CVE-2026-45491

Publication date 9 June 2026

Last updated 18 June 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.2 · Medium

Score breakdown

Description

Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.

Read the notes from the security team

Status

Package Ubuntu Release Status
dotnet6 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble Not in release
22.04 LTS jammy
Vulnerable, fix deferred
20.04 LTS focal Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
dotnet7 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored see notes
20.04 LTS focal Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
dotnet8 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing
Fixed in 8.0.128-8.0.28-0ubuntu1~25.10.1
24.04 LTS noble
Fixed in 8.0.128-8.0.28-0ubuntu1~24.04.1
22.04 LTS jammy
Fixed in 8.0.128-8.0.28-0ubuntu1~22.04.1
20.04 LTS focal Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
dotnet9 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing
Fixed in 9.0.118-9.0.17-0ubuntu1~25.10.1
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
dotnet10 26.10 stonking
Fixed in 10.0.109-10.0.9-0ubuntu1
26.04 LTS resolute
Fixed in 10.0.109-10.0.9-0ubuntu1~26.04.1
25.10 questing
Fixed in 10.0.109-10.0.9-0ubuntu1~25.10.1
24.04 LTS noble
Fixed in 10.0.109-10.0.9-0ubuntu1~24.04.1
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release

Notes

iconstantin

.NET 7 is end of life upstream.

mdeslaur

Marking .NET 6 as deferred until information is available to determine if it is impacted.

Severity score breakdown

CVSS version: CVSS v3.0

Base score 6.2 · Medium

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Related Ubuntu Security Notices (USN)

Other references

Access our resources on patching vulnerabilities