Is CVE-2026-42503 actively exploited?

No active exploitation of CVE-2026-42503 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42503 be exploited remotely?

Partially. CVE-2026-42503 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2026-42503?

CVE-2026-42503 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2026-42503

CWE-1327Published: May 6, 2026· Updated: May 7, 2026

8.8

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:4.5th

Official Description

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 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.

NVD Source

Technical Analysis

CVE-2026-42503 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.