Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go

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Summary

CVECVE-2026-39819
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-07 20:16:43 UTC
Updated2026-05-08 22:16:29 UTC
DescriptionThe "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp"). An attacker with access to the temporary directory can create a symlink in one of these names, causing "go bug" to overwrite the target of the symlink.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from ADP

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

EPSS: 0.000060000 probability, percentile 0.003560000 (date 2026-05-12)

Problem Types: CWE-377: Insecure Temporary File

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED5.3MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.3MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Toolchain Cmd/go affected 1.25.10 semver Not specified
CNA Go Toolchain Cmd/go affected 1.26.0-0 1.26.3 semver Not specified

References

ReferenceSourceLinkTags
pkg.go.dev/vuln/GO-2026-4978 [email protected] pkg.go.dev
go.dev/issue/78584 [email protected] go.dev
go.dev/cl/763882 [email protected] go.dev
groups.google.com/g/golang-announce/c/qcCIEXso47M [email protected] groups.google.com
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: Harshit Gupta (Mr HAX) (en)

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