What is CVE-2026-26731?

CVE-2026-26731 is a high-severity vulnerability in Totolink A3002ru Firmware, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2026-02-17.

How severe is CVE-2026-26731?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Totolink A3002ru Firmware

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 formDnsv6 function.

Vulnerability class: Buffer Overflow

Published 2026-02-17 · last modified 2026-09-21.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.013 · change: +0.008

Affected products

Totolink A3002ru Firmware — versions 2.1.1-b20211108.1455
Totolink A3002ru-V2

Weakness classification (CWE)

References

github.com/0xmania/cve/tree/main/TOTOLINK-A3002RU-boa-formDnsv6-StackOverflow (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-26731?: CVE-2026-26731 is a high-severity vulnerability in Totolink A3002ru Firmware, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2026-02-17.
How severe is CVE-2026-26731?: High severity. CVSS v3 base score is 8.8 out of 10.