CVE-2026-45136: claude-code-cache-fix: Local code execution via Python triple-quote injection in tools/quota-statusline.sh

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-27 · updated 2026-06-17
Weakness: CWE-78

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.

Affected products

cnighswonger claude-code-cache-fix: from 3.5.0 before 3.5.2 — fixed in 3.5.2

How to fix

Upgrade to a fixed version: cnighswonger claude-code-cache-fix 3.5.2. Check the vendor advisory for mitigations.

References

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