CVE-2026-27143
CVE-2026-27143 is a critical-severity vulnerability in Golang Go with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- EPSS exploit prediction: 1% (41st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-20004
- Affected product: Golang Go
- Published:
- Last modified:
Description
Arithmetic over induction variables in loops were not correctly checked for underflow or overflow. As a result, the compiler would allow for invalid indexing to occur at runtime, potentially leading to memory corruption.
Frequently asked questions
- What is CVE-2026-27143?
- Arithmetic over induction variables in loops were not correctly checked for underflow or overflow. As a result, the compiler would allow for invalid indexing to occur at runtime, potentially leading to memory corruption.
- How severe is CVE-2026-27143?
- CVE-2026-27143 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-27143 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-27143?
- CVE-2026-27143 affects Golang Go. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-27143?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2026-27143 have an EU (EUVD) identifier?
- Yes. CVE-2026-27143 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20004.
- When was CVE-2026-27143 published?
- CVE-2026-27143 was published on 2026-04-08 and last updated on 2026-06-17.
References
- https://go.dev/cl/763765
- https://go.dev/issue/78333
- https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU
- https://pkg.go.dev/vuln/GO-2026-4868
Affected products (1)
- cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
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