# CVE-2026-31048: Deserialization in n/a

> Attackers can execute arbitrary code by sending crafted pickled messages to applications using the Pyro v3.x library.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Apr 2026
- **Updated:** 15 Apr 2026
- **Also known as:** UBUNTU-CVE-2026-31048

## What is CVE-2026-31048?

CVE-2026-31048 is a critical unsafe deserialization vulnerability in n/a, published on 13 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue in the <code>pickle</code> protocol of Pyro v3.x allows attackers to execute arbitrary code via supplying a crafted pickled string message.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-31048?


## How do I fix CVE-2026-31048?

No fix has been published for CVE-2026-31048 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-31048 being exploited?

There is no known exploitation of CVE-2026-31048 in the wild and no public exploit code.

Public exploit code:

- Security advisory for CVE-2026-31048 (github_poc): https://github.com/Sif-0x01/security-advisories

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-31048 and fix it if it is affected.

What it is: CVE-2026-31048 is a critical unsafe deserialization vulnerability in n/a, published on 13 Apr 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-2026-31048 in the wild and no public exploit code.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-31048/ (Markdown: https://insights.sbomify.com/CVE-2026-31048/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-31048
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31048
- OSV: https://osv.dev/vulnerability/CVE-2026-31048

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-31048/
Summaries are generated and may contain mistakes; the official description above is the record.