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Vulnerability record · CVE-2020-36317 · published 11 April 2021

CVE-2020-36317: Rust-lang rust out-of-bounds write vulnerability

Rust Lang · Rust

In the standard library in Rust before 1.49.0, String::retain() function has a panic safety problem. It allows creation of a non-UTF-8 Rust string when the provided closure panics. This bug could result in a memory safety violation when other string APIs assume that UTF-8 encoding is used on the same string.

7.5 CVSS 3.1 High EPSS 1.5% · top 26.8% CWE-787 · Out-of-bounds write
7.5CVSS 3.1 base score, v2 5.0
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

In the standard library in Rust before 1.49.0, String::retain() function has a panic safety problem. It allows creation of a non-UTF-8 Rust string when the provided closure panics. This bug could result in a memory safety violation when other string APIs assume that UTF-8 encoding is used on the same string.

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

Affected products

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

References

LinkTags
https://github.com/rust-lang/rust/issues/78498 ExploitIssue TrackingThird Party Advisory
https://github.com/rust-lang/rust/pull/78499 PatchThird Party Advisory
https://github.com/rust-lang/rust/issues/78498 ExploitIssue TrackingThird Party Advisory
https://github.com/rust-lang/rust/pull/78499 PatchThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-36317), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.