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Vulnerability record · CVE-2020-36323 · published 14 April 2021

CVE-2020-36323: Rust-lang rust vulnerability

Rust Lang · Rust

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.

8.2 CVSS 3.1 High EPSS 2.0% · top 19.8% CWE-134 · CWE-134
8.2CVSS 3.1 base score, v2 6.4
2.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/rust-lang/rust/issues/80335 PatchThird Party Advisory
https://github.com/rust-lang/rust/pull/81728 PatchThird Party Advisory
https://github.com/rust-lang/rust/pull/81728#issuecomment-821549174 PatchThird Party Advisory
https://github.com/rust-lang/rust/pull/81728#issuecomment-824904190 PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CZ337CM4GFJLRDFVQCGC7J2
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFUO3URYCO73D2Q4WYJBWAM
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZG65GUW6Z2CYOQHF7T3TB5
https://github.com/rust-lang/rust/issues/80335 PatchThird Party Advisory
https://github.com/rust-lang/rust/pull/81728 PatchThird Party Advisory
https://github.com/rust-lang/rust/pull/81728#issuecomment-821549174 PatchThird Party Advisory
https://github.com/rust-lang/rust/pull/81728#issuecomment-824904190 PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CZ337CM4GFJLRDFVQCGC7J2
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFUO3URYCO73D2Q4WYJBWAM
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZG65GUW6Z2CYOQHF7T3TB5

Track CVE-2020-36323 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2020-36323), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.