Inefficient algorithm in .NET allows denial of service
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-407.
Summary
Microsoft .NET Framework 3.5 and 4.6.2 through 4.8.1, Visual Studio 2022 version 17.14 and 2026 version 18.10, and the System.Security.Cryptography.Pkcs NuGet package contain inefficient algorithmic complexity (CWE-407). An unauthorized attacker can deny service over a network without user interaction or privileges.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
Description from the CNA
Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Microsoft .NET Framework 3.5 | 3.5.0 to before 2.0.50727.9188 AND 3.0.30729.9171 | 2.0.50727.9188 AND 3.0.30729.9171 | Patch available | CNA |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 | 3.0.0.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 | 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 | Patch available | CNA |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 | 4.7.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 | 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 | Patch available | CNA |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 | 4.8.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 | 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 | Patch available | CNA |
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 | 4.8.1 to before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 | 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 | Patch available | CNA |
| Microsoft | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 | 4.7.0 to before 4.7.4150.0 | 4.7.4150.0 | Patch available | CNA |
| Microsoft | Microsoft .NET Framework 4.8 | 4.8.0 to before 4.8.4811.0 | 4.8.4811.0 | Patch available | CNA |
| Microsoft | Microsoft .NET Framework 4.8.1 | 4.8.0.0 to before 4.8.9363.0 | 4.8.9363.0 | Patch available | CNA |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 to before 17.14.42 | 17.14.42 | Patch available | CNA |
| Microsoft | Microsoft Visual Studio 2026 version 18.10 | 18.10.0 to before 18.10.4 | 18.10.4 | Patch available | CNA |
| Microsoft | System.Security.Cryptography.Pkcs | 10.0.0 to before 10.0.13 | 10.0.13 | Patch available | CNA |
| — | System.Security.Cryptography.Pkcs (NuGet) | 10.0.0 to before 10.0.13 | 10.0.13 | Patch available | GHSA-846f-f764-76mx |
| — | System.Security.Cryptography.Pkcs (NuGet) | 11.0.0-preview.1 to before 11.0.0-rc.2 | 11.0.0-rc.2 | Patch available | GHSA-846f-f764-76mx |
| — | System.Security.Cryptography.Pkcs (NuGet) | 8.0.0 to before 8.0.2 | 8.0.2 | Patch available | GHSA-846f-f764-76mx |
| — | System.Security.Cryptography.Pkcs (NuGet) | 9.0.0 to before 9.0.21 | 9.0.21 | Patch available | GHSA-846f-f764-76mx |
- Microsoft .NET Framework 3.5 VendorMicrosoft Affected 3.5.0 to before 2.0.50727.9188 AND 3.0.30729.9171 Fixed in 2.0.50727.9188 AND 3.0.30729.9171 Patch available CNA
- Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 VendorMicrosoft Affected 3.0.0.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 Patch available CNA
- Microsoft .NET Framework 3.5 AND 4.7.2 VendorMicrosoft Affected 4.7.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 Patch available CNA
- Microsoft .NET Framework 3.5 AND 4.8 VendorMicrosoft Affected 4.8.0 to before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 Patch available CNA
- Microsoft .NET Framework 3.5 AND 4.8.1 VendorMicrosoft Affected 4.8.1 to before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 Patch available CNA
- Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 VendorMicrosoft Affected 4.7.0 to before 4.7.4150.0 Fixed in 4.7.4150.0 Patch available CNA
- Microsoft .NET Framework 4.8 VendorMicrosoft Affected 4.8.0 to before 4.8.4811.0 Fixed in 4.8.4811.0 Patch available CNA
- Microsoft .NET Framework 4.8.1 VendorMicrosoft Affected 4.8.0.0 to before 4.8.9363.0 Fixed in 4.8.9363.0 Patch available CNA
- Microsoft Visual Studio 2022 version 17.14 VendorMicrosoft Affected 17.14.0 to before 17.14.42 Fixed in 17.14.42 Patch available CNA
- Microsoft Visual Studio 2026 version 18.10 VendorMicrosoft Affected 18.10.0 to before 18.10.4 Fixed in 18.10.4 Patch available CNA
- System.Security.Cryptography.Pkcs VendorMicrosoft Affected 10.0.0 to before 10.0.13 Fixed in 10.0.13 Patch available CNA
- System.Security.Cryptography.Pkcs (NuGet) Vendor— Affected 10.0.0 to before 10.0.13 Fixed in 10.0.13 Patch available GHSA-846f-f764-76mx
- System.Security.Cryptography.Pkcs (NuGet) Vendor— Affected 11.0.0-preview.1 to before 11.0.0-rc.2 Fixed in 11.0.0-rc.2 Patch available GHSA-846f-f764-76mx
- System.Security.Cryptography.Pkcs (NuGet) Vendor— Affected 8.0.0 to before 8.0.2 Fixed in 8.0.2 Patch available GHSA-846f-f764-76mx
- System.Security.Cryptography.Pkcs (NuGet) Vendor— Affected 9.0.0 to before 9.0.21 Fixed in 9.0.21 Patch available GHSA-846f-f764-76mx
Remediation
Apply the fixed .NET Framework builds, including 2.0.50727.9188 and 3.0.30729.9171 for 3.5 and 4.8.9363.0 for 4.8.1, and update Visual Studio 2022 to 17.14.42 and Visual Studio 2026 to 18.10.4. Update System.Security.Cryptography.Pkcs to 8.0.2, 9.0.21, 10.0.13 or 11.0.0-rc.2 for the matching major version. Red Hat fixes this in advisories such as RHSA-2026:88424 and RHSA-2026:86195.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
- Fix · CNA Microsoft .NET Framework 3.5 (Microsoft) Fixed in 2.0.50727.9188 AND 3.0.30729.9171
- Fix · CNA Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 (Microsoft) Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
- Fix · CNA Microsoft .NET Framework 3.5 AND 4.7.2 (Microsoft) Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
- Fix · CNA Microsoft .NET Framework 3.5 AND 4.8 (Microsoft) Fixed in 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
- Fix · CNA Microsoft .NET Framework 3.5 AND 4.8.1 (Microsoft) Fixed in 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
- Fix · CNA Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 (Microsoft) Fixed in 4.7.4150.0
- Fix · CNA Microsoft .NET Framework 4.8 (Microsoft) Fixed in 4.8.4811.0
- Fix · CNA Microsoft .NET Framework 4.8.1 (Microsoft) Fixed in 4.8.9363.0
- Fix · CNA Microsoft Visual Studio 2022 version 17.14 (Microsoft) Fixed in 17.14.42
- Fix · CNA Microsoft Visual Studio 2026 version 18.10 (Microsoft) Fixed in 18.10.4
- Fix · CNA System.Security.Cryptography.Pkcs (Microsoft) Fixed in 10.0.13
- Fix · GHSA-846f-f764-76mx System.Security.Cryptography.Pkcs (NuGet) Fixed in 10.0.13 Advisory →
- Fix · GHSA-846f-f764-76mx System.Security.Cryptography.Pkcs (NuGet) Fixed in 11.0.0-rc.2 Advisory →
- Fix · GHSA-846f-f764-76mx System.Security.Cryptography.Pkcs (NuGet) Fixed in 8.0.2 Advisory →
- Fix · GHSA-846f-f764-76mx System.Security.Cryptography.Pkcs (NuGet) Fixed in 9.0.21 Advisory →
Red Hat 16 advisories
- RHSA-2026:89735 Released 2026-10-27 · Red Hat rating Critical.NET 9.0 security update
- Red Hat CodeReady Linux Builder EUS (v.9.6) dotnet-sdk-9.0-source-built-artifacts-9.0.122-1.el9_6
- Red Hat Enterprise Linux AppStream EUS (v.9.6) aspnetcore-runtime-9.0-9.0.21-1.el9_6, aspnetcore-runtime-dbg-9.0-9.0.21-1.el9_6, aspnetcore-targeting-pack-9.0-9.0.21-1.el9_6 +12
- RHSA-2026:88474 Released 2026-10-22 · Red Hat rating Critical.NET 8.0 security update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) aspnetcore-runtime-8.0-8.0.32-1.el10_0, aspnetcore-runtime-dbg-8.0-8.0.32-1.el10_0, aspnetcore-targeting-pack-8.0-8.0.32-1.el10_0 +9
- Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) dotnet-sdk-8.0-source-built-artifacts-8.0.132-1.el10_0
- RHSA-2026:88422 Released 2026-10-22 · Red Hat rating Critical.NET 8.0 security update
- Red Hat CodeReady Linux Builder EUS (v.9.6) dotnet-sdk-8.0-source-built-artifacts-8.0.132-1.el9_6
- Red Hat Enterprise Linux AppStream EUS (v.9.6) aspnetcore-runtime-8.0-8.0.32-1.el9_6, aspnetcore-runtime-dbg-8.0-8.0.32-1.el9_6, aspnetcore-targeting-pack-8.0-8.0.32-1.el9_6 +9
Show 13 more Red Hat advisories
- RHSA-2026:88425 Released 2026-10-22 · Red Hat rating Critical.NET 8.0 security update
- Red Hat Enterprise Linux AppStream E4S (v.9.4) aspnetcore-runtime-8.0-8.0.32-1.el9_4, aspnetcore-runtime-dbg-8.0-8.0.32-1.el9_4, aspnetcore-targeting-pack-8.0-8.0.32-1.el9_4 +11
- RHSA-2026:88424 Released 2026-10-22 · Red Hat rating Critical.NET 9.0 security update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) aspnetcore-runtime-9.0-9.0.21-1.el10_0, aspnetcore-runtime-dbg-9.0-9.0.21-1.el10_0, aspnetcore-targeting-pack-9.0-9.0.21-1.el10_0 +12
- Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) dotnet-sdk-9.0-source-built-artifacts-9.0.122-1.el10_0
- RHSA-2026:86594 Released 2026-10-21 · Red Hat rating Critical.NET 8.0 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 8) aspnetcore-runtime-8.0-8.0.32-2.el8_10, aspnetcore-runtime-dbg-8.0-8.0.32-2.el8_10, aspnetcore-targeting-pack-8.0-8.0.32-2.el8_10 +9
- Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts-8.0.132-2.el8_10
- RHSA-2026:86193 Released 2026-10-20 · Red Hat rating Critical.NET 10.0 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 9) aspnetcore-runtime-10.0-10.0.13-1.el9_8, aspnetcore-runtime-dbg-10.0-10.0.13-1.el9_8, aspnetcore-targeting-pack-10.0-10.0.13-1.el9_8 +11
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-10.0-source-built-artifacts-10.0.113-1.el9_8
- RHSA-2026:86171 Released 2026-10-20 · Red Hat rating Critical.NET 9.0 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 9) aspnetcore-runtime-9.0-9.0.21-1.el9_8, aspnetcore-runtime-dbg-9.0-9.0.21-1.el9_8, aspnetcore-targeting-pack-9.0-9.0.21-1.el9_8 +11
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-9.0-source-built-artifacts-9.0.122-1.el9_8
- RHSA-2026:86169 Released 2026-10-20 · Red Hat rating Critical.NET 8.0 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 9) aspnetcore-runtime-8.0-8.0.32-1.el9_8, aspnetcore-runtime-dbg-8.0-8.0.32-1.el9_8, aspnetcore-targeting-pack-8.0-8.0.32-1.el9_8 +9
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts-8.0.132-1.el9_8
- RHSA-2026:86192 Released 2026-10-20 · Red Hat rating Critical.NET 10.0 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 8) aspnetcore-runtime-10.0-10.0.13-1.el8_10, aspnetcore-runtime-dbg-10.0-10.0.13-1.el8_10, aspnetcore-targeting-pack-10.0-10.0.13-1.el8_10 +11
- Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-10.0-source-built-artifacts-10.0.113-1.el8_10
- RHSA-2026:86170 Released 2026-10-20 · Red Hat rating Critical.NET 9.0 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 8) aspnetcore-runtime-9.0-9.0.21-1.el8_10, aspnetcore-runtime-dbg-9.0-9.0.21-1.el8_10, aspnetcore-targeting-pack-9.0-9.0.21-1.el8_10 +11
- Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-9.0-source-built-artifacts-9.0.122-1.el8_10
- RHSA-2026:86172 Released 2026-10-20 · Red Hat rating Critical.NET 9.0 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 10) aspnetcore-runtime-9.0-9.0.21-1.el10_2, aspnetcore-runtime-dbg-9.0-9.0.21-1.el10_2, aspnetcore-targeting-pack-9.0-9.0.21-1.el10_2 +11
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-9.0-source-built-artifacts-9.0.122-1.el10_2
- RHSA-2026:86195 Released 2026-10-20 · Red Hat rating Critical.NET 10.0 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 10) aspnetcore-runtime-10.0-10.0.13-1.el10_2, aspnetcore-runtime-dbg-10.0-10.0.13-1.el10_2, aspnetcore-targeting-pack-10.0-10.0.13-1.el10_2 +11
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-10.0-source-built-artifacts-10.0.113-1.el10_2
- RHSA-2026:86168 Released 2026-10-20 · Red Hat rating Critical.NET 8.0 security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 10) aspnetcore-runtime-8.0-8.0.32-1.el10_2, aspnetcore-runtime-dbg-8.0-8.0.32-1.el10_2, aspnetcore-targeting-pack-8.0-8.0.32-1.el10_2 +9
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts-8.0.132-1.el10_2
- RHSA-2026:84693 Released 2026-10-19 · Red Hat rating ImportantRed Hat Hardened Images RPMs Security Update
- Red Hat Hardened Images aspnetcore-runtime-8.0-8.0.32-0.1.hum1@aarch64, aspnetcore-runtime-8.0-8.0.32-0.1.hum1@x86_64, aspnetcore-runtime-dbg-8.0-8.0.32-0.1.hum1@aarch64 +22
- RHSA-2026:84491 Released 2026-10-18 · Red Hat rating ImportantRed Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images dotnet-sdk-10.0-10.0.113-1.hum1@aarch64, dotnet-sdk-10.0-10.0.113-1.hum1@s390x, dotnet-sdk-10.0-10.0.113-1.hum1@x86_64 +12
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat CodeReady Linux Builder EUS (v.9.6) | Fixed | RHSA-2026:88422, RHSA-2026:89735 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:86168, RHSA-2026:86172, RHSA-2026:86195 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2026:86170, RHSA-2026:86192, RHSA-2026:86594 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:86169, RHSA-2026:86171, RHSA-2026:86193 |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:88425 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:88424, RHSA-2026:88474 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:88422, RHSA-2026:89735 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2026:86170, RHSA-2026:86192, RHSA-2026:86594 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:86168, RHSA-2026:86172, RHSA-2026:86195 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2026:86169, RHSA-2026:86171, RHSA-2026:86193 |
| Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | Fixed | RHSA-2026:88424, RHSA-2026:88474 |
| Red Hat Hardened Images | Fixed | RHSA-2026:84491, RHSA-2026:84693 |
Not affected: 1 product
- Red Hat Hardened Images
Timeline
- 2026-10-13 Threatist record created from CVE-2026-84008
- 2026-10-13 Alias added: GHSA-846f-f764-76mx
- 2026-10-13 Fix available: NuGet/[email protected], NuGet/[email protected], NuGet/[email protected] +1 · GHSA-846f-f764-76mx
- 2026-10-13 CVSS score added · GHSA-846f-f764-76mx
- 2026-10-13 Weakness changed · GHSA-846f-f764-76mx
- 2026-10-13 4 new references · GHSA-846f-f764-76mx
- 2026-10-14 CISA SSVC decision points changed
- 2026-10-14 Priority changed: MEDIUM → LOW
- 2026-10-14 Priority changed: LOW → MEDIUM
- 2026-10-20 2 new references · GHSA-846f-f764-76mx
- 2026-10-23 Affected versions changed · Red Hat
- 2026-10-24 Fix available: RHSA-2026:84693 · Red Hat
- 2026-10-24 Fix available: Red Hat Hardened Images · Red Hat
- 2026-10-24 CVSS score added · Red Hat
- 2026-10-29 Fix available: RHSA-2026:84491 · Red Hat
- 2026-10-29 Affected versions changed · Red Hat
- 2026-10-30 Fix available: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 8) +8 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:86168 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:86170 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:86169 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:86171 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:86594 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:86172 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:88424 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:88425 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:88474 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:89735 · Red Hat
- 2026-11-03 Fix available: RHSA-2026:88422 · Red Hat
- 2026-11-03 Affected versions changed · Red Hat
- 2026-11-05 Affected versions changed · Red Hat
- 2026-11-05 Fix available: RHSA-2026:86192 · Red Hat
- 2026-11-05 Fix available: RHSA-2026:86195 · Red Hat
- 2026-11-05 Fix available: RHSA-2026:86193 · Red Hat
References
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Sources
- CVE-2026-84008 · CVE Program
- CVE-2026-84008 · NVD
- FIRST EPSS
- GHSA-846f-f764-76mx · GitHub Advisory Database · CC BY 4.0
- CVE-2026-84008 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences