CVE-2026-69304: microsoft asp.net_core
CVSS: 5.9v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-69304CGA-3m66-c3hm-cx8gCGA-8jfj-4fwh-w26vCGA-9885-x93g-j8ggCGA-9g77-2vfp-vjwcCGA-wh8q-wmpq-27w9GHSA-8cp2-47hg-mfghBIT-aspnet-core-2026-69304BIT-dotnet-2026-69304BIT-dotnet-sdk-2026-69304
Published 08-09-2026Last modified 14-10-2026
Vulnerability summary
CVE-2026-69304 is a medium (CVSS 5.9) vulnerability in microsoft asp.net_core. EPSS estimates a 0.88% chance of exploitation in the next 30 days, higher than 58.3% of scored vulnerabilities.
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)EPSS score
0.88%
0%100%
Low · +0.11 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 08-09-2026PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
Description
Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.
CVSS metrics
6 scores · 6 sources · 1 versionMedium 5.9Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:CSourcesAll 6 agree
- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · WolfiEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · NugetEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.88%
Chance of exploitation in the next 30 days
Percentile
58%
Versus all other CVEs
30-day change
+0.11 pp
From 0.77% on 19-09-2026
19-09-202619-10-2026
EPSS score0.88%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft13 products
- asp.net_core≥ 8.0.0, < 8.0.28 | ≥ 9.0.0, < 9.0.17 | ≥ 10.0.0, < 10.0.9 | > 11.0.0 (No fix recorded) | 11.0:rc1
- asp.net core 10.0≥ 10.0, < 10.0.12
- asp.net core 11.0≥ 11.0, < 11.0 RC1
- asp.net core 8.0≥ 8.0, < 8.0.31
- asp.net core 9.0≥ 9.0, < 9.0.20
Chainguard3 products
- aspnet-8-targeting-pack< 8.0.131-r0
- dotnet-bootstrap-8All versions (No fix recorded) | < 8.0.132-r0
- dotnet-bootstrap-9All versions (No fix recorded) | < 9.0.122-r0
Wolfi3 products
- aspnet-8-targeting-pack< 8.0.131-r0
- dotnet-bootstrap-8All versions (No fix recorded) | < 8.0.132-r0
- dotnet-bootstrap-9All versions (No fix recorded) | < 9.0.122-r0
NuGet1 product
- Microsoft.AspNetCore.Server.IISIntegration≥ 11.0.0-preview.1, < 11.0.0-rc.1 | ≥ 8.0.0, < 8.0.31 | ≥ 9.0.0, < 9.0.20 | ≥ 10.0.0, < 10.0.12
Ubuntu1 product
- dotnet7All versions (No fix recorded)
5 vendors · 21 products
References
8 links
- github.com/dotnet/aspnetcorePACKAGE