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: CVE-2026-34043 involves denial of service via specially crafted array-like object serialization in the serialize-javascript component, and CVE-2026-42899 involves an infinite loop in the .NET runtime that can be triggered by an attacker. Red Hat has issued security updates in .NET SDK 8.0.127 and .NET Runtime 8.0.27 to fix these issues. The vulnerabilities are rated as Important severity by Red Hat. The affected platforms include various architectures of Red Hat Enterprise Linux 8 and related CodeReady Linux Builder variants.
Potential Impact
Successful exploitation of these vulnerabilities could cause denial of service conditions on affected systems running .NET 8.0, potentially disrupting applications or services relying on the framework. There are no reports of active exploitation in the wild. The impact is limited to service availability degradation due to denial of service.
Mitigation Recommendations
Red Hat has released updated .NET SDK 8.0.127 and .NET Runtime 8.0.27 packages that address these vulnerabilities. Users should apply these official updates as detailed in the Red Hat advisory (RHSA-2026:21291) and the referenced article https://access.redhat.com/articles/11258. No additional mitigation steps are indicated by the vendor advisory. Patch status is confirmed as fixed 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.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Two denial of service vulnerabilities affect .NET 8.0 on Red Hat Enterprise Linux: CVE-2026-34043 involves denial of service via specially crafted array-like object serialization in the serialize-javascript component, and CVE-2026-42899 involves an infinite loop in the .NET runtime that can be triggered by an attacker. Red Hat has issued security updates in .NET SDK 8.0.127 and .NET Runtime 8.0.27 to fix these issues. The vulnerabilities are rated as Important severity by Red Hat. The affected platforms include various architectures of Red Hat Enterprise Linux 8 and related CodeReady Linux Builder variants.
Potential Impact
Successful exploitation of these vulnerabilities could cause denial of service conditions on affected systems running .NET 8.0, potentially disrupting applications or services relying on the framework. There are no reports of active exploitation in the wild. The impact is limited to service availability degradation due to denial of service.
Mitigation Recommendations
Red Hat has released updated .NET SDK 8.0.127 and .NET Runtime 8.0.27 packages that address these vulnerabilities. Users should apply these official updates as detailed in the Red Hat advisory (RHSA-2026:21291) and the referenced article https://access.redhat.com/articles/11258. No additional mitigation steps are indicated by the vendor advisory. Patch status is confirmed as fixed 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-2026:21291
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-42899"]
- Cvss Version
- null
Threat ID: 6a18ab6fe29bf47b50288354
Added to database: 5/28/2026, 8:54:07 PM
Last enriched: 5/28/2026, 8:58:33 PM
Last updated: 5/29/2026, 8:30:59 AM
Views: 4
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