CVE-2026-27143

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

State: Published
Severity: 9.8 Critical
Published: Apr 8, 2026
Updated: Apr 13, 2026
Reserved: Feb 17, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
cmd/compileGo toolchain	before 1.25.9Affected 1.26.0-0 to before 1.26.2Affected

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

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