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cell-project used incorrect variance when projecting through &Cell

GHSA-p75v-367r-2v23

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (cell-project 0.1.4), 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
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Overview The issue lies in the implementation of the cellproject macro which used field as const instead of field as mut . The problem being that const T is covariant in T while mut T is invariant in T. Keep in mind that &Cell<T is invariant in T, so casting to const T relaxed the variance, and lead to unsoundness, as shown in the example below. MIRI error Affected Versions All versions of the cell-project crate before 0.1.4 are affected. Mitigation This was fixed in [Issues/4], and released as version 0.1.4. So just updating to the latest version will include the fix (which may result in a compile error on unsound usage). Acknowledgements This was discovered and fixed by @SoniEx2 in cell-project: [Issues/3] and [Issues/4] [issues/3]: https://github.com/RustyYato/cell-project/issues/3 [issues/4]: https://github.com/RustyYato/cell-project/issues/4

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

    Published from ghsa record GHSA-p75v-367r-2v23

Agent brief

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# Patch Next advisory brief: GHSA-p75v-367r-2v23

Advisory: `cell-project` used incorrect variance when projecting through `&Cell `
IDs: GHSA-p75v-367r-2v23
Record: https://patchnext.com/advisories/ghsa-p75v-367r-2v23 (revision 1, source checked 26 Oct 2026, 15:33 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 fix available; fixed versions by package: cell-project 0.1.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io cell-project: affected < 0.1.4; fixed in 0.1.4

## Suggested inspection (read-only)
- crates.io cell-project: check the installed version with your package manager.

## 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 cell-project.
- 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://github.com/advisories/GHSA-p75v-367r-2v23 (GitHub-reviewed advisory GHSA-p75v-367r-2v23 lists affected ranges: crates.io cell-project >=0 <0.1.4)

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