CVE-2026-62909 — dotnet
CVE-2026-62909 is a CWE-252 vulnerability in dotnet. A fix is available for dotnet — see the affected versions and patch details below.
.NET Elevation of Privilege Vulnerability
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-62909.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Real-World Exposure
dotnetReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Bitnami packages — download data is not available via public APIs for these ecosystems.
Description
Uncaught exception in .NET allows an authorized attacker to elevate privileges locally.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦Bitnami | dotnet | ≥ 8.0.0&&< 8.0.30 | 8.0.30 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for dotnet, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update dotnet to 8.0.30 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-62909 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-62909 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2026-62909. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This vulnerability is rated as Important. A truncation error in the .NET diagnostics IPC, specifically within ipc_transport_get_default_name when processing excessively long TMPDIR paths, could lead to a local elevation of privilege. This allows an attacker with local access to potentially gain higher privileges on…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Enterprise Linux 10 | dotnet8.0-0:8.0.130-1.el10_2 | RHSA-2026:54541 |
| Red Hat Enterprise Linux 10 | dotnet9.0-0:9.0.120-1.el10_2 | RHSA-2026:54590 |
| Red Hat Enterprise Linux 10 | dotnet10.0-0:10.0.111-1.el10_2 | RHSA-2026:55858 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | dotnet8.0-0:8.0.130-1.el10_0 | RHSA-2026:58566 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | dotnet9.0-0:9.0.120-1.el10_0 | RHSA-2026:58567 |
| Red Hat Enterprise Linux 8 | dotnet8.0-0:8.0.130-1.el8_10 | RHSA-2026:54538 |
| Red Hat Enterprise Linux 8 | dotnet10.0-0:10.0.111-1.el8_10 | RHSA-2026:54542 |
| Red Hat Enterprise Linux 8 | dotnet9.0-0:9.0.120-1.el8_10 | RHSA-2026:54550 |
Frequently Asked Questions
Is CVE-2026-62909 in your dependencies?
O3 Security finds CVE-2026-62909 across Bitnami dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.