Home/CVE/The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).
CVE

CVE-2026-39836

The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).

The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).

HIGH · CVSS 7.5 EPSS 0.0002
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-476NULL Pointer Dereference
▤

Affected Products & Versions

2
golang go< 1.25.10
golang go>= 1.26.0 and < 1.26.3
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go stdlib fixed in 1.25.10, 1.26.3
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security@golang.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD07 May 2026 · 08:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

7
suse-csafopenSUSE-SU-2026:20763-1
suse-csafopenSUSE-SU-2026:20762-1
suse-csafSUSE-SU-2026:1861-1
suse-csafSUSE-SU-2026:1862-1
msrcCVE-2026-39836
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://go.dev/cl/775320Patch
https://go.dev/issue/79006Issue Tracking
https://groups.google.com/g/golang-announce/c/qcCIEXso47MIssue TrackingMailing List
https://pkg.go.dev/vuln/GO-2026-4971Vendor Advisory
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