RUSTSEC-2026-0204 Invalid pointer dereference in `fmt::Pointer` impl for `Atomic` and `Shared` when the underlying pointer is invalid
Not scored
Published
Check this codebase for RUSTSEC-2026-0204 and fix it if it is affected.
What it is: RUSTSEC-2026-0204 is a vulnerability in crossbeam-epoch, published on 6 Jul 2026.
Exploitation: There is no known exploitation of RUSTSEC-2026-0204 in the wild and no public exploit code.
Affected packages and fixed versions:
- crossbeam-epoch (crates.io): affected from 0.9.0; fixed in 0.9.20
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/RUSTSEC-2026-0204/ (Markdown: https://insights.sbomify.com/RUSTSEC-2026-0204/index.md)
An attacker can cause a denial of service by triggering an invalid pointer dereference in the Display implementation for Atomic and Shared types.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- Available
What is RUSTSEC-2026-0204?
RUSTSEC-2026-0204 is a vulnerability in crossbeam-epoch, published on 6 Jul 2026.
Official description
Affected versions of
fmt::Display dereference the underlying pointer. This causes a invalid pointer dereference e.g., when a pointer created with Atomic::null or Shared::null. fmt::Debug impls and pre-0.9 fmt::Display impls, which do not dereference pointers, are not affected by this issue.Which versions are affected by RUSTSEC-2026-0204?
1 open source package ship an affected version, including crossbeam-epoch.
| Package | Affected | Fixed in |
|---|---|---|
crossbeam-epoch crates.io | From 0.9.0 | 0.9.20 |
How do I fix RUSTSEC-2026-0204?
Upgrade crossbeam-epoch to 0.9.20 or later.
Is RUSTSEC-2026-0204 being exploited?
There is no known exploitation of RUSTSEC-2026-0204 in the wild and no public exploit code.