Skip to content
Noroxi
CVE-2026-62899· NVD / CVE Program· CNA microsoft

.NET Security Feature Bypass Vulnerability

Noroxi assessment

Priority: Monitor (action score 23/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.74% (FIRST EPSS); higher than 54% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: .NET 10.0 installed on Linux 10.0.11; .NET 10.0 installed on Mac OS 10.0.11; .NET 8.0 installed on Linux 8.0.30.

Low priority for now. Upgrade to .NET 10.0 installed on Linux 10.0.11; .NET 10.0 installed on Mac OS 10.0.11; .NET 8.0 installed on Linux 8.0.30 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.

MediumCVSS 5.9 · v3.1—No exploit Fix available
Published
Aug 11, 2026
Updated
Oct 8, 2026
EPSS
0.7% · 54th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
5.9
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-62899

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for microsoft records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
microsoftvisual studio 2022
microsoftvisual studio 2026
microsoft.net
microsoftwindows
applemacos
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft .net8.0.0 and later · before 8.0.30
  • microsoft .net9.0.0 and later · before 9.0.19
  • microsoft .net10.0.0 and later · before 10.0.11
  • microsoft visual studio 202217.14.0 and later · before 17.14.38
  • microsoft visual studio 202618.8.0 and later · before 18.8.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft .NET 10.0

    • 10.0.0 and later · before 10.0.11affected

  • Microsoft .NET 8.0

    • 8.0.0 and later · before 8.0.30affected

  • Microsoft .NET 9.0

    • 9.0.0 and later · before 9.0.19affected

  • Microsoft Microsoft Visual Studio 2022 version 17.14

    • 17.14.0 and later · before 17.14.38affected

  • Microsoft Microsoft Visual Studio 2026 version 18.8

    • 18.0 and later · before 18.8.3affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10aspnetcore-runtime-10.0before 10.0.11-1.el10_210.0.11-1.el10_2
AlmaLinux:10aspnetcore-runtime-8.0before 8.0.30-1.el10_28.0.30-1.el10_2
AlmaLinux:10aspnetcore-runtime-9.0before 9.0.19-1.el10_29.0.19-1.el10_2
AlmaLinux:10aspnetcore-runtime-dbg-10.0before 10.0.11-1.el10_210.0.11-1.el10_2
AlmaLinux:10aspnetcore-runtime-dbg-8.0before 8.0.30-1.el10_28.0.30-1.el10_2
AlmaLinux:10aspnetcore-runtime-dbg-9.0before 9.0.19-1.el10_29.0.19-1.el10_2
AlmaLinux:10aspnetcore-targeting-pack-10.0before 10.0.11-1.el10_210.0.11-1.el10_2
AlmaLinux:10aspnetcore-targeting-pack-8.0before 8.0.30-1.el10_28.0.30-1.el10_2
AlmaLinux:10aspnetcore-targeting-pack-9.0before 9.0.19-1.el10_29.0.19-1.el10_2
AlmaLinux:10dotnet-apphost-pack-10.0before 10.0.11-1.el10_210.0.11-1.el10_2
AlmaLinux:10dotnet-apphost-pack-8.0before 8.0.30-1.el10_28.0.30-1.el10_2
AlmaLinux:10dotnet-apphost-pack-9.0before 9.0.19-1.el10_29.0.19-1.el10_2
AlmaLinux:10dotnet-hostbefore 10.0.11-1.el10_210.0.11-1.el10_2
AlmaLinux:10dotnet-hostfxr-10.0before 10.0.11-1.el10_210.0.11-1.el10_2
AlmaLinux:10dotnet-hostfxr-8.0before 8.0.30-1.el10_28.0.30-1.el10_2
AlmaLinux:10dotnet-hostfxr-9.0before 9.0.19-1.el10_29.0.19-1.el10_2
AlmaLinux:10dotnet-runtime-10.0before 10.0.11-1.el10_210.0.11-1.el10_2
AlmaLinux:10dotnet-runtime-8.0before 8.0.30-1.el10_28.0.30-1.el10_2
AlmaLinux:10dotnet-runtime-9.0before 9.0.19-1.el10_29.0.19-1.el10_2
AlmaLinux:10dotnet-runtime-dbg-10.0before 10.0.11-1.el10_210.0.11-1.el10_2
AlmaLinux:10dotnet-runtime-dbg-8.0before 8.0.30-1.el10_28.0.30-1.el10_2
AlmaLinux:10dotnet-runtime-dbg-9.0before 9.0.19-1.el10_29.0.19-1.el10_2
AlmaLinux:10dotnet-sdk-10.0before 10.0.111-1.el10_210.0.111-1.el10_2
AlmaLinux:10dotnet-sdk-10.0-source-built-artifactsbefore 10.0.111-1.el10_210.0.111-1.el10_2

+96

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-36758Visual Studio Elevation of Privilege Vulnerability
    39Monitor
  • CVE-2026-71328.NET and Visual Studio Remote Code Execution Vulnerability
    35Monitor
  • CVE-2026-21256GitHub Copilot and Visual Studio Remote Code Execution Vulnerability
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-62886Aug 11, 2026 · .NET Elevation of Privilege Vulnerability
    31Monitor
  • ← EarlierCVE-2026-62898Aug 11, 2026 · Microsoft QUIC Information Disclosure Vulnerability
    30Monitor
  • Later →CVE-2026-62900Aug 11, 2026 · .NET Information Disclosure Vulnerability
    23Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
.NET 10.0 installed on Linux10.0.11 · KB5122106Microsoft (MSRC)
.NET 10.0 installed on Mac OS10.0.11 · KB5122106Microsoft (MSRC)
.NET 8.0 installed on Linux8.0.30 · KB5122104Microsoft (MSRC)
.NET 8.0 installed on Mac OS8.0.30 · KB5122104Microsoft (MSRC)
.NET 8.0 installed on Windows8.0.30 · KB5122104Microsoft (MSRC)
.NET 9.0 installed on Linux9.0.19 · KB5122105Microsoft (MSRC)
.NET 9.0 installed on Mac OS9.0.19 · KB5122105Microsoft (MSRC)
.NET 9.0 installed on Windows9.0.19 · KB5122105Microsoft (MSRC)
Microsoft Visual Studio 2022 version 17.1417.14.38Microsoft (MSRC)
Microsoft Visual Studio 2026 version 18.818.8.3Microsoft (MSRC)
almalinux:aspnetcore-runtime-8.08.0.30-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:aspnetcore-runtime-dbg-8.08.0.30-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:aspnetcore-targeting-pack-8.08.0.30-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:dotnet-apphost-pack-8.08.0.30-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:dotnet-hostfxr-8.08.0.30-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:dotnet-runtime-8.08.0.30-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:dotnet-runtime-dbg-8.08.0.30-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:dotnet-sdk-8.08.0.130-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:dotnet-sdk-8.0-source-built-artifacts8.0.130-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:dotnet-sdk-dbg-8.08.0.130-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:dotnet-targeting-pack-8.08.0.30-1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:dotnet-templates-8.08.0.130-1.el8_10 · AlmaLinux:8Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-arm10.0.11Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-arm8.0.30Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-arm9.0.19Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-arm6410.0.11Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-arm648.0.30Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-arm649.0.19Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-musl-arm10.0.11Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-musl-arm8.0.30Package registry (OSV)

+37

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records