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Vulnerability record · CVE-2021-28875 · published 11 April 2021

CVE-2021-28875: Rust-lang rust unchecked return value vulnerability

Rust Lang · Rust

In the standard library in Rust before 1.50.0, read_to_end() does not validate the return value from Read in an unsafe context. This bug could lead to a buffer overflow.

7.5 CVSS 3.1 High EPSS 2.1% · top 18.9% CWE-252 · Unchecked return value
7.5CVSS 3.1 base score, v2 5.0
2.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

In the standard library in Rust before 1.50.0, read_to_end() does not validate the return value from Read in an unsafe context. This bug could lead to a buffer overflow.

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/80894 ExploitIssue TrackingPatchThird Party Advisory
https://github.com/rust-lang/rust/pull/80895 PatchThird Party Advisory
https://security.gentoo.org/glsa/202210-09 Third Party Advisory
https://github.com/rust-lang/rust/issues/80894 ExploitIssue TrackingPatchThird Party Advisory
https://github.com/rust-lang/rust/pull/80895 PatchThird Party Advisory
https://security.gentoo.org/glsa/202210-09 Third 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-2021-28875), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.