External risk intelligence

jmespath.rb Improper JSON Parsing Vulnerability.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2022-32511

A critical vulnerability exists in the jmespath.rb library, a Ruby implementation for processing JSON data. The flaw stems from the use of a less secure JSON parsing method, which could allow an attacker to execute arbitrary Ruby code if they can control the JSON input processed by an application using a vulnerable ver

3Halo Surface Signal

Jmespath

before 1.6.13536

External exposure likelihood

Halo Surface Signal score for CVE-2022-32511

The vulnerability exists in a Ruby library (jmespath.rb) used for data processing. While libraries are often used in web applications that may be internet-facing, they are also frequently used in internal tools, command-line utilities, and backend processing scripts where public network exposure is not the default or intended deployment pattern.

PCI scan relevance

PCI Relevance for CVE-2022-32511

Yes

CVE-2022-32511 — Halo PCI Relevance: Yes. Under typical PCI ASV external scan criteria, this issue may be flagged for scan prioritization.

This vulnerability in jmespath.rb allows for arbitrary code execution, which would likely cause a PCI ASV scan to fail.

Scan-prioritization guidance only—not a PCI DSS certification or ASV attestation.

Horizon Alert

Summary of the vulnerability and why it matters

This advisory concerns a critical vulnerability in a Ruby data processing library that allows for insecure handling of certain data inputs, potentially leading to unauthorized access or modification of information. The primary concern is to confirm if this library is used within our environment and, if so, to what extent it may be exposed.

A Ruby library improperly handles data inputs.
Matters if used in applications or systems.
Confirm relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted input to an application that uses the jmespath.rb library. If the application processes this input using a vulnerable function, it could lead to the execution of arbitrary code. This could occur when processing untrusted data, potentially allowing the attacker to take control of the affected system or steal sensitive information.

No authentication or special privileges needed.
Triggered by processing untrusted input.
Allows arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

When the jmespath.rb library improperly handles JSON input by using `JSON.load` instead of `JSON.parse`, it could allow for the execution of arbitrary Ruby code. This could occur if an attacker is able to control the JSON input processed by an application utilizing a vulnerable version of the library.

Ruby code execution.
Processing untrusted JSON input.
Potential for system compromise.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Teams responsible for Ruby application code, libraries, and their runtime environments should address this vulnerability. The first practical step is to identify all instances of the affected library, determine their exposure, and confirm ownership before planning remediation.

Application owners should prioritize this issue.
Verify library usage and exposure.
Plan remediation during maintenance windows.

Frequently asked questions

What is jmespath.rb?

jmespath.rb is a Ruby implementation of JMESPath, a query language used to select and extract data from JSON documents. Developers use this library in their applications to navigate complex data structures easily. Because it is a utility library, it is often bundled as a dependency within larger Ruby applications, backend services, or data processing tools to help manage how those systems parse and query incoming information.

How does CVE-2022-32511 create a security weakness?

This vulnerability involves the improper use of the Ruby `JSON.load` method, which is a known insecure practice when handling untrusted input. Unlike `JSON.parse`, which safely converts strings to data objects, `JSON.load` can trigger the deserialization of Ruby objects. In the context of this CVE, this means the library might inadvertently execute arbitrary code if it encounters malicious JSON data, rather than just reading the data as intended.

What must happen for this vulnerability to be triggered?

An attacker must be able to supply crafted JSON input that is then processed by an application using the vulnerable version of the library. It is important to note that this bug is not triggered by simply installing or having the library present in a project folder. The vulnerability only becomes active if an application actually calls the vulnerable code path while processing untrusted or externally sourced JSON payloads.

Is my system at risk if I use this library?

Risk depends on how and where the library is deployed. According to Halo Surface Signal, while this library is often found in web applications that face the internet, it is also frequently embedded in internal tools or backend scripts. Applications processing external, untrusted data carry higher risk. If your use of jmespath.rb is limited to strictly internal, trusted processing, the practical surface area for an attack is significantly reduced.

Do I need to update my code to fix this?

Yes, if you are using a version of jmespath.rb prior to 1.6.1, you should prioritize an update. The first step is to perform an inventory of your Ruby projects to identify where this library is present. Once identified, verify whether the application processes untrusted user input. If it does, update to the patched version or newer, and verify your dependency tree during your next maintenance cycle to ensure the fix is correctly implemented.

References

Written by Nicholas Merritt

External-surface CVE analysis and Halo Surface Signal prioritization for Halo Threat Intelligence.