How severe is GHSA-pqpw-89w5-82v5?

No CVSS score has been assigned to GHSA-pqpw-89w5-82v5 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-pqpw-89w5-82v5?

GHSA-pqpw-89w5-82v5 affects the following packages: simd-json-derive (crates.io). Ecosystems affected: crates.io.

How do I fix GHSA-pqpw-89w5-82v5?

Update simd-json-derive to 0.12.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-pqpw-89w5-82v5 is resolved across your whole dependency graph.

How do I detect GHSA-pqpw-89w5-82v5 in my crates.io dependencies?

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

How do I mitigate GHSA-pqpw-89w5-82v5 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-pqpw-89w5-82v5 actively exploited in the wild?

No public exploit code has been indexed for GHSA-pqpw-89w5-82v5 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-pqpw-89w5-82v5 published, and has it been updated?

GHSA-pqpw-89w5-82v5 was published on November 12, 2024 and was last updated on October 28, 2025. 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

`simd-json-derive` vulnerable to `MaybeUninit` misuseGHSA-pqpw-89w5-82v5

GHSA-pqpw-89w5-82v5 is a security vulnerability in simd-json-derive. A fix is available for simd-json-derive — see the affected versions and patch details below.

Also known asRUSTSEC-2023-0087

Published

Nov 12, 2024

Updated

Oct 28, 2025

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 28, 2025 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🦀simd-json-derive

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

An invalid use of MaybeUninit::uninit().assume_init() in simd-json-derive's derive macro can cause undefined behavior. The original code used MaybeUninit to avoid initialisation of the struct and then set the fields using ptr::write. The undefined behavior triggered by this misuse of MaybeUninit can lead to invlaid memory access and panics in binaries compiled in release mode (aka simd-json-derive prior to version 0.12 has UB and optimizes into some nonsense)

The version 0.12.0 removes this section of code, avoiding the use of MaybeUninit alltogether.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`simd-json-derive`	all versions	0.12.0`cargo update -p simd-json-derive --precise 0.12.0`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for simd-json-derive, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update simd-json-derive to 0.12.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-pqpw-89w5-82v5 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

An invalid use of `MaybeUninit::uninit().assume_init()` in `simd-json-derive`'s derive macro can cause undefined behavior. The original code used `MaybeUninit` to avoid initialisation of the struct and then set the fields using `ptr::write`. The undefined behavior triggered by this misuse of `MaybeUninit` can lead to invlaid memory access and panics in binaries compiled in release mode (aka simd-json-derive prior to version 0.12 has UB and optimizes into some nonsense) The version `0.12.0` removes this section of code, avoiding the use of MaybeUninit alltogether.

O3 Security · Impact-Aware SCA

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