How severe is GHSA-9c9f-7x9p-4wqp?

No CVSS score has been assigned to GHSA-9c9f-7x9p-4wqp yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-9c9f-7x9p-4wqp?

GHSA-9c9f-7x9p-4wqp affects the following packages: qcell (crates.io). Ecosystems affected: crates.io.

How do I fix GHSA-9c9f-7x9p-4wqp?

Update qcell to 0.4.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9c9f-7x9p-4wqp is resolved across your whole dependency graph.

How do I detect GHSA-9c9f-7x9p-4wqp in my crates.io dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for qcell, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-9c9f-7x9p-4wqp if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is GHSA-9c9f-7x9p-4wqp actively exploited in the wild?

No public exploit code has been indexed for GHSA-9c9f-7x9p-4wqp yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-9c9f-7x9p-4wqp published, and has it been updated?

GHSA-9c9f-7x9p-4wqp was published on June 17, 2022 and was last updated on November 8, 2023. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🦀 crates.io

Not in CISA KEV

A malicious coder can get unsound access to TCell or TLCell memoryGHSA-9c9f-7x9p-4wqp

GHSA-9c9f-7x9p-4wqp is a security vulnerability in qcell. A fix is available for qcell — see the affected versions and patch details below.

Also known asRUSTSEC-2022-0007

Published

Jun 17, 2022

Updated

Nov 8, 2023

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 8, 2023 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🦀qcell

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

This is impossible to do by accident, but by carefully constructing marker types to be covariant, a malicious coder can cheat the singleton check in TCellOwner and TLCellOwner, giving unsound access to cell memory. This could take the form of getting two mutable references to the same memory, or a mutable reference and an immutable reference.

The fix is for the crate to internally force the marker type to be invariant. This blocks the conversion between covariant types which Rust normally allows.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`qcell`	all versions	0.4.3`cargo update -p qcell --precise 0.4.3`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for qcell, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update qcell to 0.4.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-9c9f-7x9p-4wqp is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

This is impossible to do by accident, but by carefully constructing marker types to be covariant, a malicious coder can cheat the singleton check in `TCellOwner` and `TLCellOwner`, giving unsound access to cell memory. This could take the form of getting two mutable references to the same memory, or a mutable reference and an immutable reference. The fix is for the crate to internally force the marker type to be invariant. This blocks the conversion between covariant types which Rust normally allows.

O3 Security · Impact-Aware SCA

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