# CVE-2026-76003: UTT HiPER 1200GW formGroupConfig strcpy stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in the UTT HiPER 1200GW router via the timestart parameter, potentially leading to code execution or service disruption.

- **Severity:** Critical 9.4 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P`)
- **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:** 19 Aug 2026
- **Updated:** 21 Aug 2026
- **Also known as:** GHSA-6rxv-jchw-qjv3

## What is CVE-2026-76003?

CVE-2026-76003 is a critical memory corruption vulnerability in UTT HiPER 1200GW, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A weakness has been identified in UTT HiPER 1200GW up to 2.5.3-170306. Affected is the function strcpy of the file /goform/formGroupConfig. Executing a manipulation of the argument timestart can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.

Weakness: CWE-121 (Stack-based Buffer Overflow), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-76003?


## How do I fix CVE-2026-76003?

No fix has been published for CVE-2026-76003 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-76003 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-76003 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-76003 and fix it if it is affected.

What it is: CVE-2026-76003 is a critical memory corruption vulnerability in UTT HiPER 1200GW, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-76003 exists.

Affected product: UTT HiPER 1200GW. 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-2026-76003/ (Markdown: https://insights.sbomify.com/CVE-2026-76003/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-76003
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-76003
- OSV: https://osv.dev/vulnerability/CVE-2026-76003

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-76003/
Summaries are generated and may contain mistakes; the official description above is the record.