CVE-2026-27143
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductGo
PublishedApr 8, 2026
First seenApr 8, 2026
Weakness typeCWE-190Integer overflow
How to fix
Update
- golang go1.25.9, 1.26.2 or later
- toolchain1.25.9, 1.26.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| golang go | v < 1.25.9, 1.26.0 ≤ v < 1.26.2 | 1.25.9, 1.26.2 |
| toolchainGo | v < 1.25.9, 1.26.0-0 ≤ v < 1.26.2 | 1.25.9, 1.26.2 |
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