AZL-113450: CVE-2026-97033 affecting package golang 1.26.11-1
Building a malicious package that uses cgo could cause arbitrary code execution at build time through several compiler and linker flags permitted in "#cgo" directives. Specifically, "--sysroot" in GCC and Clang relocates compiler subprograms, spec files, and CRT startup objects to an attacker-controlled directory; "-target" in Clang falls back to executing target helper tools from the current working directory when not found in PATH; "-isysroot" and "-Wl,-syslibroot" can pass a regular file on disk to GNU ld.bfd, which interprets it as a positional linker script; and "-x" permitted specifying arbitrary compiler input languages beyond those supported by cgo. "--sysroot" and "-target" are now disallowed in "#cgo" flags, "-isysroot" and "-Wl,-syslibroot" are verified not to point to regular files, and "-x" is restricted to the C, C++, Objective-C, and assembler languages supported by cgo.
Affected Software
Event History
Frequently Asked Questions
Who is exposed to this issue?
Build environments that compile untrusted or malicious Go packages using cgo are exposed. The described impact occurs during the build process, so systems that only run already-built binaries are not identified as affected by the provided information.
What does an attacker need to exploit it?
An attacker needs to cause a malicious package containing cgo directives to be built. The package can use permitted #cgo compiler or linker flags to trigger code execution during compilation or linking.
Are the risky cgo flags still permitted?
The remediation disallows --sysroot and -target in #cgo flags. It also validates that -isysroot and -Wl,-syslibroot do not reference regular files, and limits -x to C, C++, Objective-C, and assembler languages supported by cgo.
What should be done if patching cannot happen immediately?
Do not build untrusted packages that use cgo in the affected environment. Treat build workers compiling third-party source as potentially exposed until the described cgo flag restrictions are in place.