// For flags

CVE-2026-39819

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

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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.

*Credits: Harshit Gupta (Mr HAX)
CVSS Scores
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2026-04-07 CVE Reserved
  • 2026-05-07 CVE Published
  • 2026-05-13 CVE Updated
  • 2026-05-14 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-59: Improper Link Resolution Before File Access ('Link Following')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Golang
Search vendor "Golang"
 Go
Search vendor "Golang" for product "Go"
 < 1.25.10
Search vendor "Golang" for product "Go" and version " < 1.25.10"
-
Affected
Golang
Search vendor "Golang"
 Go
Search vendor "Golang" for product "Go"
 >= 1.26.0 < 1.26.3
Search vendor "Golang" for product "Go" and version " >= 1.26.0 < 1.26.3"
-
Affected