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CRITICAL severity

The `total_size` function for partial read the length of any `FixVec` is incorrect in moleculeGHSA-6p3c-v8vc-c244

CRITICALFix: nervosnetwork/molecule#49

GHSA-6p3c-v8vc-c244 is a critical-severity (CVSS 9.8) vulnerability in molecule. A fix is available for molecule — see the affected versions and patch details below.

Also known asCVE-2021-45697GHSA-82hm-vh7g-hrh9RUSTSEC-2021-0103
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs70th percentile — riskier than 70% of all scored CVEsHighest risk
0.00%0.61%1.21%1.82%0.4%1.3%Apr 26Aug 26Oct 26

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

How urgent is this, really

GHSA-6p3c-v8vc-c244 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 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
🦀molecule

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

Anyone who uses total_size(..) function to partial read the length of any FixVec will get an incorrect result, due to an incorrect implementation. This has been resolved in the 0.7.2 release.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iomoleculeall versions0.7.2cargo update -p molecule --precise 0.7.2

Affected Products

1 product · 1 configurations
Application
moleculenervos
< 0.7.2
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 molecule, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update molecule to 0.7.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-6p3c-v8vc-c244 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

Anyone who uses total_size(..) function to partial read the length of any FixVec will get an incorrect result, due to an incorrect implementation. This has been resolved in the 0.7.2 release.
O3 Security · Impact-Aware SCA

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The `total_size` function for partial read the length of any…