CVE-2026-1425
pymumu SmartDNS SVBC Record dns.c _dns_decode_SVCB_HTTPS stack-based overflow
- State
- Published
- Severity
- 6.3 Medium
- Published
- Jan 26, 2026
- Updated
- Feb 23, 2026
- Reserved
- Jan 25, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | 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 | VulDB |
| 3.1 | 5.6 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C | VulDB |
| 3.0 | 5.6 Medium | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C | VulDB |
| 2.0 | 5.1 Medium | AV:N/AC:H/Au:N/C:P/I:P/A:P/E:ND/RL:OF/RC:C | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
SmartDNSpymumu |
|
References
- VDB-342841 | pymumu SmartDNS SVBC Record dns.c _dns_decode_SVCB_HTTPS stack-based overflowvdb-entrytechnical-description
- VDB-342841 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- Submit #736827 | pymumu smartdns 47.1 Stack-based Buffer Overflowthird-party-advisory
- https://github.com/pymumu/smartdns/commit/2d57c4b4e1add9b4537aeb403f794a084727e1c8patch
- https://github.com/pymumu/smartdns/product
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