CVE-2020-36323

rust: optimization for joining strings can cause uninitialized bytes to be exposed

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Severity

Moderate

Red Hat Product Security

8.2

CVSS 3.1

Review impact separately from score.

Published · December 23, 2020

Updated · August 9, 2026

Description

In the standard library in Rust before 1.52.0, there is an optimization for joining strings that can cause uninitialized bytes to be exposed (or the program to crash) if the borrowed string changes after its length is checked.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 8.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CWE-20 · Improper Input Validation