Cyber Resilience

CVE-2026-42503

High

Published: 06 May 2026

Published
06 May 2026
Modified
07 May 2026
KEV Added
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Patch
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CVSS Score v3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0022 12.9th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-42503 is a high-severity Binding to an Unrestricted IP Address (CWE-1327) vulnerability in Go (inferred from references). Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 12.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

gopls by default communicates via pipe. However, -port and -listen flags are supported as means of debugging. If -listen is given a value without an explicit host (e.g. :8080), or -port is used, gopls will listen on 0.0.0.0. As a…

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result, users might inadvertently cause gopls to bind 0.0.0.0. This can allow a malicious party on the same network to execute code arbitrarily via gopls.

CWE(s)
CWE-1327

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
Why these techniques?

Vulnerability causes gopls to bind to 0.0.0.0, directly enabling remote attackers on the network to exploit the exposed service for arbitrary code execution (T1190/T1210).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-24015Shared CWE-1327
CVE-2025-61934Shared CWE-1327
CVE-2026-0481Shared CWE-1327
CVE-2026-28395Shared CWE-1327
CVE-2025-3621Shared CWE-1327

Affected Assets

Go
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inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References