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CVE-2026-45491VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Affects Red HatSource 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 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
6.2Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 32% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
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 30 Oct 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 advises applying the relevant security updates included in the RPM packages listed in the advisory to remediate the vulnerabilities. No practical temporary workaround is available that meets Red Hat's standards for usability and stability. Users should follow Red Hat's update instructions at https://images.redhat.com/ to apply the fixes.

Description

A security update for Red Hat Hardened Images RPMs addresses multiple vulnerabilities including a denial of service flaw in ASP.NET Core SignalR and Blazor Server. The issue involves processing deeply nested MessagePack arrays that can cause excessive recursion and a stack overflow, leading to application termination. This vulnerability allows unauthenticated remote attackers to cause denial of service. Red Hat has released updated RPM packages to fix these issues.

References

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