CVE-2026-2909: Tenda HG9 Diagnostic Ping Endpoint formPing stack-based overflow

Vulnerability summary

CVE-2026-2909 is a high (CVSS 9.0) vulnerability in tenda hg9_firmware. EPSS estimates a 1.15% chance of exploitation in the next 30 days, higher than 66.5% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 22-02-2026
   PublishedVulnerability first disclosed.
2. 23-02-2026
   Last modifiedVulnerability information updated.

Description

A vulnerability was detected in Tenda HG9 300001138. This affects an unknown part of the file /boaform/formPing of the component Diagnostic Ping Endpoint. Performing a manipulation of the argument pingAddr results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may be used.

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).