CVE-2026-39836Network attack vector

Service interruption via NUL-triggered networking panic

Published May 7, 2026 · Updated May 7, 2026

Denial of service in Go net before 1.25.10 and 1.26.0 through 1.26.2 allows remote attackers to crash Windows applications. Dial and LookupPort mishandle NUL-containing address or service strings by panicking instead of returning an input error. Exposure requires a Windows application to pass attacker-controlled input to an affected networking function; the resulting panic can terminate that application and interrupt its service.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Go net before 1.25.10 and 1.26.0 through 1.26.2 allows remote attackers to crash Windows applications. Dial and LookupPort mishandle NUL-containing address or service strings by panicking instead of returning an input error. Exposure requires a Windows application to pass attacker-controlled input to an affected networking function; the resulting panic can terminate that application and interrupt its service.

The record

CVE
CVE-2026-39836
Published
May 7, 2026
Updated
May 7, 2026
Vendor
Go
Product
net
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2026CVE publishedPublication date reported by the CVE source.
  2. May 7, 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=0 <1.25.10
  2. Affected versionversion=1.26.0-0 <1.26.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go · netversion=0 <1.25.10; version=1.26.0-0 <1.26.3

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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