How severe is CVE-2026-45136?

CVE-2026-45136 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-45136 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-45136?

CVE-2026-45136 affects Cnighswonger Claude-code-cache-fix. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-45136?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-45136 have an EU (EUVD) identifier?

Yes. CVE-2026-45136 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32664.

When was CVE-2026-45136 published?

CVE-2026-45136 was published on 2026-05-27 and last updated on 2026-06-17.

CVE-2026-45136

CVE-2026-45136 is a high-severity vulnerability in Cnighswonger Claude-code-cache-fix with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 8.6
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-32664
Weakness: CWE-78
Affected product: Cnighswonger Claude-code-cache-fix
Published: 2026-05-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-45136?: 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.
How severe is CVE-2026-45136?: CVE-2026-45136 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-45136 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-45136?: CVE-2026-45136 affects Cnighswonger Claude-code-cache-fix. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-45136?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-45136 have an EU (EUVD) identifier?: Yes. CVE-2026-45136 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32664.
When was CVE-2026-45136 published?: CVE-2026-45136 was published on 2026-05-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cnighswonger:claude-code-cache-fix:*:*:*:*:*:*:*:*

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