CVE-2026-39819Medium· 4.4▾ SunlitA flaw was found in the 'go bug' command within the Go programming language tools. This command writes to temporary files with predictable names. A local attacker with access to the system's temporary directory could exploit this by creati…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 24.2 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 26.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 4.4
none → medium
4.4 → —
medium → none
— → 4.4
none → medium
Last analysed / modified upstream
A flaw was found in the 'go bug' command within the Go programming language tools. This command writes to temporary files with predictable names. A local attacker with access to the system's temporary directory could exploit this by creating a symbolic link (symlink) with one of these predictable names. This would cause the 'go bug' command to overwrite the target of the symlink, potentially leading to arbitrary file overwrite.
cmd/go: golang: Go 'go bug' command: Arbitrary file overwrite via symlink attack — rated Moderate by Red Hat. Released 2026-05-07, updated 2026-09-21.
Affected:
Fixed:
No fix planned:
Not affected:
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:49702 For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:22120 For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:22112
Affected packages:
toolchain >= 1.26.0-0, < 1.26.3Patched in:
toolchain 1.26.3Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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