How severe is GHSA-wfg4-322g-9vqv?

No CVSS score has been assigned to GHSA-wfg4-322g-9vqv yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-wfg4-322g-9vqv?

GHSA-wfg4-322g-9vqv affects the following packages: memoffset (crates.io). Ecosystems affected: crates.io.

How do I fix GHSA-wfg4-322g-9vqv?

Update memoffset to 0.6.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wfg4-322g-9vqv is resolved across your whole dependency graph.

How do I detect GHSA-wfg4-322g-9vqv in my crates.io dependencies?

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

How do I mitigate GHSA-wfg4-322g-9vqv 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-wfg4-322g-9vqv actively exploited in the wild?

No public exploit code has been indexed for GHSA-wfg4-322g-9vqv 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-wfg4-322g-9vqv published, and has it been updated?

GHSA-wfg4-322g-9vqv was published on June 21, 2023 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

memoffset allows reading uninitialized memoryGHSA-wfg4-322g-9vqv

Fix: Gilnaa/memoffset#50

GHSA-wfg4-322g-9vqv is a security vulnerability in memoffset. A fix is available for memoffset — see the affected versions and patch details below.

Also known asRUSTSEC-2023-0045

Published

Jun 21, 2023

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

🦀memoffset

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

memoffset allows attempt of reading data from address 0 with arbitrary type. This behavior is an undefined behavior because address 0 to std::mem::size_of<T> may not have valid bit-pattern with T. Old implementation dereferences uninitialized memory obtained from std::mem::align_of. Older implementation prior to it allows using uninitialized data obtained from std::mem::uninitialized with arbitrary type then compute offset by taking the address of field-projection. This may also result in an undefined behavior for "father" that includes (directly or transitively) type that does not allow to be uninitialized.

This flaw was corrected by using std::ptr::addr_of in https://github.com/Gilnaa/memoffset/pull/50.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`memoffset`	all versions	0.6.2`cargo update -p memoffset --precise 0.6.2`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for memoffset, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update memoffset to 0.6.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wfg4-322g-9vqv 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

memoffset allows attempt of reading data from address `0` with arbitrary type. This behavior is an undefined behavior because address `0` to `std::mem::size_of<T>` may not have valid bit-pattern with `T`. Old implementation dereferences uninitialized memory obtained from `std::mem::align_of`. Older implementation prior to it allows using uninitialized data obtained from `std::mem::uninitialized` with arbitrary type then compute offset by taking the address of field-projection. This may also result in an undefined behavior for "father" that includes (directly or transitively) type that [does no

O3 Security · Impact-Aware SCA

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