CVE-2026-26127 — dotnet
CVE-2026-26127 is a Out-of-bounds Read vulnerability in dotnet. A fix is available for dotnet — see the affected versions and patch details below.
.NET Denial of Service Vulnerability
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- 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-2026-26127.
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
Out-of-bounds read in .NET allows an unauthorized attacker to deny service over a network.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦Bitnami | dotnet | ≥ 9.0.0&&< 9.0.14 | 9.0.14 |
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 9.0.14 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-26127 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-2026-26127 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2026-26127. 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.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Enterprise Linux 10 | dotnet9.0-0:9.0.115-1.el10_1 | RHSA-2026:4450 |
| Red Hat Enterprise Linux 10 | dotnet10.0-0:10.0.104-1.el10_1 | RHSA-2026:4453 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | dotnet9.0-0:9.0.115-1.el10_0 | RHSA-2026:10083 |
| Red Hat Enterprise Linux 8 | dotnet9.0-0:9.0.115-1.el8_10 | RHSA-2026:4443 |
| Red Hat Enterprise Linux 8 | dotnet10.0-0:10.0.104-1.el8_10 | RHSA-2026:4458 |
| Red Hat Enterprise Linux 9 | dotnet10.0-0:10.0.104-1.el9_7 | RHSA-2026:4445 |
| Red Hat Enterprise Linux 9 | dotnet9.0-0:9.0.115-1.el9_7 | RHSA-2026:4456 |
| Red Hat Enterprise Linux 9.6 Extended Update Support | dotnet9.0-0:9.0.115-1.el9_6 | RHSA-2026:10085 |
Frequently Asked Questions
Is CVE-2026-26127 in your dependencies?
O3 Security finds CVE-2026-26127 across Bitnami dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.