CVE-2026-1425CWE-119CWE-121

pymumu SmartDNS SVBC Record dns.c _dns_decode_SVCB_HTTPS stack-based overflow

Medium · published January 26, 2026

CVSS v4.0
6.3
EPSS
0%
Percentile
33.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.3 · MEDIUM
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
EPSS
0.00401 · 33.2th percentile
Weaknesses
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer; CWE-121 · Stack-based Buffer Overflow
Published
2026-01-26T07:32Z
EPSS history
Timeline
  • 26 JAN 07:32Z
    pymumu SmartDNS SVBC Record dns.c _dns_decode_SVCB_HTTPS stack-based overflow
    cvelistv5