Red Hat Security Advisory: .NET 8.0 security update
.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation. New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.127 and .NET Runtime 8.0.27.Security Fix(es): * serialize-javascript: serialize-javascript: Denial of Service via specially crafted array-like object serialization (CVE-2026-34043) * dotnet: .NET: infinite loop allows an attacker to cause a denial of service (CVE-2026-42899) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
AI Analysis
Technical Summary
Two denial of service vulnerabilities affect .NET 8.0 on Red Hat Enterprise Linux 10. CVE-2026-34043 involves the serialize-javascript library, where specially crafted array-like objects can cause a denial of service during serialization. CVE-2026-42899 is an infinite loop vulnerability in the .NET runtime that allows an attacker to cause a denial of service. Red Hat has released updated packages (SDK 8.0.127 and Runtime 8.0.27) that fix these issues.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions by making the .NET runtime or applications enter infinite loops or crash during serialization. This can disrupt availability of services relying on .NET 8.0 on affected Red Hat Enterprise Linux 10 systems.
Mitigation Recommendations
Red Hat has released official security updates for .NET SDK 8.0.127 and .NET Runtime 8.0.27 that address these vulnerabilities. Users should apply these updates promptly following Red Hat's guidance at https://access.redhat.com/articles/11258. No additional mitigations are specified by the vendor.
Red Hat Security Advisory: .NET 8.0 security update
Description
.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation. New versions of .NET that address a security vulnerability are now available. The updated versions are .NET SDK 8.0.127 and .NET Runtime 8.0.27.Security Fix(es): * serialize-javascript: serialize-javascript: Denial of Service via specially crafted array-like object serialization (CVE-2026-34043) * dotnet: .NET: infinite loop allows an attacker to cause a denial of service (CVE-2026-42899) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Two denial of service vulnerabilities affect .NET 8.0 on Red Hat Enterprise Linux 10. CVE-2026-34043 involves the serialize-javascript library, where specially crafted array-like objects can cause a denial of service during serialization. CVE-2026-42899 is an infinite loop vulnerability in the .NET runtime that allows an attacker to cause a denial of service. Red Hat has released updated packages (SDK 8.0.127 and Runtime 8.0.27) that fix these issues.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions by making the .NET runtime or applications enter infinite loops or crash during serialization. This can disrupt availability of services relying on .NET 8.0 on affected Red Hat Enterprise Linux 10 systems.
Mitigation Recommendations
Red Hat has released official security updates for .NET SDK 8.0.127 and .NET Runtime 8.0.27 that address these vulnerabilities. Users should apply these updates promptly following Red Hat's guidance at https://access.redhat.com/articles/11258. No additional mitigations are specified by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:21286
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-42899"]
- State
- PUBLISHED
Threat ID: 6a18ab6fe29bf47b5028835b
Added to database: 05/28/2026, 20:54:07 UTC
Last enriched: 08/10/2026, 20:18:45 UTC
Last updated: 09/12/2026, 10:01:30 UTC
Views: 84
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