CVE-2026-70162
published 2026-10-13CVE-2026-70162: A denial of service vulnerability exists when Microsoft Common Object Runtime Library improperly handles web requests. An attacker who successfully exploited…
PriorityP434medium5.9CVSS 3.1
AVNACHPRNUINSUCNINAH
EPSS
0.77%
55.1th percentile
A denial of service vulnerability exists when Microsoft Common Object Runtime Library improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET web application.
A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the .NET application.
The update addresses the vulnerability by correcting how the .NET web application handles web requests.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft_visual_studio_2022_version_17.14 | >= 17.14.0 < 17.14.42 | 17.14.42 |
| microsoft | microsoft_visual_studio_2026_version_18.10 | >= 18.10.0 < 18.10.4 | 18.10.4 |
| microsoft | system.security.cryptography.pkcs | >= 10.0.0 < 10.0.13 | 10.0.13 |
| microsoft | system.security.cryptography.pkcs | >= 10.0.0 < 10.0.13 | 10.0.13 |
| microsoft | system.security.cryptography.pkcs | >= 11.0.0-preview.1 < 11.0.0-rc.2 | 11.0.0-rc.2 |
| microsoft | system.security.cryptography.pkcs | >= 8.0.0 < 8.0.2 | 8.0.2 |
| microsoft | system.security.cryptography.pkcs | >= 9.0.0 < 9.0.21 | 9.0.21 |
CVSS provenance
nvdv3.15.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
ghsa5.9MEDIUM
vendor_redhat5.9MEDIUM
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GHSA
Microsoft Security Advisory CVE-2026-70162 - .NET Denial of Service Vulnerability
ghsa·2026-10-13·CVSS 5.9
CVE-2026-70162 [MEDIUM] CWE-405 Microsoft Security Advisory CVE-2026-70162 - .NET Denial of Service Vulnerability
Microsoft Security Advisory CVE-2026-70162 - .NET Denial of Service Vulnerability
## Executive summary
Microsoft is releasing this security advisory to provide information about a vulnerability in System.Security.Cryptography.Pkcs. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
On Windows, `EnvelopedCms.Decode` can perform quadratic work while processing attacker-supplied CMS or PKCS#7 attributes, causing pre-authentication CPU exhaustion.
## Announcement
Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/454
## CVSS Details
- **Version:** 3.1
- **Severity:** Moderate
- **Score:** 5.9
- **Vector:** `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`
- **Weakness:** CWE-405 (
Red Hat
dotnet: dotnet: Denial of Service via specially crafted web requests
vendor_redhat·2026-10-13·CVSS 5.9
CVE-2026-70162 [MEDIUM] CWE-770 dotnet: dotnet: Denial of Service via specially crafted web requests
dotnet: dotnet: Denial of Service via specially crafted web requests
A denial of service vulnerability exists when Microsoft Common Object Runtime Library improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET web application.
A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the .NET application.
The update addresses the vulnerability by correcting how the .NET web application handles web requests.
A flaw was found in dotnet. The Microsoft Common Object Runtime Library improperly handles incoming web requests. A remote, unauthenticated attacker could exploit this vulnerability by sending specially crafted web requests to an affected application, re
No detection rules found.
No public exploits indexed.
Sans Isc
October 2026 Microsoft Patch Tuesday, (Tue, Oct 13th)
blogs_sans_isc·2026-10-13·CVSS 8.8
CVE-2026-96951 [HIGH] October 2026 Microsoft Patch Tuesday, (Tue, Oct 13th)
October 2026 Microsoft Patch Tuesday
Published: 2026-10-13. Last Updated: 2026-10-13 19:25:52 UTC
by Johannes Ullrich (Version: 1)
0 comment(s)
Microsoft today released patches for 1,417 vulnerabilities. 76 of these vulnerabilities are rated critical, with 7 critical vulnerabiilties requiring no customer actions. One vulnerability was disclosed before today's patch Tuesday, and one is already exploited.
CVE-2026-96951: An already exploited Windows Shell Security Feature Bypass Vulnerability. This vulnerabliity allows bypassing the "Mark of the Web" making it easier to exeucte code by sending a malicious message to a user via e-mail or instant messaging. The victim will still have to open the file.
CVE-2026-108398: This vulnerability, a .NET framework security feature bypass, could be
Rapid7
Patch Tuesday - October 2026
blogs_rapid7·2026-10-13·CVSS 8.8
CVE-2026-96951 [HIGH] Patch Tuesday - October 2026
Microsoft is publishing 1,413 own-product vulnerabilities on October 2026 Patch Tuesday , including 1,102 vulnerabilities in Windows. Anyone who enjoyed last month’s record-setting Patch Tuesday will love the October 2026 edition, because it’s much bigger still. As Rapid7 has noted over the course of 2026, there is every reason to suppose that vulnerability volumes will continue to rise. Microsoft is aware of exploitation in the wild for just one of the vulnerabilities published today, as well as public disclosure for two others.
## Windows Shell: zero-day security feature bypass
The Windows Shell is Microsoft’s term for the GUI interaction logic for the entire OS provided by explorer.exe and associated libraries and APIs, and for the second time this year , the Windows Shell is the site
Bugzilla
CVE-2026-70162 dotnet: dotnet: Denial of Service via specially crafted web requests
bugzilla·2026-10-13·CVSS 5.9
CVE-2026-70162 [MEDIUM] CVE-2026-70162 dotnet: dotnet: Denial of Service via specially crafted web requests
CVE-2026-70162 dotnet: dotnet: Denial of Service via specially crafted web requests
A denial of service vulnerability exists when Microsoft Common Object Runtime Library improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET web application.
A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the .NET application.
The update addresses the vulnerability by correcting how the .NET web application handles web requests.
Affected packages:
- System.Security.Cryptography.Pkcs (release 9.0): 9.0.0 - 9.0.20; fixed 9.0.21
- System.Security.Cryptography.Pkcs (release 10.0): 10.0.0 - 10.0.12; fixed 10.0.13
- System.Security.Cryptography.Pkcs (release 8.0): 8.0.0
2026-10-13
Published