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Not in CISA KEV
MEDIUM severity

`net2` invalidly assumes the memory layout of std::net::SocketAddrGHSA-c79c-gwph-gqfm

MEDIUM

GHSA-c79c-gwph-gqfm is a medium-severity (CVSS 5.5) vulnerability in net2. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for net2 — see the affected versions and patch details below.

Also known asCVE-2020-35919CVE-2020-35920GHSA-458v-4hrf-g3m4RUSTSEC-2020-0078RUSTSEC-2020-0079
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs34th percentile — riskier than 34% of all scored CVEsHighest risk
0.00%0.30%0.59%0.89%0.1%0.4%May 26Sep 26Nov 26

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

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🦀net2

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

The net2 crate has assumed std::net::SocketAddrV4 and std::net::SocketAddrV6 have the same memory layout as the system C representation sockaddr. It has simply casted the pointers to convert the socket addresses to the system representation. The standard library does not say anything about the memory layout, and this will cause invalid memory access if the standard library changes the implementation. No warnings or errors will be emitted once the change happens.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.ionet2all versions0.2.36cargo update -p net2 --precise 0.2.36

Affected Products

1 product · 1 configurations
Application
net2net2_project
< 0.2.36
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 net2 crate before 0.2.36 for Rust. It has…

rustsec.orgNVDJan 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 net2, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update net2 to 0.2.36 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-c79c-gwph-gqfm 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

The net2 crate has assumed std::net::SocketAddrV4 and std::net::SocketAddrV6 have the same memory layout as the system C representation sockaddr. It has simply casted the pointers to convert the socket addresses to the system representation. The standard library does not say anything about the memory layout, and this will cause invalid memory access if the standard library changes the implementation. No warnings or errors will be emitted once the change happens.
O3 Security · Impact-Aware SCA

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