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
.NET 8.0 on Red Hat Enterprise Linux 10 includes a subset of .NET framework APIs and a CLR implementation. Two denial of service vulnerabilities have been identified: CVE-2026-34043 in the serialize-javascript library allows denial of service via serialization of specially crafted array-like objects; CVE-2026-42899 involves an infinite loop in .NET that can be exploited to cause denial of service. Red Hat has released updated .NET SDK 8.0.127 and Runtime 8.0.27 packages to address these vulnerabilities. The advisory covers multiple architectures including x86_64, s390x, ppc64le, and aarch64. The vendor rates the security impact as Important and provides detailed update instructions. No CVSS scores or known exploits are currently available.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions on affected systems running .NET 8.0 on Red Hat Enterprise Linux 10. This could disrupt availability of applications relying on the .NET framework. There are no reports of active exploitation in the wild. The impact is limited to denial of service; no code execution or data breach is indicated.
Mitigation Recommendations
Red Hat has released updated .NET SDK 8.0.127 and Runtime 8.0.27 packages that fix these vulnerabilities. Users should apply these official updates promptly to remediate the issues. Detailed update instructions are available in the Red Hat advisory at https://access.redhat.com/articles/11258. No other mitigation steps are indicated or required 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
.NET 8.0 on Red Hat Enterprise Linux 10 includes a subset of .NET framework APIs and a CLR implementation. Two denial of service vulnerabilities have been identified: CVE-2026-34043 in the serialize-javascript library allows denial of service via serialization of specially crafted array-like objects; CVE-2026-42899 involves an infinite loop in .NET that can be exploited to cause denial of service. Red Hat has released updated .NET SDK 8.0.127 and Runtime 8.0.27 packages to address these vulnerabilities. The advisory covers multiple architectures including x86_64, s390x, ppc64le, and aarch64. The vendor rates the security impact as Important and provides detailed update instructions. No CVSS scores or known exploits are currently available.
Potential Impact
Successful exploitation of these vulnerabilities can cause denial of service conditions on affected systems running .NET 8.0 on Red Hat Enterprise Linux 10. This could disrupt availability of applications relying on the .NET framework. There are no reports of active exploitation in the wild. The impact is limited to denial of service; no code execution or data breach is indicated.
Mitigation Recommendations
Red Hat has released updated .NET SDK 8.0.127 and Runtime 8.0.27 packages that fix these vulnerabilities. Users should apply these official updates promptly to remediate the issues. Detailed update instructions are available in the Red Hat advisory at https://access.redhat.com/articles/11258. No other mitigation steps are indicated or required 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"]
- Cvss Version
- null
Threat ID: 6a18ab6fe29bf47b5028835b
Added to database: 5/28/2026, 8:54:07 PM
Last enriched: 5/28/2026, 8:58:42 PM
Last updated: 5/29/2026, 8:17:20 AM
Views: 4
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