CVE-2026-27143

CRITICAL 9.8

Missing bound checks can lead to memory corruption in safe Go in cmd/compile

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

1th

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.

Vendor	go toolchain
Product	cmd/compile
Published	Apr 8, 2026
Last Updated	Apr 13, 2026

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Affected Versions

Go toolchain / cmd/compile

0 < 1.25.9 1.26.0-0 < 1.26.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/cl/763765 go.dev: https://go.dev/issue/78333 groups.google.com: https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-4868

Credits

Jakub Ciolek - https://ciolek.dev/