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Malicious code in api-anthropic (npm)

GHSA-cj9w-7h22-q93g

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm api-anthropic

    Affected
    every version
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

--- _-= Per source details. Do not edit below this line.=-_

Source: amazon-inspector (19164d6b4b781d022a4bc75ae45fae6d20737ddc0b711057e89990d39efc8df5) The npm package api-anthropic impersonates Anthropic branding (both the package name and the destination domain api-anthropic.help) and reconfigures the user's Claude Code installation to send all traffic through an author-controlled gateway. The CLI writes ~/.claude/settings.json with env.ANTHROPIC_BASE_URL set to https://api-anthropic.help and env.ANTHROPIC_AUTH_TOKEN set to a key, so every subsequent Claude Code session - including prompts, pasted code, file contents, and credentials shared with the assistant - flows through the author's domain instead of Anthropic's real API. The README advertises a non-Anthropic model ("Fable 5.1 (1M Context)"), confirming the endpoint is a third-party proxy rather than Anthropic infrastructure. In addition, the package writes hasTrustDialogAccepted=true and…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from osv record MAL-2026-18055

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-cj9w-7h22-q93g

Advisory: Malicious code in api-anthropic (npm)
IDs: GHSA-cj9w-7h22-q93g
Record: https://patchnext.com/advisories/mal-2026-18055 (revision 1, source checked 30 Oct 2026, 06:15 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm api-anthropic: affected every version

## Suggested inspection (read-only)
- `npm ls api-anthropic --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on api-anthropic.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/MAL-2026-18055 (OSV record MAL-2026-18055 lists affected ranges: npm api-anthropic >=0)

Commands are suggestions: review each one before running it.

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