Description
Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | .NET 10.0 runtime | 10.0.0 – < 10.0.11 | 10.0.11 |
| Microsoft | .NET 8.0 runtime | 8.0.0 – < 8.0.30 | 8.0.30 |
| Microsoft | .NET 9.0 runtime | 9.0.0 – < 9.0.19 | 9.0.19 |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 – < 17.14.38 | 17.14.38 |
| Microsoft | Microsoft Visual Studio 2026 version 18.8 | 18.0 – < 18.8.3 | 18.8.3 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | dotnet10 | 10.0.111-10.0.11-0ubuntu1~26.04.1 | USN-8641-1 |
| Ubuntu 24.04 LTS | dotnet10 | 10.0.111-10.0.11-0ubuntu1~24.04.1 | USN-8641-1 |
| Ubuntu 24.04 LTS | dotnet8 | 8.0.130-8.0.30-0ubuntu1~24.04.1 | USN-8641-1 |
| Ubuntu 22.04 LTS | dotnet6 +1 | No fix yet | — |
| Ubuntu 22.04 LTS | dotnet8 | 8.0.130-8.0.30-0ubuntu1~22.04.1 | USN-8641-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | dotnet-host +8 | 10.0.11-1.el10_2 | RHSA-2026:55858 |
| RHEL 10 | dotnet-hostfxr-8.0 +7 | 8.0.30-1.el10_2 | RHSA-2026:54541 |
| RHEL 10 | dotnet-hostfxr-9.0 +7 | 9.0.19-1.el10_2 | RHSA-2026:54590 |
| RHEL 10 | dotnet10.0 +5 | 10.0.111-1.el10_2 | RHSA-2026:55858 |
| RHEL 10 | dotnet8.0 +4 | 8.0.130-1.el10_2 | RHSA-2026:54541 |
| RHEL 10 | dotnet9.0 +6 | 9.0.120-1.el10_2 | RHSA-2026:54590 |
| RHEL 9 | dotnet-host +8 | 10.0.11-1.el9_8 | RHSA-2026:55857 |
| RHEL 9 | dotnet-hostfxr-8.0 +7 | 8.0.30-1.el9_8 | RHSA-2026:54574 |
| RHEL 9 | dotnet-hostfxr-9.0 +7 | 9.0.19-1.el9_8 | RHSA-2026:55856 |
| RHEL 9 | dotnet10.0 +5 | 10.0.111-1.el9_8 | RHSA-2026:55857 |
| RHEL 9 | dotnet8.0 +4 | 8.0.130-1.el9_8 | RHSA-2026:54574 |
| RHEL 9 | dotnet9.0 +6 | 9.0.120-1.el9_8 | RHSA-2026:55856 |
| RHEL 8 | dotnet +6 | 10.0.111-1.el8_10 | RHSA-2026:54542 |
| RHEL 8 | dotnet-host +8 | 10.0.11-1.el8_10 | RHSA-2026:54542 |
| RHEL 8 | dotnet-hostfxr-8.0 +7 | 8.0.30-1.el8_10 | RHSA-2026:54538 |
| RHEL 8 | dotnet-hostfxr-9.0 +7 | 9.0.19-1.el8_10 | RHSA-2026:54550 |
| RHEL 8 | dotnet8.0 +4 | 8.0.130-1.el8_10 | RHSA-2026:54538 |
| RHEL 8 | dotnet9.0 +6 | 9.0.120-1.el8_10 | RHSA-2026:54550 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | dotnet-host +8 | 9.0.19-1.el10_0 | RHSA-2026:58567 |
| RHEL 10.0 EUS | dotnet-hostfxr-8.0 +7 | 8.0.30-1.el10_0 | RHSA-2026:58566 |
| RHEL 10.0 EUS | dotnet8.0 +4 | 8.0.130-1.el10_0 | RHSA-2026:58566 |
| RHEL 10.0 EUS | dotnet9.0 +6 | 9.0.120-1.el10_0 | RHSA-2026:58567 |
| RHEL 9.6 EUS | dotnet-host +8 | 9.0.19-1.el9_6 | RHSA-2026:58570 |
| RHEL 9.6 EUS | dotnet-hostfxr-8.0 +7 | 8.0.30-1.el9_6 | RHSA-2026:58569 |
| RHEL 9.6 EUS | dotnet8.0 +4 | 8.0.130-1.el9_6 | RHSA-2026:58569 |
| RHEL 9.6 EUS | dotnet9.0 +6 | 9.0.120-1.el9_6 | RHSA-2026:58570 |
| RHEL 9.4 E4S | dotnet-host +8 | 8.0.30-1.el9_4 | RHSA-2026:58568 |
| RHEL 9.4 E4S | dotnet8.0 +4 | 8.0.130-1.el9_4 | RHSA-2026:58568 |
| Red Hat Hardened Images 1 | dotnet-hostfxr-8.0 +7 | 8.0.30-0.1.hum1 | RHSA-2026:55405 |
| Red Hat Hardened Images 1 | dotnet10.0 +5 | 10.0.111-1.hum1 | RHSA-2026:55142 |
| Red Hat Hardened Images 1 | dotnet8.0 +4 | 8.0.130-0.1.hum1 | RHSA-2026:55405 |
| Red Hat Hardened Images 1 | dotnet9.0 +6 | 9.0.119-2.hum1 | RHSA-2026:44914 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | dotnet-host +8 | 10.0.11-1.el10_2 | ALSA-2026:55858 |
| AlmaLinux 10 | dotnet-hostfxr-8.0 +7 | 8.0.30-1.el10_2 | ALSA-2026:54541 |
| AlmaLinux 10 | dotnet-hostfxr-9.0 +7 | 9.0.19-1.el10_2 | ALSA-2026:54590 |
| AlmaLinux 10 | dotnet-sdk-10.0 +4 | 10.0.111-1.el10_2 | ALSA-2026:55858 |
| AlmaLinux 10 | dotnet-sdk-8.0 +3 | 8.0.130-1.el10_2 | ALSA-2026:54541 |
| AlmaLinux 10 | dotnet-sdk-9.0 +5 | 9.0.120-1.el10_2 | ALSA-2026:54590 |
| AlmaLinux 9 | dotnet-host +8 | 10.0.11-1.el9_8 | ALSA-2026:55857 |
| AlmaLinux 9 | dotnet-hostfxr-8.0 +7 | 8.0.30-1.el9_8 | ALSA-2026:54574 |
| AlmaLinux 9 | dotnet-hostfxr-9.0 +7 | 9.0.19-1.el9_8 | ALSA-2026:55856 |
| AlmaLinux 9 | dotnet-sdk-10.0 +4 | 10.0.111-1.el9_8 | ALSA-2026:55857 |
| AlmaLinux 9 | dotnet-sdk-8.0 +3 | 8.0.130-1.el9_8 | ALSA-2026:54574 |
| AlmaLinux 9 | dotnet-sdk-9.0 +5 | 9.0.120-1.el9_8 | ALSA-2026:55856 |
| AlmaLinux 8 | dotnet +5 | 10.0.111-1.el8_10 | ALSA-2026:54542 |
| AlmaLinux 8 | dotnet-host +8 | 10.0.11-1.el8_10 | ALSA-2026:54542 |
| AlmaLinux 8 | dotnet-hostfxr-8.0 +7 | 8.0.30-1.el8_10 | ALSA-2026:54538 |
| AlmaLinux 8 | dotnet-hostfxr-9.0 +7 | 9.0.19-1.el8_10 | ALSA-2026:54550 |
| AlmaLinux 8 | dotnet-sdk-8.0 +3 | 8.0.130-1.el8_10 | ALSA-2026:54538 |
| AlmaLinux 8 | dotnet-sdk-9.0 +5 | 9.0.120-1.el8_10 | ALSA-2026:54550 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | dotnet10.0 | 10.0.111-1.el10_2 | RLSA-2026:55858 |
| Rocky Linux 10 | dotnet8.0 | 8.0.130-1.el10_2 | RLSA-2026:54541 |
| Rocky Linux 10 | dotnet9.0 | 9.0.120-1.el10_2 | RLSA-2026:54590 |
| Rocky Linux 9 | dotnet10.0 | 10.0.111-1.el9_8 | RLSA-2026:55857 |
| Rocky Linux 9 | dotnet8.0 | 8.0.130-1.el9_8 | RLSA-2026:54574 |
| Rocky Linux 9 | dotnet9.0 | 9.0.120-1.el9_8 | RLSA-2026:55856 |
| Rocky Linux 8 | dotnet10.0 | 10.0.111-1.el8_10 | RLSA-2026:54542 |
| Rocky Linux 8 | dotnet8.0 | 8.0.130-1.el8_10 | RLSA-2026:54538 |
| Rocky Linux 8 | dotnet9.0 | 9.0.120-1.el8_10 | RLSA-2026:54550 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dotnet10-runtime | 10.0.12-r0 | — |
| Alpine v3.24 | dotnet8-runtime | 8.0.31-r0 | — |
| Alpine v3.24 | dotnet9-runtime | 9.0.20-r0 | — |
| Alpine v3.23 | dotnet10-runtime | 10.0.13-r0 | — |
| Alpine v3.23 | dotnet8-runtime | 8.0.31-r0 | — |
| Alpine v3.23 | dotnet9-runtime | 9.0.20-r0 | — |
| Alpine v3.22 | dotnet8-runtime | 8.0.31-r0 | — |
| Alpine v3.22 | dotnet9-runtime | 9.0.20-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | dotnet +5 | 8.0.130-1.amzn2023.0.1 | ALAS2023-2026-2096, ALAS2023-2026-2095, ALAS2023-2026-2094 |
| Amazon Linux 2023 | dotnet-host +8 | 8.0.30-1.amzn2023.0.1 | ALAS2023-2026-2096, ALAS2023-2026-2095, ALAS2023-2026-2094 |
| Amazon Linux 2023 | dotnet-hostfxr-10.0 +7 | 10.0.11-1.amzn2023.0.1 | ALAS2023-2026-2094 |
| Amazon Linux 2023 | dotnet-hostfxr-9.0 +7 | 9.0.19-1.amzn2023.0.1 | ALAS2023-2026-2096 |
| Amazon Linux 2023 | dotnet-sdk-10.0 +4 | 10.0.111-1.amzn2023.0.1 | ALAS2023-2026-2094 |
| Amazon Linux 2023 | dotnet-sdk-9.0 +4 | 9.0.120-1.amzn2023.0.1 | ALAS2023-2026-2096 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | dotnet-host +8 | 10.0.11-1.0.1.el10_2 | ELSA-2026-55858 |
| Oracle Linux 10 | dotnet-hostfxr-8.0 +7 | 8.0.30-1.0.1.el10_2 | ELSA-2026-54541 |
| Oracle Linux 10 | dotnet-hostfxr-9.0 +7 | 9.0.19-1.0.1.el10_2 | ELSA-2026-54590 |
| Oracle Linux 10 | dotnet-sdk-10.0 +4 | 10.0.111-1.0.1.el10_2 | ELSA-2026-55858 |
| Oracle Linux 10 | dotnet-sdk-8.0 +3 | 8.0.130-1.0.1.el10_2 | ELSA-2026-54541 |
| Oracle Linux 10 | dotnet-sdk-9.0 +5 | 9.0.120-1.0.1.el10_2 | ELSA-2026-54590 |
| Oracle Linux 9 | dotnet-host +8 | 10.0.11-1.0.1.el9_8 | ELSA-2026-55857 |
| Oracle Linux 9 | dotnet-hostfxr-8.0 +7 | 8.0.30-1.0.1.el9_8 | ELSA-2026-54574 |
| Oracle Linux 9 | dotnet-hostfxr-9.0 +7 | 9.0.19-1.0.1.el9_8 | ELSA-2026-55856 |
| Oracle Linux 9 | dotnet-sdk-10.0 +4 | 10.0.111-1.0.1.el9_8 | ELSA-2026-55857 |
| Oracle Linux 9 | dotnet-sdk-8.0 +3 | 8.0.130-1.0.1.el9_8 | ELSA-2026-54574 |
| Oracle Linux 9 | dotnet-sdk-9.0 +5 | 9.0.120-1.0.1.el9_8 | ELSA-2026-55856 |
| Oracle Linux 8 | dotnet +5 | 10.0.111-1.0.1.el8_10 | ELSA-2026-54542 |
| Oracle Linux 8 | dotnet-host +8 | 10.0.11-1.0.1.el8_10 | ELSA-2026-54542 |
| Oracle Linux 8 | dotnet-hostfxr-8.0 +7 | 8.0.30-1.0.1.el8_10 | ELSA-2026-54538 |
| Oracle Linux 8 | dotnet-hostfxr-9.0 +7 | 9.0.19-1.0.1.el8_10 | ELSA-2026-54550 |
| Oracle Linux 8 | dotnet-sdk-8.0 +3 | 8.0.130-1.0.1.el8_10 | ELSA-2026-54538 |
| Oracle Linux 8 | dotnet-sdk-9.0 +5 | 9.0.120-1.0.1.el8_10 | ELSA-2026-54550 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | dotnet-bootstrap-8 | 8.0.131-r0 | — |
| Wolfi rolling | dotnet-bootstrap-9 | 9.0.121-r0 | — |
Affected packages
Advisories 50
- WID-SEC-2026-2761 Microsoft Developer Tools: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- ALSA-2026:55856 Important: .NET 9.0 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:55857 Important: .NET 10.0 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:54574 Important: .NET 8.0 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:54541 Important: .NET 8.0 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:54590 Important: .NET 9.0 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:55858 Important: .NET 10.0 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:54550 Important: .NET 9.0 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:54542 Important: .NET 10.0 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:54538 Important: .NET 8.0 security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:58569 Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:58570 Red Hat Security Advisory: .NET 9.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:58567 Red Hat Security Advisory: .NET 9.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:58568 Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:58566 Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:55857 Red Hat Security Advisory: .NET 10.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:55858 Red Hat Security Advisory: .NET 10.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:55856 Red Hat Security Advisory: .NET 9.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:55405 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:55142 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:54590 Red Hat Security Advisory: .NET 9.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:54574 Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:54550 Red Hat Security Advisory: .NET 9.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:54541 Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:54542 Red Hat Security Advisory: .NET 10.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:54538 Red Hat Security Advisory: .NET 8.0 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:44914 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- ALAS2023-2026-2094 Important: dotnet10.0 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- ALAS2023-2026-2095 Important: dotnet8.0 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- ALAS2023-2026-2096 Important: dotnet9.0 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- USN-8641-1 dotnet8, dotnet10 vulnerabilities Ubuntu Security Notices (USN) · Aug 19, 2026
- RLSA-2026:55856 Important: .NET 9.0 security, bug fix, and enhancement update Rocky Linux Security Advisories · Aug 19, 2026
- RLSA-2026:55857 Important: .NET 10.0 security, bug fix, and enhancement update Rocky Linux Security Advisories · Aug 19, 2026
- RLSA-2026:55858 Important: .NET 10.0 security, bug fix, and enhancement update Rocky Linux Security Advisories · Aug 18, 2026
- ELSA-2026-55858 Important: .NET 10.0 security, bug fix, and enhancement update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Aug 18, 2026
- ELSA-2026-55857 Important: .NET 10.0 security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 18, 2026
- ELSA-2026-55856 Important: .NET 9.0 security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 18, 2026
- RLSA-2026:54550 Important: .NET 9.0 security, bug fix, and enhancement update Rocky Linux Security Advisories · Aug 15, 2026
- RLSA-2026:54542 Important: .NET 10.0 security, bug fix, and enhancement update Rocky Linux Security Advisories · Aug 15, 2026
- RLSA-2026:54574 Important: .NET 8.0 security, bug fix, and enhancement update Rocky Linux Security Advisories · Aug 15, 2026
- RLSA-2026:54541 Important: .NET 8.0 security, bug fix, and enhancement update Rocky Linux Security Advisories · Aug 14, 2026
- RLSA-2026:54590 Important: .NET 9.0 security, bug fix, and enhancement update Rocky Linux Security Advisories · Aug 14, 2026
- RLSA-2026:54538 Important: .NET 8.0 security, bug fix, and enhancement update Rocky Linux Security Advisories · Aug 14, 2026
- ELSA-2026-54550 Important: .NET 9.0 security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 14, 2026
- ELSA-2026-54574 Important: .NET 8.0 security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 13, 2026
- ELSA-2026-54542 Important: .NET 10.0 security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 13, 2026
- ELSA-2026-54538 Important: .NET 8.0 security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 13, 2026
- ELSA-2026-54590 Important: .NET 9.0 security, bug fix, and enhancement update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Aug 13, 2026
- ELSA-2026-54541 Important: .NET 8.0 security, bug fix, and enhancement update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Aug 13, 2026
- NCSC-2026-0285 Kwetsbaarheden verholpen in Microsoft Developer Tools NCSC-NL (Netherlands) · Aug 11, 2026
References
- .NET Security Feature Bypass Vulnerability vendor-advisory patch