CVE-2026-45136: claude-code-cache-fix is a cache optimization proxy for Claude Code

Routine

HIGH 7.8UPGRADE

CVE-2026-45136 is a high-severity flaw (CVSS 7.8) affecting claude-code-cache-fix. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-78, CWE-94
Published	2026-05-27
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: cnighswonger

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-27 21:16 UTCPublished CVE record published
2026-06-17 10:51 UTCUpdated Record last modified

cnighswonger claude-code-cache-fix UPGRADE

Affected: >= 3.5.0 and < 3.5.2

Fixed in: 3.5.2

Safe to downgrade to: a release before 3.5.0

1. Check installed version

apt-cache policy claude-code-cache-fix || rpm -q claude-code-cache-fix || claude-code-cache-fix --version

2. UPGRADE to 3.5.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade claude-code-cache-fix

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade claude-code-cache-fix

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.5.0 (Debian / Ubuntu)

apt-cache madison claude-code-cache-fix sudo apt install claude-code-cache-fix=<VERSION_BEFORE_3.5.0> sudo apt-mark hold claude-code-cache-fix

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list claude-code-cache-fix sudo dnf downgrade claude-code-cache-fix-<VERSION_BEFORE_3.5.0> sudo dnf versionlock add claude-code-cache-fix

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-45136?

claude-code-cache-fix: upgrade to 3.5.2. Exact commands for each OS are on this page.

Is CVE-2026-45136 being exploited?

CVE-2026-45136 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-45136 affect?

CVE-2026-45136 affects claude-code-cache-fix. Severity is high (CVSS 7.8). 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 lite

How urgent is CVE-2026-45136?

Priority 34/100. High severity; Public exploit reference

Software pages

Python vulnerabilities

References

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