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Vulnerability record · CVE-2026-45136 · published 27 May 2026

CVE-2026-45136: Cnighswonger claude-code-cache-fix os command injection vulnerability

CCnighswonger · Claude Code Cache Fix

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.

8.6 CVSS 4.0 High EPSS 0.21% · top 89.4% CWE-78 · OS command injectionCWE-94 · Code injection
8.6CVSS 4.0 base score
0.21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/cnighswonger/claude-code-cache-fix/issues/108 ExploitIssue Tracking
https://github.com/cnighswonger/claude-code-cache-fix/pull/110 Issue TrackingPatch
https://github.com/cnighswonger/claude-code-cache-fix/security/advisories/GHSA-g3xq-3gmv-qq8g MitigationVendor Advisory
https://github.com/cnighswonger/claude-code-cache-fix/issues/108 ExploitIssue Tracking
https://github.com/cnighswonger/claude-code-cache-fix/security/advisories/GHSA-g3xq-3gmv-qq8g MitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-45136), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.