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High, CVSS 8.7amended

@asymmetric-effort/nogginlessdom's Path Traversal in matchFileSnapshot allows arbitrary file write

GHSA-322x-v876-g883

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@asymmetric-effort/nogginlessdom 0.0.22), redeploy, then verify what is actually installed.

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

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N · score source
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary The matchFileSnapshot function in src/assertions/snapshots.ts accepted a filePath parameter with zero validation. When snapshot update mode was active (UPDATESNAPSHOTS=1 or setUpdateMode('all')), an attacker who controls test input could write arbitrary content to any filesystem path the process has write access to, including creating intermediate directories. Affected Code File: src/assertions/snapshots.ts, lines 732-769 The filePath flows from expect(value).toMatchFileSnapshot(filePath) at index.ts:1033-1035 with no sanitization, no check that the path is within an expected directory, and no symlink resolution. Proof of Concept Impact In CI/CD environments where test files may come from untrusted pull requests, this allows writing to any writable filesystem location with directory creation. An attacker could overwrite configuration files, inject code into build artifacts, or modify CI pipeline definitions. Fix Fixed in commit…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-322x-v876-g883

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-322x-v876-g883

Agent brief

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# Patch Next advisory brief: GHSA-322x-v876-g883

Advisory: @asymmetric-effort/nogginlessdom's Path Traversal in matchFileSnapshot allows arbitrary file write
IDs: GHSA-322x-v876-g883
Record: https://patchnext.com/advisories/ghsa-322x-v876-g883 (revision 3, source checked 26 Oct 2026, 12:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @asymmetric-effort/nogginlessdom 0.0.22. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @asymmetric-effort/nogginlessdom: affected <= 0.0.21; fixed in 0.0.22

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

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @asymmetric-effort/nogginlessdom.
- 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/GHSA-322x-v876-g883 (OSV record GHSA-322x-v876-g883 lists affected ranges: npm @asymmetric-effort/nogginlessdom >=0 <0.0.22 (fixed))
- Verified: https://github.com/advisories/GHSA-322x-v876-g883 (GitHub-reviewed advisory GHSA-322x-v876-g883 lists affected ranges: npm @asymmetric-effort/nogginlessdom >=0 <=0.0.21)

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