Buffer overflow in Pymumu Smartdns
CVE-2026-1425
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (32.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Pymumu Smartdns — versions 47.0, 47.1
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, vdb-entry)
- vuldb.com/ (signature, permissions-required)
- vuldb.com/ (third-party-advisory)
- github.com/pymumu/smartdns/commit/2d57c4b4e1add9b4537aeb403f794a084727e1c8 (patch)
- github.com/pymumu/smartdns/ (product)
Frequently asked questions
- What is CVE-2026-1425?
- CVE-2026-1425 is a medium-severity vulnerability in Pymumu Smartdns, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.6/10. Published 2026-01-26.
- How severe is CVE-2026-1425?
- Medium severity. CVSS v3 base score is 5.6 out of 10.