# CVE-2026-42799: Out-of-bounds read in ulp

> An out-of-bounds read in the ASR Kestrel power control module allows attackers to cause denial of service or disclose sensitive memory information.

- **Severity:** High 7.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Apr 2026
- **Updated:** 30 Apr 2026
- **Also known as:** GHSA-5xgh-84j5-pq8w

## What is CVE-2026-42799?

CVE-2026-42799 is a high-severity memory corruption vulnerability in ASR Kestrel, published on 30 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Out-of-bounds read vulnerability in ASR Kestrel (nr_fw modules) allows Overflow Buffers.

 This vulnerability is associated with program files Code/Nr/nr_fw/RA/src/NrPwrCtrl.C.

This issue affects Kestrel: before 2026/02/10.

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

## Which versions are affected by CVE-2026-42799?

It affects 1 product.


Products: Asrmicro Asr1803 Firmware.

## How do I fix CVE-2026-42799?

No fix has been published for CVE-2026-42799 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-42799 being exploited?

There is no known exploitation of CVE-2026-42799 in the wild and no public exploit code.

## Other vulnerabilities in ASR Kestrel

- [CVE-2023-49701](https://insights.sbomify.com/CVE-2023-49701/): Out-of-bounds access a buffer in SIM management (high 7.2)
- [CVE-2023-49699](https://insights.sbomify.com/CVE-2023-49699/): Out-of-bounds access a buffer in IMS (medium 6.7)
- [CVE-2023-49700](https://insights.sbomify.com/CVE-2023-49700/): Buffer Copy Without Checking size of input in IMS (medium 6.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-42799 and fix it if it is affected.

What it is: CVE-2026-42799 is a high-severity memory corruption vulnerability in ASR Kestrel, published on 30 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-42799 in the wild and no public exploit code.

Affected product: ASR Kestrel. 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-2026-42799/ (Markdown: https://insights.sbomify.com/CVE-2026-42799/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-42799
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42799
- OSV: https://osv.dev/vulnerability/CVE-2026-42799

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-42799/
Summaries are generated and may contain mistakes; the official description above is the record.