CVE-2026-45136
Analyzed Analyzed - Analysis Complete
Code Injection in Claude Code Cache Fix Proxy

Publication date: 2026-05-27

Last updated on: 2026-06-02

Assigner: GitHub, Inc.

Description
claude-code-cache-fix is a cache optimization proxy for Claude Code. From 3.5.0 to before 3.5.2, tools/quota-statusline.sh (introduced in v3.5.0) interpolates Claude Code's hook stdin payload directly into a Python triple-quoted string literal. A ''' byte sequence in any user-controlled field of the payload closes the literal early and lets following bytes execute as Python in the user's Claude Code process. This vulnerability is fixed in 3.5.2.
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Meta Information
Published
2026-05-27
Last Modified
2026-06-02
Generated
2026-06-17
AI Q&A
2026-05-28
EPSS Evaluated
2026-06-15
NVD
CVE-2026-45136
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
cnighswonger claude-code-cache-fix From 3.5.0 (inc) to 3.5.2 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
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.
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
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Executive Summary

The vulnerability exists in claude-code-cache-fix versions from 3.5.0 to before 3.5.2, specifically in the script tools/quota-statusline.sh introduced in version 3.5.0. This script interpolates Claude Code's hook stdin payload directly into a Python triple-quoted string literal. If a user-controlled field in the payload contains a triple single-quote sequence ('''), it prematurely closes the string literal, allowing the subsequent bytes to be executed as Python code within the user's Claude Code process.

This means that an attacker can inject and execute arbitrary Python code by crafting a malicious payload, leading to potential code execution vulnerabilities. The issue was fixed in version 3.5.2.

Impact Analysis

This vulnerability can lead to arbitrary code execution within the user's Claude Code process. An attacker who can control the payload sent to the vulnerable script can execute malicious Python code, potentially compromising the system running claude-code-cache-fix.

The impact includes unauthorized actions, data manipulation, or system compromise depending on the privileges of the affected process.

Mitigation Strategies

The vulnerability is fixed in claude-code-cache-fix version 3.5.2. Immediate mitigation involves upgrading the software from any version between 3.5.0 and before 3.5.2 to version 3.5.2 or later.

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