HighFix available
Red Hat Security Advisory: .NET 8.0 security update
Type: advisorySources: OSV
- Products
- aspnetcore-runtime-8.0, aspnetcore-runtime-dbg-8.0, aspnetcore-targeting-pack-8.0, dotnet-apphost-pack-8.0, dotnet-apphost-pack-8.0-debuginfo, dotnet-hostfxr-8.0, dotnet-hostfxr-8.0-debuginfo, dotnet-runtime-8.0, dotnet-runtime-8.0-debuginfo, dotnet-runtime-dbg-8.0, dotnet-sdk-8.0, dotnet-sdk-8.0-debuginfo, dotnet-sdk-8.0-source-built-artifacts, dotnet-sdk-dbg-8.0, dotnet-targeting-pack-8.0, dotnet-templates-8.0, dotnet8.0, dotnet8.0-debugsource
- Affected versions
- Not specified
- Fixed versions
- 0:8.0.127-1.el10_2, 0:8.0.27-1.el10_2
- CVEs
- CVE-2026-34043, CVE-2026-42899
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 12:31 UTC · Revision 1
Source evidence
Red Hat Security Advisory: .NET 8.0 security update
core-osv · Original sourcePublished 28 May 2026, 10:07 UTC
Red Hat Security Advisory: .NET 8.0 security update
osv:RHSA-2026:21286
aspnetcore-runtime-8.0
Fixed versions: 0:8.0.27-1.el10_2
aspnetcore-runtime-dbg-8.0
Fixed versions: 0:8.0.27-1.el10_2
aspnetcore-targeting-pack-8.0
Fixed versions: 0:8.0.27-1.el10_2
dotnet-apphost-pack-8.0
Fixed versions: 0:8.0.27-1.el10_2
dotnet-apphost-pack-8.0-debuginfo
Fixed versions: 0:8.0.27-1.el10_2
dotnet-hostfxr-8.0
Fixed versions: 0:8.0.27-1.el10_2
dotnet-hostfxr-8.0-debuginfo
Fixed versions: 0:8.0.27-1.el10_2
dotnet-runtime-8.0
Fixed versions: 0:8.0.27-1.el10_2
dotnet-runtime-8.0-debuginfo
Fixed versions: 0:8.0.27-1.el10_2
dotnet-runtime-dbg-8.0
Fixed versions: 0:8.0.27-1.el10_2
dotnet-sdk-8.0
Fixed versions: 0:8.0.127-1.el10_2
dotnet-sdk-8.0-debuginfo
Fixed versions: 0:8.0.127-1.el10_2
dotnet-sdk-dbg-8.0
Fixed versions: 0:8.0.127-1.el10_2
dotnet-targeting-pack-8.0
Fixed versions: 0:8.0.27-1.el10_2
dotnet-templates-8.0
Fixed versions: 0:8.0.127-1.el10_2
dotnet8.0
Fixed versions: 0:8.0.127-1.el10_2
dotnet8.0-debugsource
Fixed versions: 0:8.0.127-1.el10_2
dotnet-sdk-8.0-source-built-artifacts
Fixed versions: 0:8.0.127-1.el10_2
Complete source record
{
"id": "d947ea628ba76f67323219ac9d2a90380a7f75a78060e3c69a045ea652a10922",
"url": "https://osv.dev/vulnerability/RHSA-2026%3A21286",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Red Hat Security Advisory: .NET 8.0 security update",
"summary": "Red Hat Security Advisory: .NET 8.0 security update",
"evidence": "osv:RHSA-2026:21286",
"products": [
{
"name": {
"value": "aspnetcore-runtime-8.0",
"evidence": "/affected/0/package/name"
},
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{
"value": "0:8.0.27-1.el10_2",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
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{
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"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
"prerequisites": [],
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{
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}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
"prerequisites": [],
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{
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"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0:8.0.27-1.el10_2",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet-hostfxr-8.0",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet-hostfxr-8.0-debuginfo",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet-runtime-8.0",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0:8.0.27-1.el10_2",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet-runtime-8.0-debuginfo",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0:8.0.27-1.el10_2",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet-runtime-dbg-8.0",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0:8.0.27-1.el10_2",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet-sdk-8.0",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0:8.0.127-1.el10_2",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet-sdk-8.0-debuginfo",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0:8.0.127-1.el10_2",
"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet-sdk-dbg-8.0",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0:8.0.127-1.el10_2",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet-targeting-pack-8.0",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0:8.0.27-1.el10_2",
"evidence": "/affected/13/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet-templates-8.0",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0:8.0.127-1.el10_2",
"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet8.0",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0:8.0.127-1.el10_2",
"evidence": "/affected/15/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet8.0-debugsource",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0:8.0.127-1.el10_2",
"evidence": "/affected/16/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dotnet-sdk-8.0-source-built-artifacts",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0:8.0.127-1.el10_2",
"evidence": "/affected/17/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "RHSA-2026:21286",
"aliases": [
"RHSA-2026:21286"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0:8.0.27-1.el10_2"
}
]
}
],
"package": {
"name": "aspnetcore-runtime-8.0",
"purl": "pkg:rpm/redhat/aspnetcore-runtime-8.0",
"ecosystem": "Red Hat:enterprise_linux:10.2"
},
"database_specific": {
"source": "https://security.access.redhat.com/data/osv/RHSA-2026:21286.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
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}
]
}
],
"package": {
"name": "aspnetcore-runtime-dbg-8.0",
"purl": "pkg:rpm/redhat/aspnetcore-runtime-dbg-8.0",
"ecosystem": "Red Hat:enterprise_linux:10.2"
},
"database_specific": {
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],
"package": {
"name": "aspnetcore-targeting-pack-8.0",
"purl": "pkg:rpm/redhat/aspnetcore-targeting-pack-8.0",
"ecosystem": "Red Hat:enterprise_linux:10.2"
},
"database_specific": {
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},
{
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],
"package": {
"name": "dotnet-apphost-pack-8.0",
"purl": "pkg:rpm/redhat/dotnet-apphost-pack-8.0",
"ecosystem": "Red Hat:enterprise_linux:10.2"
},
"database_specific": {
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}
},
{
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],
"package": {
"name": "dotnet-apphost-pack-8.0-debuginfo",
"purl": "pkg:rpm/redhat/dotnet-apphost-pack-8.0-debuginfo",
"ecosystem": "Red Hat:enterprise_linux:10.2"
},
"database_specific": {
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{
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"package": {
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"purl": "pkg:rpm/redhat/dotnet-hostfxr-8.0",
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],
"package": {
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],
"package": {
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"purl": "pkg:rpm/redhat/dotnet-sdk-8.0-debuginfo",
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},
"database_specific": {
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{
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],
"package": {
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],
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"package": {
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"purl": "pkg:rpm/redhat/dotnet-templates-8.0",
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]
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],
"package": {
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"purl": "pkg:rpm/redhat/dotnet8.0-debugsource",
"ecosystem": "Red Hat:enterprise_linux:10.2"
},
"database_specific": {
"source": "https://security.access.redhat.com/data/osv/RHSA-2026:21286.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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{
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]
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],
"package": {
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"purl": "pkg:rpm/redhat/dotnet-sdk-8.0-source-built-artifacts",
"ecosystem": "Red Hat:enterprise_linux:10.2"
},
"database_specific": {
"source": "https://security.access.redhat.com/data/osv/RHSA-2026:21286.json"
}
}
],
"modified": "2026-10-09T10:22:01Z",
"provider": "osv",
"upstream": [
"CVE-2026-34043",
"CVE-2026-42899"
],
"references": [
"https://access.redhat.com/errata/RHSA-2026:21286",
"https://access.redhat.com/security/updates/classification/#important",
"https://bugzilla.redhat.com/show_bug.cgi?id=2453284",
"https://bugzilla.redhat.com/show_bug.cgi?id=2476605",
"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_21286.json",
"https://access.redhat.com/security/cve/CVE-2026-34043",
"https://www.cve.org/CVERecord?id=CVE-2026-34043",
"https://nvd.nist.gov/vuln/detail/CVE-2026-34043",
"https://github.com/yahoo/serialize-javascript/commit/f147e90269b58bb6e539cfdf3d0e20d6ad14204b",
"https://github.com/yahoo/serialize-javascript/releases/tag/v7.0.5",
"https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6v",
"https://access.redhat.com/security/cve/CVE-2026-42899",
"https://www.cve.org/CVERecord?id=CVE-2026-42899",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42899",
"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42899"
]
},
"related_cves": [
{
"value": "CVE-2026-34043",
"evidence": "/upstream"
},
{
"value": "CVE-2026-42899",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 120563,
"published_at": "2026-05-28T10:07:38+00:00"
}