CVE-2026-39836

Panic in Dial and LookupPort when handling NUL byte on Windows in net

State: Published
Severity: 7.5 High
Published: May 7, 2026
Updated: May 8, 2026
Reserved: Apr 7, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
netGo standard library	before 1.25.10Affected 1.26.0-0 to before 1.26.3Affected

References

https://go.dev/issue/79006
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
https://go.dev/cl/775320
https://pkg.go.dev/vuln/GO-2026-4971

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