CVE-2026-39819

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

MEDIUM 5.3

At a glance

Source: NVD
EPSS: EPSS 0.18 % · percentile 7 (2026-10-28)
State: PUBLISHED
Published: 2026-05-07 19:41 UTC
Updated: 2026-05-08 21:29 UTC
Assigner: Go
NVD status: Analyzed

Description

The "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.

Weaknesses (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 5.3	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N	CISA-ADP
CVSS 3.1	MEDIUM 5.3	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N	NVD · nvd@nist.gov (Primary)
CVSS 3.1	MEDIUM 5.3	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N	NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Advisories

GO-2026-4978 — Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go

European references

ENISA EUVD · EUVD-2026-28422
GCVE · GCVE-0-2026-39819

CERT-FR advisories

CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2026-AVI-1249 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* < 1.25.10
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* ≥ 1.26.0 < 1.26.3

Affected products

Product	Versions
Go toolchain · cmd/go	affected 0 < 1.25.10 ; affected 1.26.0-0 < 1.26.3

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD