How severe is CVE-2025-66032?

CVE-2025-66032 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-66032 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66032?

CVE-2025-66032 affects Anthropic Claude Code. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66032?

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

Does CVE-2025-66032 have an EU (EUVD) identifier?

Yes. CVE-2025-66032 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201016.

When was CVE-2025-66032 published?

CVE-2025-66032 was published on 2025-12-03 and last updated on 2026-06-17.

CVE-2025-66032

CVE-2025-66032 is a critical-severity vulnerability in Anthropic Claude Code with a CVSS 3.x base score of 9.8. 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-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 8.7
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201016
Weakness: CWE-77
Affected product: Anthropic Claude Code
Published: 2025-12-03
Last modified: 2026-06-17

Description

Claude Code is an agentic coding tool. Prior to 1.0.93, Due to errors in parsing shell commands related to $IFS and short CLI flags, it was possible to bypass the Claude Code read-only validation and trigger arbitrary code execution. Reliably exploiting this requires the ability to add untrusted content into a Claude Code context window. This vulnerability is fixed in 1.0.93.

Frequently asked questions

What is CVE-2025-66032?: Claude Code is an agentic coding tool. Prior to 1.0.93, Due to errors in parsing shell commands related to $IFS and short CLI flags, it was possible to bypass the Claude Code read-only validation and trigger arbitrary code execution. Reliably exploiting this requires the ability to add untrusted content into a Claude Code context window. This vulnerability is fixed in 1.0.93.
How severe is CVE-2025-66032?: CVE-2025-66032 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-66032 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66032?: CVE-2025-66032 affects Anthropic Claude Code. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66032?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-66032 have an EU (EUVD) identifier?: Yes. CVE-2025-66032 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201016.
When was CVE-2025-66032 published?: CVE-2025-66032 was published on 2025-12-03 and last updated on 2026-06-17.

References

https://github.com/anthropics/claude-code/security/advisories/GHSA-xq4m-mc3c-vvg3

Affected products (1)

cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:*

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