
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"status": "affected",
"version": "7.42.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.42.0",
"status": "affected",
"version": "7.42.0",
"versionType": "semver"
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{
"lessThanOrEqual": "7.41.0",
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"version": "7.41.0",
"versionType": "semver"
},
{
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"version": "7.40.0",
"versionType": "semver"
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{
"lessThanOrEqual": "7.39.0",
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"versionType": "semver"
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{
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"versionType": "semver"
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{
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"versionType": "semver"
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"versionType": "semver"
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{
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"versionType": "semver"
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{
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"versionType": "semver"
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{
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{
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{
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{
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{
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{
"lessThanOrEqual": "7.15.0",
"status": "affected",
"version": "7.15.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.14.1",
"status": "affected",
"version": "7.14.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.14.0",
"status": "affected",
"version": "7.14.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.13.2",
"status": "affected",
"version": "7.13.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.13.1",
"status": "affected",
"version": "7.13.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.13.0",
"status": "affected",
"version": "7.13.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.3",
"status": "affected",
"version": "7.12.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.2",
"status": "affected",
"version": "7.12.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.1",
"status": "affected",
"version": "7.12.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.12.0",
"status": "affected",
"version": "7.12.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.11.2",
"status": "affected",
"version": "7.11.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.11.1",
"status": "affected",
"version": "7.11.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.11.0",
"status": "affected",
"version": "7.11.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.8",
"status": "affected",
"version": "7.10.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.7",
"status": "affected",
"version": "7.10.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.10.6",
"status": "affected",
"version": "7.10.6",
"versionType": "semver"
}
]
}
],
"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
}
],
"cveTags": [],
"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`."
}
],
"id": "CVE-2026-11856",
"lastModified": "2026-07-03T07:16:23.973",
"metrics": {},
"published": "2026-07-03T07:16:23.973",
"references": [
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"url": "https://curl.se/docs/CVE-2026-11856.html"
},
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"url": "https://curl.se/docs/CVE-2026-11856.json"
},
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"url": "https://hackerone.com/reports/3793260"
}
],
"sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9",
"vulnStatus": "Received"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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