Vulnerability-Lookup

MSRC_CVE-2026-42899

Vulnerability from csaf_microsoft - Published: 2026-05-12 07:00 - Updated: 2026-05-12 07:00

Summary

ASP.NET Core Denial of Service Vulnerability

Severity

Important

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

Customer Action: Required. The vulnerability documented by this CVE requires customer action to resolve.

CVE-2026-42899

7.5 (High)


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

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Affected products

Fixed 9 products

Product	Identifier	Version	Remediation
.NET 8.0 installed on Windows 8.0.27 .NET 8.0 installed on Windows		8.0.27
.NET 8.0 installed on Linux 8.0.27 .NET 8.0 installed on Linux		8.0.27
.NET 8.0 installed on Mac OS 8.0.27 .NET 8.0 installed on Mac OS		8.0.27
.NET 9.0 installed on Linux 9.0.16 .NET 9.0 installed on Linux		9.0.16
.NET 9.0 installed on Mac OS 9.0.16 .NET 9.0 installed on Mac OS		9.0.16
.NET 9.0 installed on Windows 9.0.16 .NET 9.0 installed on Windows		9.0.16
.NET 10.0 installed on Windows 10.0.8 .NET 10.0 installed on Windows		10.0.8
.NET 10.0 installed on Mac OS 10.0.8 .NET 10.0 installed on Mac OS		10.0.8
.NET 10.0 installed on Linux 10.0.8 .NET 10.0 installed on Linux		10.0.8

Known affected 9 products

Product	Version	Remediation
.NET 10.0 installed on Linux <10.0.8 .NET 10.0 installed on Linux	<10.0.8	Vendor Fix fix
.NET 10.0 installed on Mac OS <10.0.8 .NET 10.0 installed on Mac OS	<10.0.8	Vendor Fix fix
.NET 10.0 installed on Windows <10.0.8 .NET 10.0 installed on Windows	<10.0.8	Vendor Fix fix
.NET 9.0 installed on Windows <9.0.16 .NET 9.0 installed on Windows	<9.0.16	Vendor Fix fix
.NET 9.0 installed on Mac OS <9.0.16 .NET 9.0 installed on Mac OS	<9.0.16	Vendor Fix fix
.NET 9.0 installed on Linux <9.0.16 .NET 9.0 installed on Linux	<9.0.16	Vendor Fix fix
.NET 8.0 installed on Mac OS <8.0.27 .NET 8.0 installed on Mac OS	<8.0.27	Vendor Fix fix
.NET 8.0 installed on Linux <8.0.27 .NET 8.0 installed on Linux	<8.0.27	Vendor Fix fix
.NET 8.0 installed on Windows <8.0.27 .NET 8.0 installed on Windows	<8.0.27	Vendor Fix fix

Threats

Impact Denial of Service

Exploit Status Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Unlikely

References

7 references

URL	Category
https://msrc.microsoft.com/update-guide/vulnerabi…	self
https://msrc.microsoft.com/csaf/advisories/2026/m…	self
https://www.microsoft.com/en-us/msrc/exploitabili…	external
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/update-guide/vulnerabi…	self
https://msrc.microsoft.com/csaf/advisories/2026/m…	self

Acknowledgments

hamayanhamayan

<a href="https://www.linkedin.com/in/abdul-rehman---/">Muhammad Abdul Rehman</a>

JSON

To clipboard

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}

CVE-2026-42899 (GCVE-0-2026-42899)

Vulnerability from cvelistv5 – Published: 2026-05-12 16:59 – Updated: 2026-08-10 15:13

Title

ASP.NET Core Denial of Service Vulnerability

Summary

Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny service over a network.

Severity

7.5 (High)


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

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-12 20:10 UTC

CWE

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Assigner

microsoft CNA under the mitre root

CNA scorecard B 82/100 over 4926 records in the last 180 days details

References

21 references

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch
https://access.redhat.com/security/cve/CVE-2026-42899	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2476605	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:24332	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:24333	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22145	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21286	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21754	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21295	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21291	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21294	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:24334	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:24335	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:24336	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21297	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21293	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21296	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17464	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17682	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17527	vendor-advisoryx_refsource_REDHAT

Impacted products

20 products

Vendor	Product	Version
Microsoft	.NET 10.0	Affected: 10.0.0 , < 10.0.8 (custom)
Microsoft	.NET 8.0	Affected: 8.0.0 , < 8.0.27 (custom)
Microsoft	.NET 9.0	Affected: 9.0.0 , < 9.0.16 (custom)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:8.0.127-1.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:9.0.117-1.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:10.0.108-1.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	Unaffected: 0:8.0.127-1.el10_0 , < * (rpm) cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	Unaffected: 0:9.0.117-1.el10_0 , < * (rpm) cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:8.0.127-1.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:9.0.117-1.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:10.0.108-1.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:8.0.127-1.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:9.0.117-1.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:10.0.108-1.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	Unaffected: 0:8.0.127-1.el9_4 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.4
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 0:8.0.127-1.el9_6 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 0:9.0.117-1.el9_6 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6
Red Hat	Red Hat Hardened Images	Unaffected: 10.0.108-1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Hardened Images	Unaffected: 9.0.117-1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Hardened Images	Unaffected: 8.0.127-1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1

Date Public

2026-05-12 14:00

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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MSRC_CVE-2026-42899

CVE-2026-42899 (GCVE-0-2026-42899)

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