CVE-2026-1425 MEDIUM

CVE-2026-1425: pymumu SmartDNS SVBC Record dns.c _dns_decode_SVCB_HTTPS stack-based overflow

Vendor Pymumu
Product SmartDNS
Weakness CWE-121
Published January 26, 2026
Last update February 23, 2026

CVSS base score

6.3/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X

What the vulnerability does

01Description

A security flaw has been discovered in pymumu SmartDNS up to 47.1. This vulnerability affects the function _dns_decode_rr_head/_dns_decode_SVCB_HTTPS of the file src/dns.c of the component SVBC Record Parser. The manipulation results in stack-based buffer overflow. It is possible to launch the attack remotely. A high complexity level is associated with this attack. It is stated that the exploitability is difficult. The patch is identified as 2d57c4b4e1add9b4537aeb403f794a084727e1c8. Applying a patch is advised to resolve this issue.

Key dates

02Disclosure timeline

January 26, 2026 CVE published
February 23, 2026 Record updated