CVE-2020-36317

String::retain allows safely creating invalid strings when abusing panic

Reported

October 28, 2020

Issued

April 13, 2021

Package

std

Type

Vulnerability

Categories

memory-corruption

References

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36317

Patched

>=1.49.0

Unaffected

<1.26.0

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.

Advisory available under CC0-1.0 license.