ESB-2026.4121 — Vulnetix

ESB-2026.4121 PUBLISHED CVSS 7.5 HIGH

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4121 .NET 9.0 security update 24 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: .NET 9.0 Publisher: Red Hat Operating System: Red Hat Resolution: Patch/Upgrade CVE Names: CVE-2026-26127 CVE-2026-26130 Original Bulletin: https://access.redhat.com/errata/RHSA-2026:10083 Comment: CVSS (Max): 7.5 CVE-2026-26130 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVSS Source: Red Hat Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H EPSS (Max): 3.5% (87th) CVE-2026-26130 2026-04-22 - --------------------------BEGIN INCLUDED TEXT-------------------- RHSA-2026:10083 - Security Advisory Issued: 2026-04-23 Updated: 2026-04-23 Synopsis .net 9.0 security update Type/Severity Security Advisory: Important Topic An update for .NET 9.0 is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. 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 9.0.115 and .NET Runtime 9.0.14.Security Fix (es): o .net: .NET: Denial of Service via out-of-bounds read (CVE-2026-26127) o asp.net: ASP.NET Core: Denial of Service via uncontrolled resource allocation (CVE-2026-26130) 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. Solution For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Affected Products o Red Hat Enterprise Linux for x86_64 - Extended Update Support 10.0 x86_64 o Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.0 s390x o Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.0 ppc64le o Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.0 aarch64 o Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 10.0 x86_64 o Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 10.0 ppc64le o Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support 10.0 s390x o Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 10.0 aarch64 o Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.0 aarch64 o Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.0 s390x o Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.0 ppc64le o Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.0 x86_64 Fixes o BZ - 2446098 - CVE-2026-26127 .net: .NET: Denial of Service via out-of-bounds read o BZ - 2446134 - CVE-2026-26130 asp.net: ASP.NET Core: Denial of Service via uncontrolled resource allocation CVEs o CVE-2026-26127 o CVE-2026-26130 References o https://access.redhat.com/security/updates/classification/#important - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================

Risk Scores

CVSS v3.1

7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
Red Hat	.NET 9.0

Timeline

Apr 24, 2026 CVE Published
Apr 24, 2026 Distribution Patch

References

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