CVE-2026-42899 (GCVE-0-2026-42899)
Vulnerability from cvelistv5 – Published: 2026-05-12 16:59 – Updated: 2026-08-10 15:13
VLAI
EPSS
VEX
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
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
References
21 references
Impacted products
20 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Microsoft | .NET 10.0 |
Affected:
10.0.0 , < 10.0.8
(custom)
|
guessed | |
| Microsoft | .NET 8.0 |
Affected:
8.0.0 , < 8.0.27
(custom)
|
guessed | |
| Microsoft | .NET 9.0 |
Affected:
9.0.0 , < 9.0.16
(custom)
|
guessed | |
| 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
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"versionStartIncluding": "10.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"datePublic": "2026-05-12T14:00:00.000Z",
"descriptions": [
{
"lang": "en-US",
"value": "Loop with unreachable exit condition (\u0027infinite loop\u0027) in ASP.NET Core allows an unauthorized attacker to deny service over a network."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "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",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en-US",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-835",
"description": "CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
"lang": "en-US",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-19T16:12:39.222Z",
"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
},
"references": [
{
"name": "ASP.NET Core Denial of Service Vulnerability",
"tags": [
"vendor-advisory",
"patch"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42899"
}
],
"title": "ASP.NET Core Denial of Service Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"assignerShortName": "microsoft",
"cveId": "CVE-2026-42899",
"datePublished": "2026-05-12T16:59:06.838Z",
"dateReserved": "2026-04-30T22:35:54.967Z",
"dateUpdated": "2026-06-19T16:12:39.222Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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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Related by attack behaviour
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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