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 9. CVE-2026-34043 involves the serialize-javascript component, 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 can also cause denial of service. Red Hat has released patched versions: .NET SDK 8.0.127 and .NET Runtime 8.0.27, which resolve these issues. The advisory covers multiple architectures including x86_64, s390x, ppc64le, and aarch64. No CVSS scores are provided in the advisory, and no known exploits have been reported.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions, potentially disrupting applications or services running on affected .NET versions on Red Hat Enterprise Linux 9. There is no indication of privilege escalation, data disclosure, or code execution. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated .NET SDK 8.0.127 and .NET Runtime 8.0.27 packages that fix these vulnerabilities. Users should apply these official updates promptly to remediate the denial of service issues. For detailed update instructions, refer to Red Hat's advisory at https://access.redhat.com/articles/11258. Since this is not a cloud service, remediation is the responsibility of the system administrators. 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.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Two denial of service vulnerabilities affect .NET 8.0 on Red Hat Enterprise Linux 9. CVE-2026-34043 involves the serialize-javascript component, 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 can also cause denial of service. Red Hat has released patched versions: .NET SDK 8.0.127 and .NET Runtime 8.0.27, which resolve these issues. The advisory covers multiple architectures including x86_64, s390x, ppc64le, and aarch64. No CVSS scores are provided in the advisory, and no known exploits have been reported.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions, potentially disrupting applications or services running on affected .NET versions on Red Hat Enterprise Linux 9. There is no indication of privilege escalation, data disclosure, or code execution. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated .NET SDK 8.0.127 and .NET Runtime 8.0.27 packages that fix these vulnerabilities. Users should apply these official updates promptly to remediate the denial of service issues. For detailed update instructions, refer to Red Hat's advisory at https://access.redhat.com/articles/11258. Since this is not a cloud service, remediation is the responsibility of the system administrators. 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-2026:21293
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-42899"]
- Cvss Version
- null
Threat ID: 6a18ab6ee29bf47b50288073
Added to database: 5/28/2026, 8:54:06 PM
Last enriched: 5/28/2026, 8:58:27 PM
Last updated: 5/29/2026, 8:17:19 AM
Views: 7
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