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CVE-2026-45491VulnerabilityPublished Updated

Red Hat Security Advisory: .NET 8.0 security update

Affects Red Hat .NET 8.0Source GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-45491· Medium 6.2

Not known to be exploited · CVSS 6.2 Medium · fixed in Red Hat package updates : update Red Hat .NET 8.0 when convenient.

Data as of 6 Nov 2026, 01:49 UTC

CVSS 3.1 base score
6.2Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 10.0.9, 8.0.28, 9.0.17
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Upgrade .NET to 10.0.9 (10.0) or 8.0.28 (8.0) or 9.0.17 (9.0).

Affected software

ProductAffectedFixed in
Microsoft.NET 10.0Affected
  • >=10.0.0 <10.0.9
Fixed in
  • 10.0.9
Microsoft.NET 8.0Affected
  • >=8.0 <8.0.28
Fixed in
  • 8.0.28
Microsoft.NET 8.0Affected
  • >=8.0.0 <8.0.28
Fixed in
  • 8.0.28
Microsoft.NET 9.0Affected
  • >=9.0.0 <9.0.17
Fixed in
  • 9.0.17

AI-suggested

Red Hat has released updated .NET SDK and Runtime packages (8.0.128 and 8.0.28 respectively) that fix these vulnerabilities. Users of affected Red Hat Enterprise Linux 9.6 Extended Update Support versions should apply these updates promptly. Detailed update instructions are available from Red Hat's official advisory and article. No additional mitigation actions are indicated beyond applying the official patches.

Description

.NET 8.0 has been updated to address two security vulnerabilities: a local file tampering issue via link following (CVE-2026-45491) and a denial of service vulnerability in ASP.NET Core caused by uncontrolled resource consumption (CVE-2026-45591). These vulnerabilities affect the .NET SDK and Runtime versions prior to the patched releases. Red Hat has released updated packages for Red Hat Enterprise Linux 9.6 Extended Update Support to remediate these issues.

References

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