CVE-2026-32203 json
.NET and Visual Studio Denial of Service Vulnerability
published 2026-04-14 6 mo ago modified 2026-10-26 13 d ago also BIT-dotnet-2026-32203 , BIT-dotnet-sdk-2026-32203 , EUVD-2026-22591 , GHSA-6588-8gv4-xfgh
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.9%
- EPSS 1.9% chance of exploitation in 30 days, percentile 79%
- public exploits
- 0
- none known
Summary
Stack-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to deny service over a network.
Patch / fix
- nuget System.Security.Cryptography.Xml 8.0.3, 9.0.15, 10.0.6
- bitnami dotnet 8.0.26, 9.0.15, 10.0.6
- bitnami dotnet-sdk 8.0.26, 9.0.15, 10.0.6
- Microsoft .NET 10.0 10.0.6
- Microsoft .NET 8.0 8.0.26
- Microsoft .NET 9.0 9.0.15
- Microsoft Microsoft Visual Studio 2022 version 17.12 17.12.19
- Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.30
- Microsoft Microsoft Visual Studio 2026 version 18.4 18.4.4
- Red Hat Red Hat Enterprise Linux 10 0:8.0.126-1.el10_1, 0:9.0.116-1.el10_1, 0:10.0.106-1.el10_1
- Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:8.0.126-1.el10_0, 0:9.0.116-1.el10_0
- Red Hat Red Hat Enterprise Linux 8 0:8.0.126-1.el8_10, 0:9.0.116-1.el8_10, 0:10.0.106-1.el8_10
- Red Hat Red Hat Enterprise Linux 9 0:8.0.126-1.el9_7, 0:9.0.116-1.el9_7, 0:10.0.106-1.el9_7
- Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:8.0.126-1.el9_4
- Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:8.0.126-1.el9_6, 0:9.0.116-1.el9_6
- Red Hat Red Hat Hardened Images 8.0.126-1.hum1, 9.0.116-1.hum1, 10.0.106-1.hum1
- dotnet8 Ubuntu 22.04 LTS 8.0.126-8.0.26-0ubuntu1~22.04.1
- dotnet8 Ubuntu 24.04 LTS 8.0.126-8.0.26-0ubuntu1~24.04.1
- dotnet8 Ubuntu 25.10 8.0.126-8.0.26-0ubuntu1~25.10.1
- dotnet9 Ubuntu 25.10 9.0.116-9.0.15-0ubuntu1~25.10.1
- dotnet10 Ubuntu 24.04 LTS 10.0.106-10.0.6-0ubuntu1~24.04.1
- dotnet10 Ubuntu 25.10 10.0.106-10.0.6-0ubuntu1~25.10.1
- dotnet10 Ubuntu 26.10, Ubuntu 26.04 LTS 10.0.107-10.0.7-0ubuntu1~26.04.1
ubuntu advisories UBUNTU-CVE-2026-32203
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- dotnet10.0 hummingbird 1 10.0.106-1.hum1
- dotnet9.0 hummingbird 1 9.0.116-1.hum1
- dotnet8.0 hummingbird 1 8.0.126-1.hum1
- dotnet9.0 RHEL 8 9.0.116-1.el8_10
- dotnet-sdk-9.0 RHEL 8 9.0.116-1.el8_10
- dotnet-hostfxr-9.0 RHEL 8 9.0.15-1.el8_10
- dotnet-runtime-9.0 RHEL 8 9.0.15-1.el8_10
- dotnet-sdk-aot-9.0 RHEL 8 9.0.116-1.el8_10
red hat advisories RHSA-2026:13693RHSA-2026:13282RHSA-2026:13283RHSA-2026:13281RHSA-2026:13280RHSA-2026:9077
- dotnet-sdk-8.0 AlmaLinux 8 8.0.126-1.el8_10
- dotnet-hostfxr-8.0 AlmaLinux 8 8.0.26-1.el8_10
- dotnet-runtime-8.0 AlmaLinux 8 8.0.26-1.el8_10
- dotnet-sdk-dbg-8.0 AlmaLinux 8 8.0.126-1.el8_10
- dotnet-templates-8.0 AlmaLinux 8 8.0.126-1.el8_10
- aspnetcore-runtime-8.0 AlmaLinux 8 8.0.26-1.el8_10
- dotnet-runtime-dbg-8.0 AlmaLinux 8 8.0.26-1.el8_10
- dotnet-apphost-pack-8.0 AlmaLinux 8 8.0.26-1.el8_10
almalinux advisories ALSA-2026:8468ALSA-2026:8469ALSA-2026:8470ALSA-2026:8472ALSA-2026:8473ALSA-2026:8475
- dotnet8.0 Rocky Linux 9 8.0.126-1.el9_7
- dotnet10.0 Rocky Linux 9 10.0.106-1.el9_7
- dotnet9.0 Rocky Linux 9 9.0.116-1.el9_7
- dotnet10.0 Rocky Linux 10 10.0.106-1.el10_1
- dotnet8.0 Rocky Linux 10 8.0.126-1.el10_1
- dotnet9.0 Rocky Linux 10 9.0.116-1.el10_1
- dotnet8.0 Rocky Linux 8 8.0.126-1.el8_10
- dotnet10.0 Rocky Linux 8 10.0.106-1.el8_10
rocky linux advisories RLSA-2026:8469RLSA-2026:8471RLSA-2026:8474RLSA-2026:8467RLSA-2026:8470RLSA-2026:8472
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-32203 updated cvss 7.5
dotnet: .NET: Denial of Service via stack overflow
-
Red Hat CodeReady Linux Builder EUS (v.9.4) dotnet-sdk-8.0-source-built-artifacts 8.0.126-1.el9_4fixed: vendor fix RHSA-2026:13693
-
Red Hat CodeReady Linux Builder EUS (v.9.6) dotnet-sdk-8.0-source-built-artifacts 8.0.126-1.el9_6, dotnet-sdk-9.0-source-built-artifacts 9.0.116-1.el9_6fixed: vendor fix RHSA-2026:13283
-
Red Hat Enterprise Linux AppStream (v. 8) dotnet 10.0.106-1.el8_10, dotnet8.0 8.0.126-1.el8_10, dotnet9.0 9.0.116-1.el8_10, dotnet-host 10.0.6-1.el8_10, dotnet10.0 10.0.106-1.el8_10, dotnet-sdk-8.0 8.0.126-1.el8_10, +35 morefixed: vendor fix RHSA-2026:8473
-
Red Hat Enterprise Linux AppStream (v. 9) dotnet8.0 8.0.126-1.el9_7, dotnet9.0 9.0.116-1.el9_7, dotnet-host 10.0.6-1.el9_7, dotnet10.0 10.0.106-1.el9_7, dotnet-sdk-8.0 8.0.126-1.el9_7, dotnet-sdk-9.0 9.0.116-1.el9_7, +34 morefixed: vendor fix RHSA-2026:8471
-
Red Hat Enterprise Linux AppStream (v. 10) dotnet8.0 8.0.126-1.el10_1, dotnet9.0 9.0.116-1.el10_1, dotnet-host 10.0.6-1.el10_1, dotnet10.0 10.0.106-1.el10_1, dotnet-sdk-8.0 8.0.126-1.el10_1, dotnet-sdk-9.0 9.0.116-1.el10_1, +34 morefixed: vendor fix RHSA-2026:8467
-
Red Hat Enterprise Linux AppStream EUS (v. 10.0) dotnet8.0 8.0.126-1.el10_0, dotnet9.0 9.0.116-1.el10_0, dotnet-host 9.0.15-1.el10_0, dotnet-sdk-8.0 8.0.126-1.el10_0, dotnet-sdk-9.0 9.0.116-1.el10_0, dotnet-hostfxr-8.0 8.0.26-1.el10_0, +21 morefixed: vendor fix RHSA-2026:13281
-
Red Hat Enterprise Linux AppStream EUS (v.9.4) dotnet8.0 8.0.126-1.el9_4, dotnet-host 8.0.26-1.el9_4, dotnet-sdk-8.0 8.0.126-1.el9_4, dotnet-hostfxr-8.0 8.0.26-1.el9_4, dotnet-runtime-8.0 8.0.26-1.el9_4, dotnet-sdk-dbg-8.0 8.0.126-1.el9_4, +8 morefixed: vendor fix RHSA-2026:13693
-
Red Hat Enterprise Linux AppStream EUS (v.9.6) dotnet8.0 8.0.126-1.el9_6, dotnet9.0 9.0.116-1.el9_6, dotnet-host 9.0.15-1.el9_6, dotnet-sdk-8.0 8.0.126-1.el9_6, dotnet-sdk-9.0 9.0.116-1.el9_6, dotnet-hostfxr-8.0 8.0.26-1.el9_6, +21 morefixed: vendor fix RHSA-2026:13283
show 6 moreshow fewer
-
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts 8.0.126-1.el9_7, dotnet-sdk-9.0-source-built-artifacts 9.0.116-1.el9_7, dotnet-sdk-10.0-source-built-artifacts 10.0.106-1.el9_7fixed: vendor fix RHSA-2026:8471
-
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts 8.0.126-1.el10_1, dotnet-sdk-9.0-source-built-artifacts 9.0.116-1.el10_1, dotnet-sdk-10.0-source-built-artifacts 10.0.106-1.el10_1fixed: vendor fix RHSA-2026:8467
-
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) dotnet-sdk-8.0-source-built-artifacts 8.0.126-1.el10_0, dotnet-sdk-9.0-source-built-artifacts 9.0.116-1.el10_0fixed: vendor fix RHSA-2026:13281
-
Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts 8.0.126-1.el8_10, dotnet-sdk-9.0-source-built-artifacts 9.0.116-1.el8_10, dotnet-sdk-10.0-source-built-artifacts 10.0.106-1.el8_10fixed: vendor fix RHSA-2026:8473
-
Red Hat Hardened Images dotnet8.0 8.0.126-1.hum1, dotnet9.0 9.0.116-1.hum1, dotnet10.0 10.0.106-1.hum1fixed: vendor fix RHSA-2026:9077
-
Red Hat Hardened Images aspnetcore-runtime-8.0 8.0.26-1.hum1, aspnetcore-runtime-9.0 9.0.15-1.hum1, aspnetcore-runtime-10.0 10.0.6-1.hum1not affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
1.90% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | 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 |
| CISA ADP | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| nuget | System.Security.Cryptography.Xml | >=10.0.0, <10.0.6 >=9.0.0, <9.0.15 >=8.0.0, <8.0.3 |
10.0.6 9.0.15 8.0.3 |
| bitnami | dotnet | >=8.0.0, <8.0.26 >=9.0.0, <9.0.15 >=10.0.0, <10.0.6 |
8.0.26 9.0.15 10.0.6 |
| bitnami | dotnet-sdk | >=8.0.0, <8.0.26 >=9.0.0, <9.0.15 >=10.0.0, <10.0.6 |
8.0.26 9.0.15 10.0.6 |
Affected products
- Microsoft .NET 10.0
- Microsoft .NET 8.0
- Microsoft .NET 9.0
- Microsoft Microsoft Visual Studio 2022 version 17.12
- Microsoft Microsoft Visual Studio 2022 version 17.14
- Microsoft Microsoft Visual Studio 2026 version 18.4
- Red Hat Red Hat Enterprise Linux 10
- Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 9
- Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
- Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
- Red Hat Red Hat Hardened Images
Classification
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-32203
vendor-advisory, patch, web, advisory
-
access.redhat.com
/errata/RHSA-2026:13281
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:13280
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:8467
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:8470
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:8472
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:8473
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:8468
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:8475
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:13693
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:13283
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:13282
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:8471
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:8469
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:8474
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:9077
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:9080
vendor-advisory, web
-
access.redhat.com
/errata/RHSA-2026:9205
vendor-advisory, web
-
access.redhat.com
/security/cve/CVE-2026-32203
vdb-entry, web
-
bugzilla.redhat.com
/show_bug.cgi?id=2457740
issue-tracking, web
-
security.access.redhat.com
/data/csaf/v2/vex/2026/cve-2026-32203.json
web
-
github.com
/dotnet/runtime/security/advisories/GHSA-6588-8gv4-xfgh
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-32203
advisory, web
-
github.com
/dotnet/runtime/issues/126891
web
-
github.com
/dotnet/announcements/issues/391
web
-
github.com
/dotnet/runtime
package
Sources
- CVE List CVE-2026-32203
- GitHub Advisory GHSA-6588-8gv4-xfgh
- NVD CVE-2026-32203
- OSV BIT-dotnet-2026-32203
- OSV BIT-dotnet-sdk-2026-32203
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.