How severe is CVE-2026-26731?

CVE-2026-26731 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-26731 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26731?

CVE-2026-26731 affects Totolink A3002ru Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-26731?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-26731 have an EU (EUVD) identifier?

Yes. CVE-2026-26731 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7830.

When was CVE-2026-26731 published?

CVE-2026-26731 was published on 2026-02-17 and last updated on 2026-06-17.

CVE-2026-26731

CVE-2026-26731 is a high-severity vulnerability in Totolink A3002ru Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7830
Weakness: CWE-787
Affected product: Totolink A3002ru Firmware
Published: 2026-02-17
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-26731?: CVE-2026-26731 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-26731 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26731?: CVE-2026-26731 affects Totolink A3002ru Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-26731?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-26731 have an EU (EUVD) identifier?: Yes. CVE-2026-26731 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7830.
When was CVE-2026-26731 published?: CVE-2026-26731 was published on 2026-02-17 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:o:totolink:a3002ru_firmware:2.1.1-b20211108.1455:*:*:*:*:*:*:*

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