How severe is CVE-2026-45136?

No CVSS score has been assigned to CVE-2026-45136 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-45136?

CVE-2026-45136 affects the following packages: claude-code-cache-fix (npm). Ecosystems affected: npm.

How do I fix CVE-2026-45136?

Update claude-code-cache-fix to 3.5.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-45136 is resolved across your whole dependency graph.

How do I detect CVE-2026-45136 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for claude-code-cache-fix, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-45136 if there is no patch (or I can't update yet)?

Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Is CVE-2026-45136 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-45136 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-45136?

CVE-2026-45136 has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 8th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-45136?

CVE-2026-45136 is classified as OS Command Injection (CWE-78), Code Injection (CWE-94). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2026-45136 published, and has it been updated?

CVE-2026-45136 was published on May 27, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

CVE-2026-45136 — claude-code-cache-fix

Fix: cnighswonger/claude-code-cache-fix#110

CVE-2026-45136 is a OS Command Injection vulnerability in claude-code-cache-fix. A fix is available for claude-code-cache-fix — see the affected versions and patch details below.

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

Also known asGHSA-g3xq-3gmv-qq8g

Published

May 27, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-45136.

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs8th percentile — riskier than 8% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

0other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

claude-code-cache-fixnpm

156downloads / week

Description

Summary

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.

Affected versions

v3.5.0
v3.5.1

Patched versions

v3.5.2

Affected configurations

Users who wired tools/quota-statusline.sh into Claude Code's statusLine configuration. The v3.5.0 README explicitly recommends this setup, so most users on v3.5.0/v3.5.1 with the recommended setup are affected.

Attack chain

Claude Code's statusline hook payload reflects user-controlled paths (cwd, workspace.current_dir, workspace.project_dir, transcript_path). Apostrophes are legal in POSIX filesystem paths.

A hostile directory name containing '''+payload+''' lands on disk via any normal vector — git clone, archive extraction, npm package, downloaded zip, etc.
The victim has the recommended tools/quota-statusline.sh wired into their CC statusLine config.
The victim cds anywhere a hostile path is reachable.
CC fires the statusline hook on every redraw. The Python literal closes early. The injected bytes execute as Python in the user's process.

Severity

Local code execution at user privilege. Persistent re-fire on every statusline redraw. No user interaction beyond cd-ing into the hostile path. The user's shell, CC session, files, SSH keys, and any locally-accessible credentials are reachable from the executed code.

Vulnerable pattern

input=$(cat)
result=$(python3 -c "
    stdin_data = json.loads('''$input''') if '''$input''' else {}
")

Fix

Capture stdin in bash, export to env, and pipe the Python source through a single-quoted heredoc (<<'PYEOF'). Single-quoting disables ALL bash interpolation inside the body. Python reads the JSON via os.environ.get('CC_INPUT'), where the bytes are inert at every layer.

CC_INPUT=$(cat)
export CC_INPUT

python3 <<'PYEOF' 2>/dev/null
import os, json
try:
    cc_input = json.loads(os.environ.get('CC_INPUT') or '{}')
except Exception:
    cc_input = {}
# ...
PYEOF

Workarounds

Until upgrading to v3.5.2:

Disable the statusline by removing the statusLine entry from ~/.claude/settings.json, or
Replace tools/quota-statusline.sh with a script that does NOT pass stdin through python3 -c "..." (a heredoc + env var rewrite is safe)

Credit

Reported by Jakob Linke (@schuay) via GitHub issue #108.

Timeline

2026-05-07 — reported (#108)
2026-05-07 — confirmed, fix implemented (#110)
2026-05-07 — v3.5.2 published

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`claude-code-cache-fix`	≥ 3.5.0&&< 3.5.2	3.5.2`npm install claude-code-cache-fix@3.5.2`

Affected Products

1 product · 1 configurations

Application

claude-code-cache-fixcnighswonger

≥ 3.5.0 && < 3.5.2

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for claude-code-cache-fix, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update claude-code-cache-fix to 3.5.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-45136 is resolved across your whole dependency graph.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

## Summary `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. ## Affected versions - v3.5.0 - v3.5.1 ## Patched versions - v3.5.2 ## Affected configurations Users who wired `tools/quota-statusline.sh` into Claude Code's `statusLine` configuration. The v3.5.0 README explicitly recommends this setup, so most users on v3.5.0/v

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