CVE-2026-54316: Claude Code is an agentic coding tool

Q: How do I fix CVE-2026-54316?

claude code: upgrade to 2.1.163. Exact commands for each OS are on this page.

Q: Is CVE-2026-54316 being exploited?

CVE-2026-54316 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-54316 affect?

CVE-2026-54316 affects claude code. Severity is critical (CVSS 9.1). Claude Code is an agentic coding tool. From 0.2.54 until 2.1.163, because the hostname huggingface.co was pre-approved as a bare hostname for the WebFetch tool, any path on that domain—including attacker-controlled model repositories—was a

Q: How urgent is CVE-2026-54316?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-54316 is a critical-severity flaw (CVSS 9.1) affecting claude code. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Claude Code is an agentic coding tool. From 0.2.54 until 2.1.163, because the hostname huggingface.co was pre-approved as a bare hostname for the WebFetch tool, any path on that domain—including attacker-controlled model repositories—was auto-approved without a permission prompt or being subject to --allowedTools restrictions. An attacker able to inject untrusted content into a Claude Code context could direct it to issue WebFetch requests again

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-183, CWE-200, CWE-515
Published	2026-06-23
Last modified	2026-10-25

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

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-23 18:18 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

anthropic claude code UPGRADE

Affected: >= 0.2.54 and < 2.1.163

Fixed in: 2.1.163

Safe to downgrade to: a release before 0.2.54

1. Check installed version

npm ls claude-code

2. UPGRADE to 2.1.163

npm install claude-code@">=2.1.163"

3. If no update is available yet, DOWNGRADE to a release before 0.2.54

npm view claude-code versions npm install claude-code@"<0.2.54"

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-2026-54316?

claude code: upgrade to 2.1.163. Exact commands for each OS are on this page.

Is CVE-2026-54316 being exploited?

CVE-2026-54316 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-2026-54316 affect?

CVE-2026-54316 affects claude code. Severity is critical (CVSS 9.1). Claude Code is an agentic coding tool. From 0.2.54 until 2.1.163, because the hostname huggingface.co was pre-approved as a bare hostname for the WebFetch tool, any path on that domain—including attacker-controlled model repositories—was a

How urgent is CVE-2026-54316?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-55607 HIGH 8.8 UPGRADE Claude Code is an agentic coding tool
CVE-2026-46406 MEDIUM 6.1 UPGRADE Claude Code is an agentic coding tool

References

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