Google Go up to 1.26.10/1.27.3 cmd/go/link code injection

Summaryinfo

A vulnerability labeled as critical has been found in Google Go up to 1.26.10/1.27.3. This vulnerability affects unknown code of the component cmd/go/link. Executing a manipulation can lead to code injection. This vulnerability is tracked as CVE-2026-97040. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in Google Go up to 1.26.10/1.27.3. This vulnerability affects an unknown part of the component cmd/go/link. The manipulation with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Building a package containing a crafted ".syso" file could bypass cgo flag validation and inject arbitrary linker flags when linking. When loading ".syso" entries from a package archive, the linker only checked for recognized host object headers (ELF, Mach-O, PE, and XCOFF) before falling through to Go object parsing. A ".syso" file beginning with a "go object" header was parsed as a Go compiler object, allowing untrusted cgo metadata directives (such as "cgo_ldflag" or "cgo_dynamic_linker") embedded in the ".syso" file to be passed to the external linker without validation. Additionally, ".syso" filenames longer than 16 bytes lost their ".syso" extension when truncated in archive headers, and unrecognized ".syso" formats forced external linking in pure-Go builds. The linker now rejects ".syso" files that are not recognized host object formats, and "cmd/go" and "cmd/pack" preserve the ".syso" suffix when truncating long archive member names.

This vulnerability was named CVE-2026-97040 since 09/24/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 11/11/2026). The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 1.26.11 or 1.27.4 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• Google

Name

• Go

Version

• 1.26.0
• 1.26.1
• 1.26.2
• 1.26.3
• 1.26.4
• 1.26.5
• 1.26.6
• 1.26.7
• 1.26.8
• 1.26.9
• 1.26.10
• 1.27.0
• 1.27.1
• 1.27.2
• 1.27.3

License

• open-source

Website

• Vendor: https://www.google.com/

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