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Not in CISA KEV
HIGH severity

CVE-2020-35894 — obstack

HIGH

CVE-2020-35894 is a high-severity (CVSS 7.5) CWE-706 vulnerability in obstack. A fix is available for obstack — see the affected versions and patch details below.

Unaligned references in Obstack

Also known asGHSA-85j6-f8j6-q26xRUSTSEC-2020-0040
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk+0.01%
Lower risk than most CVEs67th percentile — riskier than 67% of all scored CVEsHighest risk
0.00%0.56%1.12%1.67%0.2%0.2%1.2%1.2%1.2%Apr 26Jul 26Oct 26

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

How urgent is this, really

CVE-2020-35894 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
🦀obstack

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 obstack crate before 0.1.4 for Rust. Unaligned references can occur.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.ioobstackall versions0.1.4cargo update -p obstack --precise 0.1.4

Affected Products

1 product · 1 configurations
Application
obstackobstack_project
< 0.1.4
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 obstack, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update obstack to 0.1.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-35894 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 obstack crate before 0.1.4 for Rust. Unaligned references can occur.
O3 Security · Impact-Aware SCA

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CVE-2020-35894: obstack — Fixed in 0.1.4