Unsafe Dependency Resolution Affecting @anthropic-ai/claude-code package, versions <2.1.179
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-ANTHROPICAICLAUDECODE-21201048
- published18 Oct 2026
- disclosed15 Oct 2026
- creditOr Nevo Michrowski
Introduced: 15 Oct 2026
NewCVE-2026-86063 (opens in a new tab)How to fix?
Upgrade @anthropic-ai/claude-code to version 2.1.179 or higher.
Overview
@anthropic-ai/claude-code is an Use Claude, Anthropic's AI assistant, right from your terminal. Claude can understand your codebase, edit files, run terminal commands, and handle entire workflows for you.
Affected versions of this package are vulnerable to Unsafe Dependency Resolution via the plugin install flow, which uses git checkout with a marketplace-pinned commit SHA without verifying that the resulting HEAD matches the pinned SHA. An attacker who controls a plugin's upstream repository can create a branch named identically to the pinned 40-character SHA, causing the checkout to silently resolve to the attacker's branch tip instead of the reviewed commit, resulting in attacker-controlled code being installed while bypassing the pinned hash check.
Note: This is only exploitable if a user installs a plugin pinned to a specific hash and the plugin source is hosted on a git host that permits SHA-shaped branch names.