USN-8958-1 (UBUNTU-CVE-2026-102870)
Vulnerability from osv_ubuntu – Published: 2026-10-29 17:02 – Updated: 2026-10-31 00:28 – Source website
VLAI
Summary
dotnet8, dotnet10, dotnet11 vulnerabilities
Details
It was discovered that the .NET Blazor WebAssembly debug proxy did not properly escape certain values. An attacker could possibly use this issue to execute arbitrary code. The fix for this CVE was originally released via USN-8942-1, but it was found to be incomplete. This issue only affected dotnet10 and dotnet11. (CVE-2026-102870)
It was discovered that the Brotli decompression library used by .NET incorrectly handled certain compressed streams. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-111497)
Alen Cheung discovered that .NET did not properly handle file ownership in certain circumstances. An attacker could possibly use this issue to elevate local privileges. (CVE-2026-114148)
References
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"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-114148",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.10"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "aspnetcore-runtime-11.0",
"binary_version": "11.0.0~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "aspnetcore-runtime-dbg-11.0",
"binary_version": "11.0.0~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "aspnetcore-targeting-pack-11.0",
"binary_version": "11.0.0~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "dotnet-apphost-pack-11.0",
"binary_version": "11.0.0~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "dotnet-host-11.0",
"binary_version": "11.0.0~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "dotnet-hostfxr-11.0",
"binary_version": "11.0.0~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "dotnet-runtime-11.0",
"binary_version": "11.0.0~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "dotnet-runtime-dbg-11.0",
"binary_version": "11.0.0~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "dotnet-sdk-11.0",
"binary_version": "11.0.100~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "dotnet-sdk-11.0-source-built-artifacts",
"binary_version": "11.0.100~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "dotnet-sdk-aot-11.0",
"binary_version": "11.0.100~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "dotnet-sdk-dbg-11.0",
"binary_version": "11.0.100~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "dotnet-targeting-pack-11.0",
"binary_version": "11.0.0~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "dotnet-templates-11.0",
"binary_version": "11.0.100~rc3-0ubuntu1~26.10.1"
},
{
"binary_name": "dotnet11",
"binary_version": "11.0.100-11.0.0~rc3-0ubuntu1~26.10.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.10",
"name": "dotnet11",
"purl": "pkg:deb/ubuntu/dotnet11@11.0.100-11.0.0~rc3-0ubuntu1~26.10.1?arch=source\u0026distro=stonking"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "11.0.100-11.0.0~rc3-0ubuntu1~26.10.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"11.0.100-11.0.0~rc1-0ubuntu1",
"11.0.100-11.0.0~rc2-0ubuntu1~26.10.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-102870",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-111497",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-114148",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "aspnetcore-runtime-10.0",
"binary_version": "10.0.14-0ubuntu1~26.04.1"
},
{
"binary_name": "aspnetcore-runtime-dbg-10.0",
"binary_version": "10.0.14-0ubuntu1~26.04.1"
},
{
"binary_name": "aspnetcore-targeting-pack-10.0",
"binary_version": "10.0.14-0ubuntu1~26.04.1"
},
{
"binary_name": "dotnet-apphost-pack-10.0",
"binary_version": "10.0.14-0ubuntu1~26.04.1"
},
{
"binary_name": "dotnet-host-10.0",
"binary_version": "10.0.14-0ubuntu1~26.04.1"
},
{
"binary_name": "dotnet-hostfxr-10.0",
"binary_version": "10.0.14-0ubuntu1~26.04.1"
},
{
"binary_name": "dotnet-runtime-10.0",
"binary_version": "10.0.14-0ubuntu1~26.04.1"
},
{
"binary_name": "dotnet-runtime-dbg-10.0",
"binary_version": "10.0.14-0ubuntu1~26.04.1"
},
{
"binary_name": "dotnet-sdk-10.0",
"binary_version": "10.0.114-0ubuntu1~26.04.1"
},
{
"binary_name": "dotnet-sdk-10.0-source-built-artifacts",
"binary_version": "10.0.114-0ubuntu1~26.04.1"
},
{
"binary_name": "dotnet-sdk-aot-10.0",
"binary_version": "10.0.114-0ubuntu1~26.04.1"
},
{
"binary_name": "dotnet-sdk-dbg-10.0",
"binary_version": "10.0.114-0ubuntu1~26.04.1"
},
{
"binary_name": "dotnet-targeting-pack-10.0",
"binary_version": "10.0.14-0ubuntu1~26.04.1"
},
{
"binary_name": "dotnet-templates-10.0",
"binary_version": "10.0.114-0ubuntu1~26.04.1"
},
{
"binary_name": "dotnet10",
"binary_version": "10.0.114-10.0.14-0ubuntu1~26.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "dotnet10",
"purl": "pkg:deb/ubuntu/dotnet10@10.0.114-10.0.14-0ubuntu1~26.04.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "10.0.114-10.0.14-0ubuntu1~26.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"10.0.100-10.0.0~rc1-0ubuntu1",
"10.0.100-10.0.0~rc2-0ubuntu1",
"10.0.100-10.0.0-0ubuntu1",
"10.0.100-10.0.0-0ubuntu2",
"10.0.101-10.0.1-0ubuntu1",
"10.0.101-10.0.1-0ubuntu2",
"10.0.101-10.0.1-0ubuntu3",
"10.0.102-10.0.2-0ubuntu1",
"10.0.103-10.0.3-0ubuntu1",
"10.0.104-10.0.4-0ubuntu1",
"10.0.105-10.0.5-0ubuntu1",
"10.0.107-10.0.7-0ubuntu1~26.04.1",
"10.0.108-10.0.8-0ubuntu1~26.04.1",
"10.0.109-10.0.9-0ubuntu1~26.04.1",
"10.0.110-10.0.10-0ubuntu1~26.04.1",
"10.0.111-10.0.11-0ubuntu1~26.04.1",
"10.0.112-10.0.12-0ubuntu1~26.04.1",
"10.0.113-10.0.13-0ubuntu1~26.04.1"
]
}
],
"aliases": [],
"details": "It was discovered that the .NET Blazor WebAssembly debug proxy did not\nproperly escape certain values. An attacker could possibly use this issue\nto execute arbitrary code. The fix for this CVE was originally released via\nUSN-8942-1, but it was found to be incomplete. This issue only affected\ndotnet10 and dotnet11. (CVE-2026-102870)\n\nIt was discovered that the Brotli decompression library used by .NET\nincorrectly handled certain compressed streams. A remote attacker could\npossibly use this issue to cause a denial of service or execute arbitrary\ncode. (CVE-2026-111497)\n\nAlen Cheung discovered that .NET did not properly handle file ownership in\ncertain circumstances. An attacker could possibly use this issue to elevate\nlocal privileges. (CVE-2026-114148)",
"id": "USN-8958-1",
"modified": "2026-10-31T00:28:00Z",
"published": "2026-10-29T17:02:55Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8958-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-102870"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-111497"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-114148"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "dotnet8, dotnet10, dotnet11 vulnerabilities",
"upstream": [
"UBUNTU-CVE-2026-102870",
"UBUNTU-CVE-2026-111497",
"UBUNTU-CVE-2026-114148"
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.