# CVE-2026-5979: D-Link DIR-605L POST Request formVirtualServ buffer overflow

> Remote attackers can trigger a buffer overflow in the D-Link DIR-605L router via a crafted POST request, potentially leading to code execution or denial of service.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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:** 9 Apr 2026
- **Updated:** 10 Apr 2026
- **Also known as:** GHSA-8w3p-hgjr-h6h4

## What is CVE-2026-5979?

CVE-2026-5979 is a high-severity memory corruption vulnerability in Dlink Dir-605l Firmware, published on 9 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was detected in D-Link DIR-605L 2.13B01. Affected by this vulnerability is the function formVirtualServ of the file /goform/formVirtualServ of the component POST Request Handler. The manipulation of the argument curTime results in buffer overflow. The attack can be launched remotely. The exploit is now public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-5979?

It affects 1 product.


Products: Dlink Dir-605l Firmware.

## How do I fix CVE-2026-5979?

No fix has been published for CVE-2026-5979 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5979 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5979 exists.

## Other vulnerabilities in Dlink Dir-605l Firmware

- [CVE-2021-40655](https://insights.sbomify.com/CVE-2021-40655/): D-Link DIR-605 Router Information Disclosure (high 7.5, exploited in the wild)
- [CVE-2026-42373](https://insights.sbomify.com/CVE-2026-42373/): D-Link DIR-605L B2 Hardcoded Telnet Backdoor Credentials (critical 9.8)
- [CVE-2023-29961](https://insights.sbomify.com/CVE-2023-29961/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-24348](https://insights.sbomify.com/CVE-2023-24348/): Memory corruption in n/a (critical 9.8)
- [CVE-2023-24349](https://insights.sbomify.com/CVE-2023-24349/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5979 and fix it if it is affected.

What it is: CVE-2026-5979 is a high-severity memory corruption vulnerability in Dlink Dir-605l Firmware, published on 9 Apr 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-2026-5979 exists.

Affected product: Dlink Dir-605l Firmware. 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-2026-5979/ (Markdown: https://insights.sbomify.com/CVE-2026-5979/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5979
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5979
- OSV: https://osv.dev/vulnerability/CVE-2026-5979

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5979/
Summaries are generated and may contain mistakes; the official description above is the record.