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HIGH severity

CVE-2021-29929 — endian_trait

HIGH

CVE-2021-29929 is a high-severity (CVSS 7.5) CWE-415 vulnerability in endian_trait. 1 public exploit reference exists, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

Double free in endian_trait

Also known asRUSTSEC-2021-0039
Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Oct 10, 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 CVEs66th percentile — riskier than 66% of all scored CVEsHighest risk
0.00%0.55%1.09%1.64%0.4%1.1%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2021-29929 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
🦀endian_trait

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 endian_trait crate through 2021-01-04 for Rust. A double drop can occur when a user-provided Endian impl panics.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
🦀crates.ioendian_traitall versionsNo fix

Affected Products

1 product · 1 configurations
Application
endian traitendian_trait_project
≤ 2021-01-04
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

An issue was discovered in the endian_trait crate through 2021-01-04 for…

rustsec.orgNVDApr 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Remediation status

    No patched version of endian_trait has shipped for CVE-2021-29929 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 endian_trait crate through 2021-01-04 for Rust. A double drop can occur when a user-provided Endian impl panics.
O3 Security · Impact-Aware SCA

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CVE-2021-29929: endian_trait (High 7.5)