# CVE-2026-50076: Apache Fory: Java ReplaceResolverSerializer deserialization checks bypass


- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 4 Jun 2026
- **Updated:** 4 Jun 2026
- **Also known as:** GHSA-8f39-v287-78jf

## What is CVE-2026-50076?

CVE-2026-50076 is a critical vulnerability in Apache Fory, published on 4 Jun 2026. 

### Official description

Deserialization of Untrusted Data in the Java replace-resolve path in Apache Fory fory-core Java SDK before 1.1.0 on Java/JVM platforms allows a remote attacker to bypass class registration, TypeChecker, and DisallowedList checks and invoke classpath-present readResolve/readExternal hooks via crafted Fory serialized data.

Users are recommended to upgrade to version 1.1.0 or later, which fixes this issue.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2026-50076?

2 open source packages ship an affected version, including org.apache.fory:fory-core. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.apache.fory:fory-core` | Maven | All versions | 1.1.0 |
| `org.apache.fory:fory-core` | Maven | All versions | 1.1.0 |

Products: Apache Fory.

## How do I fix CVE-2026-50076?

Upgrade org.apache.fory:fory-core to 1.1.0 or later.

## Is CVE-2026-50076 being exploited?

There is no known exploitation of CVE-2026-50076 in the wild and no public exploit code.

## Other vulnerabilities in Apache Fory

- [CVE-2026-71558](https://insights.sbomify.com/CVE-2026-71558/): Apache Fory: Heap type confusion in C++ polymorphic smart-pointer deserialization (critical 9.8)
- [CVE-2026-64606](https://insights.sbomify.com/CVE-2026-64606/): Apache Fory, Apache Fory: Class-registration bypass through an auto-admitted SerializedLambda capturing interface (critical 9.8)
- [CVE-2026-64608](https://insights.sbomify.com/CVE-2026-64608/): Apache Fory: Heap type confusion and out-of-bounds read/write in C++ compatible-mode field-skip paths (critical 9.8)
- [CVE-2026-48207](https://insights.sbomify.com/CVE-2026-48207/): Apache Fory: PyFory ReduceSerializer Incomplete Policy Enforcement (critical 9.8)
- [CVE-2025-61622](https://insights.sbomify.com/CVE-2025-61622/): Apache Fory, Apache Fory: Python RCE via unguarded pickle fallback serializer in pyfory (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-50076 and fix it if it is affected.

What it is: CVE-2026-50076 is a critical vulnerability in Apache Fory, published on 4 Jun 2026. 
Exploitation: There is no known exploitation of CVE-2026-50076 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.apache.fory:fory-core (Maven): affected all versions; fixed in 1.1.0
- org.apache.fory:fory-core (Maven): affected all versions; fixed in 1.1.0

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-2026-50076/ (Markdown: https://insights.sbomify.com/CVE-2026-50076/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-50076
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-50076
- OSV: https://osv.dev/vulnerability/CVE-2026-50076

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-50076/
Summaries are generated and may contain mistakes; the official description above is the record.