CVE-2026-70188
ASP.NET Core Security Feature Bypass Vulnerability
- Published
- Updated
- Reserved
- Assigned by
- microsoft
Description
Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network.
Timeline
ID reserved
By microsoft
- 2 months later
· 2 months later
Published
- 18 days later
· 18 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoftCNA (assigner) | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C |
| NVDNVD · Awaiting Analysis | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.94% · top 39% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Weakness
Affected products
- affected 10.0 – < 10.0.13
- affected 11.0 – < 11.0.0-rc.2
- affected 8.0 – < 8.0.32
- affected 9.0 – < 9.0.21
Microsoft · Microsoft Visual Studio 2022 version 17.14
- affected 17.14.0 – < 17.14.42
Microsoft · Microsoft Visual Studio 2026 version 18.10
- affected 18.10.0 – < 18.10.4
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-armGHSA-fpq8-4vhr-rcxx (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-arm64GHSA-fpq8-4vhr-rcxx (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-armGHSA-fpq8-4vhr-rcxx (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-arm64GHSA-fpq8-4vhr-rcxx (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-x64GHSA-fpq8-4vhr-rcxx (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-x64GHSA-fpq8-4vhr-rcxx (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.osx-arm64GHSA-fpq8-4vhr-rcxx (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.osx-x64GHSA-fpq8-4vhr-rcxx (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-arm64GHSA-fpq8-4vhr-rcxx (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-x64GHSA-fpq8-4vhr-rcxx (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-x86GHSA-fpq8-4vhr-rcxx (opens in a new tab)
References (1)
- ASP.NET Core Security Feature Bypass Vulnerability (opens in a new tab)vendor-advisorypatch
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-fpq8-4vhr-rcxx (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-70188)Record last updated .