CVE-2026-18140 Vulnerability Analysis & Exploit Details

CVE-2026-18140
Vulnerability Scoring

7.5
/10
Very High Risk

Highly exploitable, CVE-2026-18140 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-18140 Details

Status: Analyzed

Last updated: 🕗 10 Aug 2026, 20:04 UTC
Originally published on: 🕖 30 Jul 2026, 19:17 UTC

Time between publication and last update: 11 days

CVSS Release: version 3

CVSS3 Source

ff89ba41-3aa1-4d27-914a-91399e9639e5

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVE-2026-18140 Vulnerability Summary

CVE-2026-18140: Uncontrolled recursion in the unknown-key skip path of the aws-smithy-json runtime crate before 0.62.7, which the smithy-rs code generator invokes from every generated struct deserializer, might allow remote unauthenticated users to cause a denial of service (process abort via stack exhaustion) via a single small HTTP request containing deeply nested JSON to a smithy-rs generated server. To remediate this issue, users should upgrade to aws-smithy-json 0.62.7 or later and rebuild.

Assessing the Risk of CVE-2026-18140

Access Complexity Graph

The exploitability of CVE-2026-18140 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-18140

With low attack complexity and no required privileges, CVE-2026-18140 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-18140, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-18140, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2026-18140 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2026-18140 poses no threat to data integrity.
  • Availability: High
    CVE-2026-18140 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-18140 References

External References

CWE Common Weakness Enumeration

CWE-674

CAPEC Common Attack Pattern Enumeration and Classification

  • Serialized Data with Nested Payloads CAPEC-230 Applications often need to transform data in and out of a data format (e.g., XML and YAML) by using a parser. It may be possible for an adversary to inject data that may have an adverse effect on the parser when it is being processed. Many data format languages allow the definition of macro-like structures that can be used to simplify the creation of complex structures. By nesting these structures, causing the data to be repeatedly substituted, an adversary can cause the parser to consume more resources while processing, causing excessive memory consumption and CPU utilization.
  • Oversized Serialized Data Payloads CAPEC-231 An adversary injects oversized serialized data payloads into a parser during data processing to produce adverse effects upon the parser such as exhausting system resources and arbitrary code execution.

Vulnerable Configurations

  • cpe:2.3:a:amazon:aws-smithy-json:0.27.0:alpha:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.27.0:alpha:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.27.0:alpha1:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.27.0:alpha1:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.27.0:alpha2:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.27.0:alpha2:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.28.0:alpha:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.28.0:alpha:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.30.0:alpha:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.30.0:alpha:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.31.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.31.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.32.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.32.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.33.1:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.33.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.34.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.34.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.34.1:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.34.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.35.1:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.35.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.35.2:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.35.2:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.36.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.36.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.37.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.37.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.38.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.38.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.39.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.39.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.40.2:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.40.2:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.41.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.41.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.42.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.42.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.43.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.43.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.44.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.44.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.45.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.45.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.46.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.46.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.47.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.47.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.48.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.48.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.49.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.49.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.50.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.50.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.51.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.51.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.52.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.52.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.53.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.53.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.53.1:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.53.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.54.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.54.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.54.1:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.54.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.54.2:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.54.2:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.54.3:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.54.3:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.54.4:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.54.4:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.55.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.55.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.55.1:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.55.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.55.2:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.55.2:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.55.3:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.55.3:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.56.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.56.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.56.1:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.56.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.57.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.57.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.57.1:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.57.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.57.2:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.57.2:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.58.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.58.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.59.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.59.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.60.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.60.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.60.1:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.60.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.60.2:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.60.2:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.60.3:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.60.3:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.60.4:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.60.4:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.60.5:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.60.5:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.60.6:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.60.6:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.60.7:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.60.7:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.61.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.61.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.61.1:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.61.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.61.2:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.61.2:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.61.3:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.61.3:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.61.4:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.61.4:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.61.5:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.61.5:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.61.6:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.61.6:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.61.7:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.61.7:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.61.8:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.61.8:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.61.9:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.61.9:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.62.0:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.62.0:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.62.1:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.62.1:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.62.2:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.62.2:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.62.3:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.62.3:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.62.4:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.62.4:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.62.5:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.62.5:*:*:*:*:rust:*:*
  • cpe:2.3:a:amazon:aws-smithy-json:0.62.6:*:*:*:*:rust:*:*
    cpe:2.3:a:amazon:aws-smithy-json:0.62.6:*:*:*:*:rust:*:*

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