# CVE-2026-108896: Linksys E1700 setLinksysIpv6 os command injection

> Remote attackers can execute arbitrary OS commands on Linksys E1700 routers via the setLinksysIpv6 function, posing a critical security risk.

- **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:** 12 Oct 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-4jv4-xw7r-ghwf

## What is CVE-2026-108896?

CVE-2026-108896 is a critical command injection vulnerability in Linksys E1700, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in Linksys E1700 1.0.0.4.003. This affects the function setLinksysIpv6 of the file /goform/setLinksysIpv6. The manipulation of the argument _6rd_prefix/_6rd_prefix_len results in os command injection. The attack can be launched remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2026-108896?


## How do I fix CVE-2026-108896?

No fix has been published for CVE-2026-108896 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-108896 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108896 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-108896 and fix it if it is affected.

What it is: CVE-2026-108896 is a critical command injection vulnerability in Linksys E1700, published on 12 Oct 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-2026-108896 exists.

Affected product: Linksys E1700. 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-2026-108896/ (Markdown: https://insights.sbomify.com/CVE-2026-108896/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-108896
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108896
- OSV: https://osv.dev/vulnerability/CVE-2026-108896

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-108896/
Summaries are generated and may contain mistakes; the official description above is the record.