9.4

CVE-2026-88092: microsoft asp.net_core HTTP Request/Response Smuggling

CVSS: 9.4v3.1CriticalAnalyzed
AliasesGHSA-rv87-ccxw-8ggfCGA-2h53-ffw3-3g6hCGA-82v8-pqcc-h2qw
Published 13-10-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-88092 is a critical (CVSS 9.4) HTTP Request/Response Smuggling vulnerability in microsoft asp.net_core. EPSS estimates a 0.79% chance of exploitation in the next 30 days, higher than 55.2% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.4/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.79%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 13-10-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to perform tampering over a network.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.79%

Chance of exploitation in the next 30 days

Percentile

55%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

14-10-202618-10-2026
EPSS score
0.79%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

NuGet11 products
  • Microsoft.AspNetCore.App.Runtime.linux-arm≥ 8.0.0, < 8.0.32 | ≥ 10.0.0, < 10.0.13 | ≥ 11.0.0-preview.1, < 11.0.0-rc.2 | ≥ 9.0.0, < 9.0.21
  • Microsoft.AspNetCore.App.Runtime.linux-arm64≥ 8.0.0, < 8.0.32 | ≥ 10.0.0, < 10.0.13 | ≥ 11.0.0-preview.1, < 11.0.0-rc.2 | ≥ 9.0.0, < 9.0.21
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm≥ 8.0.0, < 8.0.32 | ≥ 10.0.0, < 10.0.13 | ≥ 11.0.0-preview.1, < 11.0.0-rc.2 | ≥ 9.0.0, < 9.0.21
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm64≥ 8.0.0, < 8.0.32 | ≥ 10.0.0, < 10.0.13 | ≥ 11.0.0-preview.1, < 11.0.0-rc.2 | ≥ 9.0.0, < 9.0.21
  • Microsoft.AspNetCore.App.Runtime.linux-musl-x64≥ 8.0.0, < 8.0.32 | ≥ 10.0.0, < 10.0.13 | ≥ 11.0.0-preview.1, < 11.0.0-rc.2 | ≥ 9.0.0, < 9.0.21
Microsoft9 products
Chainguard2 products
  • dotnet-bootstrap-8All versions (No fix recorded)
  • dotnet-bootstrap-9All versions (No fix recorded)
Wolfi2 products
  • dotnet-bootstrap-8All versions (No fix recorded)
  • dotnet-bootstrap-9All versions (No fix recorded)

4 vendors · 24 products

References

4 links