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CVE-2020-35926

28
FAUCET Score

CVE-2020-35926 is a critical vulnerability affecting the nanorand crate for Rust, specifically versions prior to 0.5.1. The flaw, stemming from mishandled integer truncation, causes all random number generators within the crate to produce only zeroes, severely compromising cryptographic integrity. With a CVSS score of 9.8 (Critical), this vulnerability is easily exploitable over the network with no user interaction, leading to complete compromise of confidentiality, integrity, and availability. While no active exploitation, public exploit code, or significant community discussion has been observed, the fundamental nature of the flaw poses a significant risk to applications relying on nanorand for randomness.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.5.1CPE matchmatch criteria
cpe:2.3:a:nanorand_project:nanorand:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.52%
Probability of exploitation in next 30 days
EPSS Percentile
71.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0152 is in the 59th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: nanorandFixed in: 0.5.1

Vendor Advisories (1)

rustGHSA-m9m5-cg5h-r582medium

Improper random number generation in nanorand

Aug 25, 2021

References

rustsec.org / advisories/RUSTSEC-2020-0089.html
Third Party Advisory