# CVE-2026-54772: CoreWCF: Pre-authentication infinite-loop CPU exhaustion in CoreWCF net.tcp / net.pipe / net.uds framing handshake

> Unauthenticated attackers can cause CPU exhaustion and denial of service in CoreWCF applications by triggering infinite loops during network framing handshakes.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 Jul 2026
- **Updated:** 9 Jul 2026
- **Also known as:** GHSA-p86g-xrr2-pf7c

## What is CVE-2026-54772?

CVE-2026-54772 is a high-severity denial of service vulnerability in CoreWCF, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, an unauthenticated remote attacker that can reach a NetTcpBinding, NetNamedPipeBinding, or UnixDomainSocketBinding endpoint can trigger premature EOF handling in the CoreWCF net.tcp, net.pipe, or net.uds framing handshake and pin one server thread-pool worker at full CPU per connection. This issue is fixed in versions 1.8.1 and 1.9.1.

Weakness: CWE-835 (Loop with Unreachable Exit Condition), CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2026-54772?

4 open source packages ship an affected version, including CoreWCF.NetFramingBase.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `CoreWCF.NetFramingBase` | NuGet | All versions | 1.8.1 |
| `CoreWCF.NetFramingBase` | NuGet | All versions | 1.8.1 |
| `CoreWCF.NetFramingBase` | NuGet | From 1.9.0 | 1.9.1 |
| `CoreWCF.NetFramingBase` | NuGet | From 1.9.0 | 1.9.1 |

## How do I fix CVE-2026-54772?

Upgrade CoreWCF.NetFramingBase to a fixed version for your release line: 1.8.1 or 1.9.1.

## Is CVE-2026-54772 being exploited?

There is no known exploitation of CVE-2026-54772 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54772 and fix it if it is affected.

What it is: CVE-2026-54772 is a high-severity denial of service vulnerability in CoreWCF, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-54772 in the wild and no public exploit code.

Affected packages and fixed versions:
- CoreWCF.NetFramingBase (NuGet): affected all versions; fixed in 1.8.1
- CoreWCF.NetFramingBase (NuGet): affected all versions; fixed in 1.8.1
- CoreWCF.NetFramingBase (NuGet): affected from 1.9.0; fixed in 1.9.1
- CoreWCF.NetFramingBase (NuGet): affected from 1.9.0; fixed in 1.9.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-54772/ (Markdown: https://insights.sbomify.com/CVE-2026-54772/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54772
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54772
- OSV: https://osv.dev/vulnerability/CVE-2026-54772

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54772/
Summaries are generated and may contain mistakes; the official description above is the record.