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

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Summary

CVECVE-2026-27143
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-08 02:16:03 UTC
Updated2026-04-16 19:20:02 UTC
DescriptionArithmetic 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

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

EPSS: 0.000240000 probability, percentile 0.066180000 (date 2026-04-15)

Problem Types: NVD-CWE-Other | CWE-190: Integer Overflow or Wraparound

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1ADPDECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Golang Go All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Toolchain Cmd/compile affected 1.25.9 semver Not specified
CNA Go Toolchain Cmd/compile affected 1.26.0-0 1.26.2 semver Not specified

References

ReferenceSourceLinkTags
go.dev/issue/78333 [email protected] go.dev Issue Tracking
pkg.go.dev/vuln/GO-2026-4868 [email protected] pkg.go.dev Vendor Advisory
go.dev/cl/763765 [email protected] go.dev Patch
groups.google.com/g/golang-announce/c/0uYbvbPZRWU [email protected] groups.google.com Release Notes, Mailing List
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Jakub Ciolek - https://ciolek.dev/ (en)

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