Answer in brief
CVE-2026-39822 records a High severity (CVSS 7.8) vulnerability in Root escape via symlink plus trailing slash in os. The current sources do not mark it as known exploited. The current feed maps Go standard library/os (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Go standard library/os (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Go standard library/osgeneric | >=0 <1.25.12 || >=1.26.0-0 <1.26.5 || >=1.27.0-0 <1.27.0-rc.2 | 1.25.12, 1.26.5, 1.27.0-rc.2 |
Published upstream
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 8, 2026
On Unix systems, opening a file in an os.Root improperly follows symlinks to locations outside of the Root when the final path component of the a path is a symbolic link and the path ends in /. For example, 'root.Open("symlink/")' will open "symlink" even when "symlink" is a symbolic link pointing outside of the root.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-39822 records a High severity (CVSS 7.8) vulnerability in Root escape via symlink plus trailing slash in os. The current sources do not mark it as known exploited. The current feed maps Go standard library/os (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Go standard library/os (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Go standard library/osgeneric | >=0 <1.25.12 || >=1.26.0-0 <1.26.5 || >=1.27.0-0 <1.27.0-rc.2 | 1.25.12, 1.26.5, 1.27.0-rc.2 |
Published upstream
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 8, 2026
On Unix systems, opening a file in an os.Root improperly follows symlinks to locations outside of the Root when the final path component of the a path is a symbolic link and the path ends in /. For example, 'root.Open("symlink/")' will open "symlink" even when "symlink" is a symbolic link pointing outside of the root.
Quoted source text, attributed separately from HOL analysis.