CVE-2026-1425Network attack vectorHinoki check available

Stack overwrite via unchecked DNS record lengths

Published Jan 26, 2026 · Updated Jan 26, 2026

Stack-based buffer overflow in pymumu SmartDNS 47.0 and 47.1 allows remote attackers to corrupt memory via a crafted DNS response. The _dns_decode_rr_head and _dns_decode_SVCB_HTTPS functions trust DNS record lengths without checking them against the bytes remaining in src/dns.c's input buffer. The attacker must influence an upstream SVCB or HTTPS response processed during resolution; successful parsing overwrites stack memory in the DNS service.

CVSS severity6.3
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stack-based buffer overflow in pymumu SmartDNS 47.0 and 47.1 allows remote attackers to corrupt memory via a crafted DNS response. The _dns_decode_rr_head and _dns_decode_SVCB_HTTPS functions trust DNS record lengths without checking them against the bytes remaining in src/dns.c's input buffer. The attacker must influence an upstream SVCB or HTTPS response processed during resolution; successful parsing overwrites stack memory in the DNS service.

The record

CVE
CVE-2026-1425
Published
Jan 26, 2026
Updated
Jan 26, 2026
Vendor
pymumu
Product
SmartDNS
Classifications
CWE-119, CWE-121, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=47.0
  2. Affected versionversion=47.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

pymumu · SmartDNSversion=47.0; version=47.1

Published CVSS scores

6.3VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
5.6VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
5.1VulDBAV:N/AC:H/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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