# CVE-2023-50926: Unvalidated DIO prefix info length in RPL-Lite in Contiki-NG

> An attacker can trigger an out-of-bounds read in Contiki-NG via a malformed DIO message, potentially causing information disclosure or denial of service.

- **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:** No
- **Published:** 14 Feb 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-jp4p-fq85-jch2

## What is CVE-2023-50926?

CVE-2023-50926 is a high-severity memory corruption vulnerability in contiki-ng, published on 14 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds read can be caused by an incoming DIO message when using the RPL-Lite implementation in the Contiki-NG operating system. More specifically, the prefix information of the DIO message contains a field that specifies the length of an IPv6 address prefix. The value of this field is not validated, which means that an attacker can set a value that is longer than the maximum prefix length. Subsequently, a memcmp function call that compares different prefixes can be called with a length argument that surpasses the boundary of the array allocated for the prefix, causing an out-of-bounds read. The problem has been patched in the "develop" branch of Contiki-NG, and is expected to be included in the next release. Users are advised to update as soon as they are able to or to manually apply the changes in Contiki-NG pull request #2721.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2023-50926?

It affects 1 product.


Products: Contiki-Ng Contiki-Ng.

## How do I fix CVE-2023-50926?

No fix has been published for CVE-2023-50926 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-50926 being exploited?

There is no known exploitation of CVE-2023-50926 in the wild and no public exploit code.

## Other vulnerabilities in contiki-ng

- [CVE-2018-19417](https://insights.sbomify.com/CVE-2018-19417/): Memory corruption in n/a (critical 10.0)
- [CVE-2023-30546](https://insights.sbomify.com/CVE-2023-30546/): Contiki-NG has off-by-one error in Antelope DBMS (critical 9.8)
- [CVE-2020-24336](https://insights.sbomify.com/CVE-2020-24336/): Memory corruption in n/a (critical 9.8)
- [CVE-2020-14934](https://insights.sbomify.com/CVE-2020-14934/): Memory corruption in n/a (critical 9.8)
- [CVE-2020-14935](https://insights.sbomify.com/CVE-2020-14935/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-50926 and fix it if it is affected.

What it is: CVE-2023-50926 is a high-severity memory corruption vulnerability in contiki-ng, published on 14 Feb 2024. 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-2023-50926 in the wild and no public exploit code.

Affected product: contiki-ng. 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-2023-50926/ (Markdown: https://insights.sbomify.com/CVE-2023-50926/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-50926
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-50926
- OSV: https://osv.dev/vulnerability/CVE-2023-50926

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-50926/
Summaries are generated and may contain mistakes; the official description above is the record.