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CRITICAL severity

CVE-2020-36432 — alg_ds

CRITICAL

CVE-2020-36432 is a critical-severity (CVSS 9.8) CWE-908 vulnerability in alg_ds. No vendor fix is recorded yet; mitigation options are listed below.

Use of Uninitialized Resource in alg_ds

Also known asRUSTSEC-2020-0033
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs68th percentile — riskier than 68% of all scored CVEsHighest risk
0.00%0.58%1.15%1.73%0.4%1.2%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-36432 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 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
🦀alg_ds

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 alg_ds crate through 2020-08-25 for Rust. Matrix::new() internally calls Matrix::fill_with() which uses *ptr = value pattern to initialize the buffer. This pattern assumes that there is an initialized struct at the address and drops it, which results in dropping of uninitialized struct.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🦀crates.ioalg_dsall versionsNo fix

Affected Products

1 product · 1 configurations
Application
alg dsalg_ds_project
≤ 2020-08-25
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 alg_ds, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    No patched version of alg_ds has shipped for CVE-2020-36432 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    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 alg_ds crate through 2020-08-25 for Rust. `Matrix::new()` internally calls `Matrix::fill_with()` which uses `*ptr = value` pattern to initialize the buffer. This pattern assumes that there is an initialized struct at the address and drops it, which results in dropping of uninitialized struct.
O3 Security · Impact-Aware SCA

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CVE-2020-36432: alg_ds: Use of Uninitialized Resource