Go toolchain cmd/go 1.25.10, 1.26.3: temp file overwrite
CVE-2026-39819 Published on May 7, 2026
Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go
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.
Products Associated with CVE-2026-39819
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Affected Versions
Go toolchain cmd/go:- Before 1.25.10 is affected.
- Version 1.26.0-0 and below 1.26.3 is affected.