7.5

CVE-2026-42899: ASP.NET Core Denial of Service Vulnerability

Modified
AliasesRHSA-2026:17464RHSA-2026:21294RHSA-2026:21295
Published 12-05-2026Last modified 10-08-2026

Vulnerability summary

CVE-2026-42899 is a high (CVSS 7.5) Loop with Unreachable Exit Condition vulnerability in microsoft .net. EPSS estimates a 2.43% chance of exploitation in the next 30 days, higher than 84.2% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
2.43%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 2
RHSA-2026:17527RHSA-2026:17682RHSA-2026:21286RHSA-2026:21291RHSA-2026:21293RHSA-2026:24332

Timeline

  1. 12-05-2026
    PublishedVulnerability first disclosed.
  2. 10-08-2026
    Last modifiedVulnerability information updated.

Description

Loop with unreachable exit condition ('infinite loop') in ASP.NET Core allows an unauthorized attacker to deny service over a network.

CVSS metrics

8 scores · 8 sources · 1 version

EPSS trend

Probability

2.43%

Chance of exploitation in the next 30 days

Percentile

84%

Versus all other CVEs

30-day change

Decrease -0.01 pp

From 2.44% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat46 products
  • aspnetcore-runtime-10.0< 0:10.0.8-1.el8_10 | < 0:10.0.8-1.el9_8 | < 0:10.0.8-1.el10_2
  • aspnetcore-runtime-9.0< 0:9.0.16-1.el8_10 | < 0:9.0.16-1.el9_8 | < 0:9.0.16-1.el10_2 | < 0:9.0.16-1.el10_0 | < 0:9.0.16-1.el9_6
  • aspnetcore-runtime-dbg-10.0< 0:10.0.8-1.el8_10 | < 0:10.0.8-1.el9_8 | < 0:10.0.8-1.el10_2
  • aspnetcore-runtime-dbg-9.0< 0:9.0.16-1.el8_10 | < 0:9.0.16-1.el9_8 | < 0:9.0.16-1.el10_2 | < 0:9.0.16-1.el10_0 | < 0:9.0.16-1.el9_6
  • aspnetcore-targeting-pack-10.0< 0:10.0.8-1.el8_10 | < 0:10.0.8-1.el9_8 | < 0:10.0.8-1.el10_2
NuGet12 products
  • Microsoft.AspNetCore.App.Runtime.linux-arm≥ 8.0.0, < 8.0.27 | ≥ 9.0.0, < 9.0.16 | ≥ 10.0.0, < 10.0.8
  • Microsoft.AspNetCore.App.Runtime.linux-arm64≥ 8.0.0, < 8.0.27 | ≥ 9.0.0, < 9.0.16 | ≥ 10.0.0, < 10.0.8
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm≥ 8.0.0, < 8.0.27 | ≥ 9.0.0, < 9.0.16 | ≥ 10.0.0, < 10.0.8
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm64≥ 8.0.0, < 8.0.27 | ≥ 9.0.0, < 9.0.16 | ≥ 10.0.0, < 10.0.8
  • Microsoft.AspNetCore.App.Runtime.linux-musl-x64≥ 8.0.0, < 8.0.27 | ≥ 10.0.0, < 10.0.8 | ≥ 9.0.0, < 9.0.16
Ubuntu5 products
  • dotnet10< 10.0.108-10.0.8-0ubuntu1~24.04.1 | < 10.0.108-10.0.8-0ubuntu1~25.10.1 | < 10.0.108-10.0.8-0ubuntu1 | < 10.0.108-10.0.8-0ubuntu1~26.04.1
  • dotnet6All versions (No fix recorded)
  • dotnet7All versions (No fix recorded)
  • dotnet8< 8.0.127-8.0.27-0ubuntu1~22.04.1 | < 8.0.127-8.0.27-0ubuntu1~24.04.1 | < 8.0.127-8.0.27-0ubuntu1~25.10.1
  • dotnet9< 9.0.117-9.0.16-0ubuntu1~25.10.1
Microsoft4 products
  • .net≥ 8.0.0, < 8.0.27 | ≥ 9.0.0, < 9.0.16 | ≥ 10.0.0, < 10.0.8
  • .net 10.0≥ 10.0.0, < 10.0.8
  • .net 8.0≥ 8.0.0, < 8.0.27
  • .net 9.0≥ 9.0.0, < 9.0.16
Alpine3 products
  • dotnet10-runtime< 10.0.8-r0
  • dotnet8-runtime< 8.0.27-r0
  • dotnet9-runtime< 9.0.16-r0
Chainguard2 products
  • dotnet-bootstrap-8< 8.0.128-r0
  • dotnet-bootstrap-9< 9.0.118-r0
Wolfi2 products
  • dotnet-bootstrap-8< 8.0.128-r0
  • dotnet-bootstrap-9< 9.0.118-r0

7 vendors · 74 products

References

42 links
Show all 42 references