CVE-2026-42503
CVE-2026-42503 is a high-severity vulnerability with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1327.
Key facts
- Severity: High (CVSS 3.x base score 8.8)
- EPSS exploit prediction: 0% (13th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-27872
- Weakness: CWE-1327
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-42503?
- 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.
- How severe is CVE-2026-42503?
- CVE-2026-42503 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-42503 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-42503?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-42503 have an EU (EUVD) identifier?
- Yes. CVE-2026-42503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27872.
- When was CVE-2026-42503 published?
- CVE-2026-42503 was published on 2026-05-06 and last updated on 2026-06-17.
References
Other CWE-1327 vulnerabilities
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- CVE-2026-0481 — Critical (CVSS 9.2): Unrestricted IP address binding in the AMD Device Metrics Exporter (ROCm ecosystem) could allow a remote attacker to…
- CVE-2025-55322 — High (CVSS 7.3): Binding to an unrestricted ip address in GitHub allows an unauthorized attacker to execute code over a network.
- CVE-2025-11538 — Medium (CVSS 6.8): A vulnerability exists in Keycloak's server distribution where enabling debug mode (--debug <port>) insecurely defaults…