CVE-2026-27143

CRITICAL

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

Title source: cna

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.

References (4)

Core 4

Core 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

Scores

CVSS v3 9.8

EPSS 0.0002

EPSS Percentile 6.4%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact total

Details

Status published

Products (3)

Go toolchain/cmd/compile < 1.25.9

Go toolchain/cmd/compile 1.26.0-0 - 1.26.2

golang/go < 1.25.9

Published Apr 08, 2026

Tracked Since Apr 08, 2026