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Malicious code in tailwindcss-hook-forms (npm)

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 tailwindcss-hook-forms

    Affected
    >= 0.5.2, <= 0.5.2
    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 (d504fed314f875b17a90d039af71b0798636e5030373e5d959871dc356bc7bef) The package impersonates @tailwindcss/forms: name, repository (tailwindlabs/tailwindcss-forms), author (@tailwindcss), README, CHANGELOG, and HTML are copied from the legitimate plugin, with a demo link to tailwindcss-hook-forms.vercel.app. src/index.js prepends a hand-rolled string-permutation decoder (spin() with magic constants NX/SX, splitLane/peel wrappers) that resolves the Function constructor via peel.constructor and immediately invokes a function compiled from a ~15KB opaque, obfuscated string literal, passing the host require into it. This fires whenever any consumer imports the package, running attacker-controlled code in the installer's Node.js process with full access to require, process, filesystem, and network. The subsequent code replicates the public API of @tailwindcss/forms as cover. The obfuscator scheme does…

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

    Published from osv record MAL-2026-19145

Agent brief

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

# Patch Next advisory brief: mal-2026-19145

Advisory: Malicious code in tailwindcss-hook-forms (npm)
IDs: mal-2026-19145
Record: https://patchnext.com/advisories/mal-2026-19145 (revision 1, source checked 12 Nov 2026, 06:00 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 tailwindcss-hook-forms: affected >= 0.5.2, <= 0.5.2

## Suggested inspection (read-only)
- `npm ls tailwindcss-hook-forms --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 tailwindcss-hook-forms.
- 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-2026-19145 (OSV record MAL-2026-19145 lists affected ranges: npm tailwindcss-hook-forms >=0.5.2 <=0.5.2)

Commands are suggestions: review each one before running it.

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