Absmach Magistrala Rules Engine re/golang.go os.ReadFile input validation

Summaryinfo

A vulnerability classified as very critical has been found in Absmach Magistrala. The affected element is the function os.ReadFile of the file re/golang.go of the component Rules Engine. This manipulation causes input validation. This vulnerability is handled as CVE-2026-71235. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Absmach Magistrala (version now known). It has been declared as very critical. Affected by this vulnerability is the function os.ReadFile of the file re/golang.go of the component Rules Engine. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Magistrala's Rules Engine allows authenticated users to create rules with embedded Go or Lua scripts executed server-side when IoT messages arrive. The Go script engine (re/golang.go) runs scripts through the Yaegi interpreter with stdlib.Symbols, exposing the full Go standard library (including os and net/http) with validation limited to a regex blocking goroutines and panic() calls; dangerous functions such as os.ReadFile, os.WriteFile, os.Remove, and os.Environ remain fully accessible. The Lua script engine (re/lua.go) performs no input validation at all and preloads dangerous libraries: db (arbitrary database access), ioutil (file I/O), an HTTP client (SSRF), and filepath (traversal). An authenticated low-privileged user can achieve arbitrary file read/write, environment variable leakage, database access, and SSRF against internal microservices.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-71235 since 08/05/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/05/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Absmach

Name

• Magistrala

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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