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HIGH severity

GHSA-w5cr-frph-hw7f — rkyv

HIGHFix: djkoloski/rkyv@9c65ae9

GHSA-w5cr-frph-hw7f is a high-severity (CVSS 7.5) CWE-909 vulnerability in rkyv. A fix is available for rkyv — see the affected versions and patch details below.

Use of uninitialized buffer in rkyv

Also known asCVE-2021-31919RUSTSEC-2021-0054
Published
Aug 25, 2021
Updated
Nov 8, 2023
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Sep 26, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs64th percentile — riskier than 64% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-w5cr-frph-hw7f by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 379,842 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🦀rkyv

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 issue was discovered in the rkyv crate before 0.6.0 for Rust. When an archive is created via serialization, the archive content may contain uninitialized values of certain parts of a struct.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iorkyvall versions0.6.0cargo update -p rkyv --precise 0.6.0

Affected Products

1 product · 1 configurations
Application
rkyvrkyv_project
< 0.6.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update rkyv to 0.6.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-w5cr-frph-hw7f is resolved across your whole dependency graph.

  3. 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 issue was discovered in the rkyv crate before 0.6.0 for Rust. When an archive is created via serialization, the archive content may contain uninitialized values of certain parts of a struct.
O3 Security · Impact-Aware SCA

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GHSA-w5cr-frph-hw7f: rkyv (High 7.5) | O3 Security