How severe is GHSA-4v52-7q2x-v4xj?

GHSA-4v52-7q2x-v4xj has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by GHSA-4v52-7q2x-v4xj?

GHSA-4v52-7q2x-v4xj affects the following packages: eyre (crates.io). Ecosystems affected: crates.io.

How do I fix GHSA-4v52-7q2x-v4xj?

Update eyre to 0.6.12 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4v52-7q2x-v4xj is resolved across your whole dependency graph.

How do I detect GHSA-4v52-7q2x-v4xj in my crates.io dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for eyre. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate GHSA-4v52-7q2x-v4xj 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.

How does O3 Security protect against GHSA-4v52-7q2x-v4xj?

O3 pinpoints whether GHSA-4v52-7q2x-v4xj is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is GHSA-4v52-7q2x-v4xj actively exploited in the wild?

No public exploit code has been indexed for GHSA-4v52-7q2x-v4xj 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-4v52-7q2x-v4xj published, and has it been updated?

GHSA-4v52-7q2x-v4xj was published on April 5, 2024 and was last updated on February 4, 2026. 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

GHSA-4v52-7q2x-v4xj

HIGH

eyre: Parts of Report are dropped as the wrong type during downcast

Also known asRUSTSEC-2024-0021

Published

Apr 5, 2024

Updated

Feb 4, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Blast Radius

1 pkg affected

🦀eyre

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

In affected versions, after a Report is constructed using wrap_err or wrap_err_with to attach a message of type D onto an error of type E, then using downcast to recover ownership of either the value of type D or the value of type E, one of two things can go wrong:

If downcasting to E, there remains a value of type D to be dropped. It is incorrectly "dropped" by running E's drop behavior, rather than D's. For example if D is &str and E is std::io::Error, there would be a call of std::io::Error::drop in which the reference received by the Drop impl does not refer to a valid value of type std::io::Error, but instead to &str.
If downcasting to D, there remains a value of type E to be dropped. When D and E do not happen to be the same size, E's drop behavior is incorrectly executed in the wrong location. The reference received by the Drop impl may point left or right of the real E value that is meant to be getting dropped.

In both cases, when the Report contains an error E that has nontrivial drop behavior, the most likely outcome is memory corruption.

When the Report contains an error E that has trivial drop behavior (for example a Utf8Error) but where D has nontrivial drop behavior (such as String), the most likely outcome is that downcasting to E would leak D.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`eyre`	≥ 0.6.9&&< 0.6.12	0.6.12

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for eyre. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update eyre to 0.6.12 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4v52-7q2x-v4xj 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.
How O3 protects you
O3 pinpoints whether GHSA-4v52-7q2x-v4xj is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-4v52-7q2x-v4xj. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

In affected versions, after a `Report` is constructed using `wrap_err` or `wrap_err_with` to attach a message of type `D` onto an error of type `E`, then using `downcast` to recover ownership of either the value of type `D` or the value of type `E`, one of two things can go wrong: - If downcasting to `E`, there remains a value of type `D` to be dropped. It is incorrectly "dropped" by running `E`'s drop behavior, rather than `D`'s. For example if `D` is `&str` and `E` is `std::io::Error`, there would be a call of `std::io::Error::drop` in which the reference received by the `Drop` impl does no

O3 Security · Impact-Aware SCA

Is GHSA-4v52-7q2x-v4xj in your dependencies?

O3 detects GHSA-4v52-7q2x-v4xj across crates.io dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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