# CVE-2025-62526: OpenWrt ubusd vulnerable to heap buffer overflow

> Heap buffer overflow in ubusd allows arbitrary code execution and ACL bypass before checks, affecting OpenWrt embedded devices.

- **Severity:** High 7.9 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 22 Oct 2025
- **Updated:** 22 Oct 2025
- **Also known as:** GHSA-cp32-65v4-cp73, ROOT-OS-UBUNTU-2204-CVE-2025-62526

## What is CVE-2025-62526?

CVE-2025-62526 is a high-severity memory corruption vulnerability in Openwrt Openwrt, published on 22 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

OpenWrt Project is a Linux operating system targeting embedded devices. Prior to version 24.10.4, ubusd contains a heap buffer overflow in the event registration parsing code. This allows an attacker to modify the head and potentially execute arbitrary code in the context of the ubus daemon. The affected code is executed before running the ACL checks, all ubus clients are able to send such messages. In addition to the heap corruption, the crafted subscription also results in a bypass of the listen ACL. This is fixed in OpenWrt 24.10.4. There are no workarounds.

Weakness: CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2025-62526?

It affects 1 product.


Products: Openwrt Openwrt.

## How do I fix CVE-2025-62526?

Upgrade to a fixed version.

## Is CVE-2025-62526 being exploited?

There is no known exploitation of CVE-2025-62526 in the wild and no public exploit code.

## Other vulnerabilities in Openwrt Openwrt

- [CVE-2020-28951](https://insights.sbomify.com/CVE-2020-28951/): Use after free in n/a (critical 9.8)
- [CVE-2026-62948](https://insights.sbomify.com/CVE-2026-62948/): Cross-site scripting in openwrt (critical 9.6)
- [CVE-2026-30871](https://insights.sbomify.com/CVE-2026-30871/): OpenWrt Project has Stack-based Buffer Overflow in DNS PTR Query (critical 9.5)
- [CVE-2026-30872](https://insights.sbomify.com/CVE-2026-30872/): OpenWrt Project has a Stack-based Buffer Overflow vulnerability via IPv6 reverse DNS lookup (critical 9.5)
- [CVE-2021-28961](https://insights.sbomify.com/CVE-2021-28961/): Command injection in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-62526 and fix it if it is affected.

What it is: CVE-2025-62526 is a high-severity memory corruption vulnerability in Openwrt Openwrt, published on 22 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-62526 in the wild and no public exploit code.

Affected product: Openwrt Openwrt. 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-2025-62526/ (Markdown: https://insights.sbomify.com/CVE-2025-62526/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-62526
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-62526
- OSV: https://osv.dev/vulnerability/CVE-2025-62526

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-62526/
Summaries are generated and may contain mistakes; the official description above is the record.