Vulnerability · Published Apr 8, 2026 · Assigned by Go
CVE-2026-27143Missing bound checks can lead to memory corruption in safe Go in cmd/compile
Critical 9.8
In plain English
A critical-severity security flaw in cmd/compile from Go toolchain. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.5%top 54.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | delve | 1.25.2-1.module_el8.10.0+4074+24330916 | ALSA-2026:10704 |
| AlmaLinux:8 | go-toolset | 1.25.9-1.module_el8.10.0+4167+2e2e20dd | ALSA-2026:10704 |
| AlmaLinux:8 | golang | 1.25.9-1.module_el8.10.0+4167+2e2e20dd | ALSA-2026:10704 |
| AlmaLinux:8 | golang-bin | 1.25.9-1.module_el8.10.0+4167+2e2e20dd | ALSA-2026:10704 |
| AlmaLinux:8 | golang-docs | 1.25.9-1.module_el8.10.0+4167+2e2e20dd | ALSA-2026:10704 |
| AlmaLinux:8 | golang-misc | 1.25.9-1.module_el8.10.0+4167+2e2e20dd | ALSA-2026:10704 |
| AlmaLinux:8 | golang-race | 1.25.9-1.module_el8.10.0+4167+2e2e20dd | ALSA-2026:10704 |
| AlmaLinux:8 | golang-src | 1.25.9-1.module_el8.10.0+4167+2e2e20dd | ALSA-2026:10704 |
| AlmaLinux:8 | golang-tests | 1.25.9-1.module_el8.10.0+4167+2e2e20dd | ALSA-2026:10704 |
| Alpine:v3.23 | go | 1.25.9-r0 | ALPINE-CVE-2026-27143 |
| Alpine:v3.24 | go | 1.26.2-r0 | ALPINE-CVE-2026-27143 |
| Alpine:v3.24 | rclone | 1.73.5-r0 | ALPINE-CVE-2026-27143 |
| Debian:13 | golang-1.24 | no fix listed | DEBIAN-CVE-2026-27143 |
| Debian:14 | golang-1.26 | 1.26.2-1 | DEBIAN-CVE-2026-27143 |
| Go | toolchain | 1.25.9, 1.26.2 | GO-2026-4868 |
| Rocky Linux:8 | delve | 0:1.25.2-1.module+el8.10.0+40035+ee0a7047 | RLSA-2026:10704 |
| Rocky Linux:10 | golang | 0:1.25.9-3.el10_1 | RLSA-2026:10217 |
| Rocky Linux:8 | golang | 0:1.25.9-1.module+el8.10.0+40168+6cb0ea60 | RLSA-2026:10704 |
| Rocky Linux:9 | golang | 0:1.25.9-1.el9_7 | RLSA-2026:10219 |
| Ubuntu:22.04:LTS | golang-1.20 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:22.04:LTS | golang-1.21 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:24.04:LTS | golang-1.21 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:22.04:LTS | golang-1.22 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:24.04:LTS | golang-1.22 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:22.04:LTS | golang-1.23 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:24.04:LTS | golang-1.23 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:25.10 | golang-1.23 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:26.04:LTS | golang-1.23 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:22.04:LTS | golang-1.24 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:24.04:LTS | golang-1.24 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:25.10 | golang-1.24 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:26.04:LTS | golang-1.24 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:22.04:LTS | golang-1.25 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:24.04:LTS | golang-1.25 | no fix listed | UBUNTU-CVE-2026-27143 |
| Ubuntu:25.10 | golang-1.25 | no fix listed | UBUNTU-CVE-2026-27143 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Go toolchain | cmd/compile | 0 – before 1.25.91.26.0-0 – before 1.26.2 |