Home/CVE/The "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp").
CVE

CVE-2026-39819

The "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp").

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.

MEDIUM · CVSS 5.3 EPSS 9e-05
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-59Improper Link Resolution Before File Access ('Link Following')
▤

Affected Products & Versions

2
golang go< 1.25.10
golang go>= 1.26.0 and < 1.26.3
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go toolchain fixed in 1.25.10, 1.26.3
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · security@golang.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD07 May 2026 · 08:16 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

7
suse-csafopenSUSE-SU-2026:20763-1
suse-csafopenSUSE-SU-2026:20762-1
suse-csafSUSE-SU-2026:1861-1
suse-csafSUSE-SU-2026:1862-1
msrcCVE-2026-39819
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://go.dev/cl/763882Patch
https://go.dev/issue/78584Issue Tracking
https://groups.google.com/g/golang-announce/c/qcCIEXso47MIssue TrackingMailing List
https://pkg.go.dev/vuln/GO-2026-4978Vendor Advisory
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