Critical severity · published Apr 8, 2026
CVE-2026-27143
Missing bound checks can lead to memory corruption in safe Go in cmd/compile
9.8
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CM
cmd/compile · Go toolchain
before 1.25.9; 1.26.0-0 before 1.26.2 · source: vendor
GO
GO · Golang
before 1.25.9; 1.26.0 before 1.26.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27143
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-27143
Patch
https://go.dev/cl/763765
Issue Tracking
https://go.dev/issue/78333
Mailing List
https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU
Vendor Advisory
https://pkg.go.dev/vuln/GO-2026-4868
More from cmd/compile
7.1
CVE-2026-27144
Miscompilation allows memory corruption via CONVNOP-wrapped array copy in cmd/compile