CVE-2026-39819

CVE-2026-39819 concerns the Go tool (go bug). The vulnerability arises when the command writes to two files with predictable names in the system temporary directory (e.g., /tmp). An attacker with access to the temporary directory can create a symlink in one of these names, causing the go bug proc...

CVE-2026-39817

The CVE-2026-39817 issue concerns the Go tool chain: the go tool pack subcommand (used internally by the compiler) does not sanitize output filenames. This allows an attacker to craft a malicious archive that, when unpacked via pack, can write files to arbitrary locations on the filesystem. Repor...

CVE-2026-39819

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...

CVE-2026-39817

The "go tool pack" subcommand usually used only by the compiler as an internal tool with known-good inputs does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem...

CVE-2026-39817

The "go tool pack" subcommand usually used only by the compiler as an internal tool with known-good inputs does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem...

CVE-2026-39819 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...

CVE-2026-39819

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...

CVE-2026-39825

CVE-2026-39825 concerns Go’s ReverseProxy (net/http/httputil). The issue: ReverseProxy forwards query parameters that are not visible to Rewrite/Director functions parsing parameters via url.ParseQuery. It does not respect ParseQuery’s limit on total query parameters (controlled by GODEBUG=urlmax...

CVE-2026-39817 Invoking "go tool pack" does not sanitize output paths in cmd/go

The "go tool pack" subcommand usually used only by the compiler as an internal tool with known-good inputs does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem...

CVE-2026-39819 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...

CVE-2026-39819 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...

CVE-2026-39817 Invoking "go tool pack" does not sanitize output paths in cmd/go

The "go tool pack" subcommand usually used only by the compiler as an internal tool with known-good inputs does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem...

Information Exposure

Overview std/net/http/httputil is a Go standard library package std/net/http/httputil Affected versions of this package are vulnerable to Information Exposure. Go Vulnerability Report: ReverseProxy can forward queries containing parameters not visible to Rewrite functions. When used with a Rewrit...

Uncaught Exception

Overview std/net is a Go standard library package std/net Affected versions of this package are vulnerable to Uncaught Exception. Go Vulnerability Report: The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL 0. Remediation Upgrade std/net to version...

GO-2026-4979 Invoking "go tool pack" does not sanitize output paths in cmd/go

The "go tool pack" subcommand usually used only by the compiler as an internal tool with known-good inputs does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem...

Cross-site Scripting (XSS)

Overview std/html/template is a Go standard library package std/html/template Affected versions of this package are vulnerable to Cross-site Scripting XSS. Go Vulnerability Report: CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a tag's attribute. If the UR...

Directory Traversal

Overview Affected versions of this package are vulnerable to Directory Traversal. Go Vulnerability Report: The "go tool pack" subcommand usually used only by the compiler as an internal tool with known-good inputs does not sanitize output filenames. Extracting a malicious archive file with the...

GO-2026-4984 Malicious module proxy can bypass checksum database in cmd/go

A malicious module proxy can exploit a flaw in the go command's validation of module checksums to bypass checksum database validation. This vulnerability affects any user using an untrusted module proxy GOMODPROXY or checksum database GOSUMDB. A malicious module proxy can serve altered versions o...

GO-2026-4982 Bypass of meta content URL escaping causes XSS in html/template

CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a tag's attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the attribute, the escaper would fail to similarly escape it, leading to XSS...

Symlink Attack

Overview Affected versions of this package are vulnerable to Symlink Attack. Go Vulnerability Report: 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 o...