vulnerability / NVI-00016397 / Revision 1
Microsoft Security Advisory CVE-2026-50527 – .NET Denial of Service Vulnerability
GitHub lists this reviewed advisory for System.Security.Cryptography.Xml, System.Security.Cryptography.Xml, System.Security.Cryptography.Xml. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
7.5 high
GitHub source severity; exploitability and local consequence require separate evidence.
As of · GitHub Advisory Database
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
System.Security.Cryptography.Xml
source listed>= 10.0.0, <= 10.0.9
## Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET XML Encryption (System.Security.Cryptography.Xml). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A denial of service vulnerability exists in the XML encryption implementation (EncryptedXml) in .NET 8, .NET 9, and .NET 10. An attacker could exploit this vulnerability by supplying crafted encrypted XML that is improperly validated, resulting in denial of service. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/416 ## CVSS Details - **Version:** 3.1 - **Severity:** High - **Score:** 7.5 - **Vector:** `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` - **Weakness:** CWE-121 (Stack-based Buffer Overflow) ## Affected Platforms - **Platforms:** All - **Architectures:** All ## Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below ### .NET 10.0 Package name | Affected version | Patched version ------------
System.Security.Cryptography.Xml
source listed>= 9.0.0, <= 9.0.17
## Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET XML Encryption (System.Security.Cryptography.Xml). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A denial of service vulnerability exists in the XML encryption implementation (EncryptedXml) in .NET 8, .NET 9, and .NET 10. An attacker could exploit this vulnerability by supplying crafted encrypted XML that is improperly validated, resulting in denial of service. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/416 ## CVSS Details - **Version:** 3.1 - **Severity:** High - **Score:** 7.5 - **Vector:** `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` - **Weakness:** CWE-121 (Stack-based Buffer Overflow) ## Affected Platforms - **Platforms:** All - **Architectures:** All ## Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below ### .NET 10.0 Package name | Affected version | Patched version ------------
System.Security.Cryptography.Xml
source listed>= 8.0.0, <= 8.0.3
## Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET XML Encryption (System.Security.Cryptography.Xml). This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A denial of service vulnerability exists in the XML encryption implementation (EncryptedXml) in .NET 8, .NET 9, and .NET 10. An attacker could exploit this vulnerability by supplying crafted encrypted XML that is improperly validated, resulting in denial of service. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/416 ## CVSS Details - **Version:** 3.1 - **Severity:** High - **Score:** 7.5 - **Vector:** `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` - **Weakness:** CWE-121 (Stack-based Buffer Overflow) ## Affected Platforms - **Platforms:** All - **Architectures:** All ## Affected Packages The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below ### .NET 10.0 Package name | Affected version | Patched version ------------
03 / Response
What to do next
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-mmjf-rqrv-855v ↗
GitHub Advisory Database · vendor advisory
Observed . GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.